WEBVTT

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 This video is part of the Cisco Certified
 Technician routing and switching

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 curriculum. It falls within section
 4 of the blueprint and within that

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 blueprint I'm going to be talking specifically
 about the bullet point

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 connecting modems
 to console ports.

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 My name is Keith Bogart and I will be
 your instructor for this session.

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 So in this particular session I'm going
 to be covering two bullet points

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 within the section 4 blueprint
 of the CCTRS.

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 Specifically the two things I'm going
 to talk about are how to use modem

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 to connect to a Cisco console port as
 well as a phone line and configuring

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 the correct dip switch settings on the
 modem so that it works correctly.

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 So first of all what is a modem?

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 Modems are maybe it's a device you
 have never seen or heard before in

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 this day and 2017 modems really aren't
 used a lot or maybe when you think

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 of modem you think of cable
 modem or DSL modem.

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 A modem just the general term modem
 means modulate, demodulate.

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 What does that mean?

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 Well to modulate something is to take
 some form of data and convert it

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 into a different format.

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 For example let's say I have a message
 in my head which consists of you

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 know words that I want to convey to
 you but instead of speaking those

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 words I use a flashlight and we have
 an agreed-upon system that you know

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 like Morse code or something and I'm
 flicking the light on and off.

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 While I am modulating my message I'm
 taking the message in my head which

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 is composed of words in English and
 I'm converting that I'm modulating

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 that into something else which in this
 case is flickering light for you

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 to see. Demodulations is
 exactly the opposite.

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 You see the flickering light you look
 down at your you know piece of paper

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 that tells you how to convert that back
 into words modulate demodulate.

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 So in the terms of networking devices
 here for example when you're talking

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 about an analog modem which is what
 this is it's called an analog modem

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 the idea was okay the device like the
 computer that's connected to this

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 modem is going to be providing
 digital signals to the modem.

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 So it's going to be providing digital
 pulses of 1 0 1 0 in some sort of

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 some sort of voltage you know a certain
 voltage will be a 1 a certain

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 voltage will be a 0.

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 But in the old days your ultimate objective
 is to get your signal through

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 your phone line your telephone line
 to your service provider or somebody

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 else. Well that phone line wasn't specifically
 set up to transfer those

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 ones and zeros those binary messages
 via electrical signaling.

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 It did support electrical signaling
 but in a different way not ones and

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 zeros. So the original phone line what
 it was set up to do was as you

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 pick up your handset your phone you start
 talking into it the air pressure

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 of your voice would move a diaphragm
 within the phone which would wiggle

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 against a magnet which should create
 an oscillating set of electrical

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 energy. So the more you talk the more
 that magnet moved the greater the

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 the energy of the electrical signal
 the higher you talk or the lower you

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 talk your frequency would affect
 that electrical signal.

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 So actually what was going out from
 your phone onto the phone line was

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 electricity but that electricity was
 modulating it was going faster and

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 slower smaller and bigger it was a
 wide range of hearing someone with

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 you know the airwaves coming in and
 hitting their eardrum it was going

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 across electrically across that wire
 and then when it got to the other

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 phone at the other end it would make
 that magnet move within their handset

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 which would then convert it back into
 a speaker against the ear which

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 would pulsate you know air as if your
 voice was actually talking right

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 to them as if you were pulsating
 that air with your vocal cords.

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 So that same system was used to transfer
 data they said okay we're going

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 to take a modem connected to a laptop
 the ones and zeros coming out of

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 that laptop now we're going to have
 to convert it into the same type of

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 energy the same type of frequencies
 as if someone was talking and that's

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 why when you connect a modem one of
 the very very first things a modem

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 has to do when a modem is talking to
 another modem it both ends of a of

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 a wire both ends of a telephone connection
 is they have to negotiate what

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 frequencies are available because depending
 on the quality of the wire

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 depending on how far away they are certain
 frequencies can make it through

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 nice and strong other frequencies not
 so much for example on wires the

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 farther modems are apart from each other
 the really high frequencies become

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 degraded so when you're really close you
 can have a full range of frequencies

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 that can get back and forth nice and
 strong so when you turn on a modem

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 and one modem calls another you've probably
 heard that that typical sound

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 that that noise those are the two modems
 negotiating the frequency saying

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 okay here's a frequency do you hear this
 yes I do here's a lower frequency

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 do you hear this yes I do and so after
 that's done the modems know okay

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 now that I'm getting my ones and zeros
 in what frequencies can I modulate

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 that into that the other modem at the
 other end will be able to hear and

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 pick up and demodulate so that's what
 a modem was used for so you can

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 see here some of the earlier modems
 they look like you know what you see

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 here on the left so these are both examples
 of what we call us robotics

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 modems the one the left was an older
 modem okay so and the one the right

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 is a more recent modem so you know
 these days your laptop your PC may

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 have an internal modem built into it
 but a lot of them don't anymore you

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 know a lot of PC manufacturers recognize
 these days that people don't

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 use modems anymore they use their Wi
-Fi net card or their wired ethernet

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 jack either way that eventually connects
 to like a DSL modem or a cable

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 modem so if you actually want to connect
 to your phone line in your house

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 and have a modem connect your laptop
 to that phone line you either have

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 to have an internal modem built into
 your laptop or if you don't have

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 that you have to have one of these things
 we see here on the right something

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 to plug into your USB port which has
 a modem built into it so this little

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 thing right here on the right this
 white thing is actually a modem it

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 plugs into your USB port and then the
 other end of it connects to your

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 phone line and the one the left is a
 much larger scale modem with a lot

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 more options so how do you get one
 of these things well they're still

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 available i actually got both of these
 screenshots from amazon.com so

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 you can buy these still from amazon
.com or walmart target lots of places

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 sell these modems now in terms of the
 cct routing and switching why do

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 we care about modems well sometimes
 you'll have a piece of networking

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 gear we know that all routers and switches
 and even lots of other stuff

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 like content delivery engines and other
 things firewalls have console

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 ports right you got to have a console
 port to initially configure this

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 thing so what if i have a router switch
 i've got it configured i've got

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 it set up and now i have to ship it
 to some location where maybe that

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 location doesn't have any networking
 staff you know maybe i ship it there

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 maybe that location is fully staffed with
 like you know my marketing department

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 or my payroll department they don't
 know anything about connecting to

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 a router switch all they expect to do
 is receive this router switch and

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 i'll say okay go to this wiring closet
 on the door it's marked a1 open

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 that door and put this thing in there
 and connect this plug to this cable

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 they have no idea how to configure
 it troubleshoot it all they can do

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 is man handle it and physically what
 we call rack and stack it and that's

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 it now what happens if in the future
 i need to get into that device to

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 troubleshoot it or change the configuration
 well hopefully ip is configured

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 on that device and i can just tell that
 to it or i can ssh to it but what

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 if that fails what if my what if for some
 reason the the network interfaces

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 my ethernet ports or whatever on that
 device are non-functional it's lost

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 its ip address maybe it's lost its
 entire internet connectivity and i

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 cannot send ip packets to it so now i need
 to get into that thing in troubleshoot

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 why is that well normally the only way
 you could get into it if you couldn't

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 have ip connectivity is connecting to
 the console port but what if that

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 device is not located anywhere near you
 what if it's hundreds or thousands

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 of miles away from you and like i said
 it's in a location where there's

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 just nobody for you to call and walk through
 the process of troubleshooting

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 it and this particular case it would
 be useful to have a modem connected

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 to the console port and that modem
 connected to a functional telephone

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 line then at your location wherever
 you are you would have a modem like

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 the little one here on the right this
 one in white connected to your laptop

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 and from your modem you could call
 that remote modem and now you could

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 get remote access to the console port
 so that's what we're looking at

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 here in the cct routing and switching
 how do i set that up what do i need

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 to do to get that working okay so let's
 start now you can't just connect

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 a modem to the router's console port
 connect to it to a phone line and

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 walk away and expect it's going to
 work why not because modems must be

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 given initialization strings so they
 can communicate correctly to the

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 console port you see the modem needs
 to know certain things like okay

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 when a call comes in should the modem
 automatically pick it up or should

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 the modem just be their passive until
 you press a button to get the modem

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 to pick it up and a whole bunch of other
 stuff the modem has to be told

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 what to do now when you have a modem
 connected to your laptop you can

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 open up commands and i'll talk about
 that in just a second but you can't

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 do that when the modem is connected to
 the console port you see the console

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 port by definition is configured in such
 a way that you can send incoming

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 ASCII to that console port right you
 can send incoming ones and zeros

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 in that console port would take that
 in and then respond to what you type

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 but the console port does not allow to
 respond incoming ASCII but it can't

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 initiate outgoing ASCII sometimes we
 call that reverse telnet reverse

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 telnet is this idea of you know normal
 telnet is where you've got ASCII

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 you know you're everything you're typing
 on your keyboard wrapped inside

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 of an IP packet and then sent remotely
 over an IP connection reverse telnet

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 is this concept where i'm taking my serial
 port and i'm just sending ASCII

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 directly out of it so there's really
 no IP involved at all so you could

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 theoretically say that okay when i've
 got my serial port connected to

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 the console in a router when i open
 a piper terminal i am initiating a

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 reverse telnet connection from my laptop
 to the console port of the router

0:11:10.100000 --> 0:11:14.360000
 or switch but the reverse cannot be
 true if i'm on a router or switch

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 i port that which means if i connect
 to modem that console port and i

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 need to configure that modem with certain
 commands i'm stuck because there's

0:11:28.780000 --> 0:11:33.060000
 no way from within the router i can reverse
 telnet to that modem and enter

0:11:33.060000 --> 0:11:36.380000
 these initialization commands these
 initialization strings that it needs

0:11:36.380000 --> 0:11:40.020000
 so what's the moral of the story the
 moral of the story is number one

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 identify the modem that's going to connect
 to your console port but first

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 you got to connect it to your laptop
 you got to connect it to your pc

0:11:47.160000 --> 0:11:51.780000
 so you can program it and then you're
 going to connect it to the console

0:11:51.780000 --> 0:11:56.900000
 port when it's all ready to go okay
 so in order to do this we have to

0:11:56.900000 --> 0:11:59.940000
 understand a little bit about the cabling
 of the cabling that you because

0:11:59.940000 --> 0:12:03.040000
 there's a lot of different cables out
 there and we have to understand

0:12:03.040000 --> 0:12:13.620000
 what kind now if i go back here okay so
 clearly the vast majority of console

0:12:13.620000 --> 0:12:17.360000
 ports almost all of them not all of them
 but almost all of them on routers

0:12:17.360000 --> 0:12:22.780000
 and switches when you think of console
 ports are not usb ports right when

0:12:22.780000 --> 0:12:25.740000
 you think of a console port what type
 of form factor do you usually envision

0:12:25.740000 --> 0:12:33.360000
 an rj 45 jack right so this modem we
 have here on the right that's not

0:12:33.360000 --> 0:12:38.760000
 going to work because the the mail end
 of that modem is usb so we're going

0:12:38.760000 --> 0:12:49.500000
 to need to a connector that can connect
 to that rj 45 jack on the router

0:12:49.500000 --> 0:12:52.980000
 okay so what i'm going to focus in on
 right here is this cabling that's

0:12:52.980000 --> 0:12:56.080000
 in this red circle here we're going
 to look at what that cabling has to

0:12:56.080000 --> 0:13:00.420000
 look like and how to identify the correct
 cable you're going to use to

0:13:00.420000 --> 0:13:06.020000
 connect your laptop to that modem so
 you can configure it all right okay

0:13:06.020000 --> 0:13:09.400000
 so we're talking about what's called
 a serial cable here which is defined

0:13:09.400000 --> 0:13:13.260000
 in the rs 232 standard that's how a
 serial cable pin outs are defined

0:13:13.260000 --> 0:13:19.540000
 and what we need here the type of cable
 actually has two different terms

0:13:19.540000 --> 0:13:22.880000
 they both mean the same thing it just
 depends on which vendor you're talking

0:13:22.880000 --> 0:13:26.720000
 about so what you're looking at is
 getting what's called a modem cable

0:13:26.720000 --> 0:13:32.020000
 otherwise known as what you see here
 a straight through cable both terms

0:13:32.020000 --> 0:13:35.700000
 are the same thing a modem cable a
 straight through cable simply means

0:13:35.700000 --> 0:13:40.420000
 like you see right here pin three on
 one side goes to pin three on the

0:13:40.420000 --> 0:13:44.380000
 other pin two on one side goes to pin
 two you can see the pin out right

0:13:44.380000 --> 0:13:47.980000
 here that's why it's called straight
 through and this cable is designed

0:13:47.980000 --> 0:13:55.280000
 for a dte device to communicate with
 a dce device now you're might might

0:13:55.280000 --> 0:13:59.660000
 remember from some of my previous videos
 i defined what dte and dce is

0:13:59.660000 --> 0:14:07.080000
 but in this context your laptop or the
 router is the dte device the actual

0:14:07.080000 --> 0:14:12.780000
 physical modem that you purchase the us
 robotics modem that is a dce device

0:14:12.780000 --> 0:14:18.060000
 so because we're talking dte to dce we
 need a straight through cable otherwise

0:14:18.060000 --> 0:14:21.080000
 known as a modem cable and so here you
 can see the pin out so that's step

0:14:21.080000 --> 0:14:25.260000
 number one make sure that whatever
 cable you're using is labeled this

0:14:25.260000 --> 0:14:33.900000
 way and and try to verify the pin out
 if at all possible in that websites

0:14:33.900000 --> 0:14:37.120000
 and stuff about how to connect a modem
 to a console port and they actually

0:14:37.120000 --> 0:14:41.400000
 have that written up here's what they
 specify they say number one they

0:14:41.400000 --> 0:14:47.060000
 say every router switch that they sell
 comes in the box with a flat satin

0:14:47.060000 --> 0:14:51.700000
 blue rolled cable and i've shown that
 to you many times for example here

0:14:51.700000 --> 0:14:57.120000
 it is if i can actually disconnect this
 here here's an example of it right

0:14:57.120000 --> 0:15:03.000000
 this this blue satin cable right here
 in my case i've got a a usb to db9

0:15:03.000000 --> 0:15:06.120000
 connector on the end of it so it's not
 going to come with that you have

0:15:06.120000 --> 0:15:10.460000
 to purchase that that connector yourself
 um it's already plugged in so

0:15:10.460000 --> 0:15:15.140000
 on one size an rj 45 jack anyway you
 saw it in a previous video so that

0:15:15.140000 --> 0:15:21.220000
 comes with everything now that cable
 is a rolled cable it's not what we

0:15:21.220000 --> 0:15:25.680000
 see up here that cable pin one is going
 to pin eight pin two is going

0:15:25.680000 --> 0:15:29.640000
 to pin seven that's not what we need
 so we need to connect some sort of

0:15:29.640000 --> 0:15:34.300000
 adapter to that so we can take our rolled
 cable and turn it into a straight

0:15:34.300000 --> 0:15:37.880000
 through cable so we're basically going
 to connect an adapter that internally

0:15:37.880000 --> 0:15:43.020000
 rolls the pins again so we have one roll
 going to another roll which ends

0:15:43.020000 --> 0:15:46.340000
 up making it straight through so they
 say you should take that adapter

0:15:46.340000 --> 0:15:51.260000
 now here there's talking about uh a
 flat satin cable that is rj 45 on

0:15:51.260000 --> 0:15:56.400000
 both sides so it depends on what a
 router switch that cable will have

0:15:56.400000 --> 0:16:01.660000
 rj 45 connectors on both sides sometimes
 like in my case it's got a db9

0:16:01.660000 --> 0:16:05.960000
 connector on one side and an rj 45 connector
 on the other main thing to

0:16:05.960000 --> 0:16:10.180000
 remember internally within that cable
 it's rolled and that's not going

0:16:10.180000 --> 0:16:13.140000
 to work in its native format we have
 to turn it into this picture that

0:16:13.140000 --> 0:16:19.420000
 we see right here so they say if you
 get this rj 45 to rj 45 rolled cable

0:16:19.420000 --> 0:16:25.880000
 then you should connect what's called
 a terminal adapter which takes which

0:16:25.880000 --> 0:16:30.620000
 plugs into the rj 45 end of the cable
 and converts it into db9 at the

0:16:30.620000 --> 0:16:35.500000
 other end now a terminal adapter is simply
 straight through in other words

0:16:35.500000 --> 0:16:39.600000
 the internal pin out of that adapter
 is not rolling the pins it's not

0:16:39.600000 --> 0:16:43.320000
 changing the pins you know one is going
 to one two is going to two so

0:16:43.320000 --> 0:16:46.720000
 it's maintaining this rolled cable
 remember that blue cable is rolled

0:16:46.720000 --> 0:16:50.340000
 so if i attach a terminal adapter to
 it i'm just extending it basically

0:16:50.340000 --> 0:16:56.040000
 i'm just converting the end of it from
 rj 45 to db9 now why are they saying

0:16:56.040000 --> 0:17:00.040000
 attach it that way because this document
 was written a long time ago back

0:17:00.040000 --> 0:17:05.220000
 in the days when a lot of laptops and
 PCs actually had serial ports and

0:17:05.220000 --> 0:17:09.480000
 they had db9 serial ports you may have
 this look on the side or back of

0:17:09.480000 --> 0:17:14.340000
 your laptop or pc you may have a db9
 serial port but more and more laptops

0:17:14.340000 --> 0:17:18.120000
 and PCs these days aren't coming with
 those serial ports because they're

0:17:18.120000 --> 0:17:23.240000
 not used all heck of a lot anymore but
 if you do have a db9 serial port

0:17:23.240000 --> 0:17:28.240000
 and this cable is rj 45 on both ends
 one end would have to be connected

0:17:28.240000 --> 0:17:34.080000
 to db9 so that's where you'd use this
 uh this adapter here and then now

0:17:34.080000 --> 0:17:37.500000
 we still have this situation where
 we have a db9 connecting the cable

0:17:37.500000 --> 0:17:41.460000
 and the cable still essentially being
 rolled inside so we have to unroll

0:17:41.460000 --> 0:17:49.500000
 it again so here we take a db25 to rj
 45 modem adapter was a modem adapter

0:17:49.500000 --> 0:17:53.080000
 do it's just the opposite of a terminal
 adapter a modem adapter actually

0:17:53.080000 --> 0:17:58.840000
 rolls the cable inside so because we've
 already got a rolled cable now

0:17:58.840000 --> 0:18:01.940000
 we're attaching it to the adapter on
 that rolls it again we essentially

0:18:01.940000 --> 0:18:06.660000
 are getting straight through end to end
 so here's kind of what that looks

0:18:06.660000 --> 0:18:10.320000
 like if you want to visualize it graphically
 number one we've got our

0:18:10.320000 --> 0:18:15.320000
 modem and notice that modem has got
 a db25 connector on one end of it

0:18:15.320000 --> 0:18:18.560000
 so this is your db25 connector that's
 going to connect to either the console

0:18:18.560000 --> 0:18:22.760000
 port of the router or it's going to
 connect to your laptop now in this

0:18:22.760000 --> 0:18:26.780000
 case we're going to take that modem connector
 all right now remember inside

0:18:26.780000 --> 0:18:31.380000
 there that's rolling the pins then
 we're going to connect that to that

0:18:31.380000 --> 0:18:36.440000
 flat satin blue cable that Cisco's
 talking about then on the other end

0:18:36.440000 --> 0:18:40.720000
 of that cable we're going to connect
 that to an rj 45 to db9 terminal

0:18:40.720000 --> 0:18:44.580000
 adapter remember the terminal adapter
 maintains the pin outs it doesn't

0:18:44.580000 --> 0:18:49.540000
 roll or cross anything over and then
 lastly we're going to take that and

0:18:49.540000 --> 0:18:53.160000
 assuming that you've got a usb port on
 your laptop per pc which you probably

0:18:53.160000 --> 0:18:58.340000
 do you would then take that db9 and
 connect it to a db9 to usb adapter

0:18:58.340000 --> 0:19:06.000000
 and plug that in to your laptop or
 alternatively maybe when Cisco sent

0:19:06.000000 --> 0:19:11.440000
 you the router switch you did not get
 a rolled cable that was rg 45 on

0:19:11.440000 --> 0:19:14.520000
 both ends so in that case you can take
 those two pictures in the middle

0:19:14.520000 --> 0:19:18.940000
 and swap them out for that remember
 that's still a rolled cable and we

0:19:18.940000 --> 0:19:22.540000
 need straight through so we still need
 the adapters on on both ends here

0:19:22.540000 --> 0:19:26.980000
 so that's how you would connect the
 cabling to ultimately connect that

0:19:26.980000 --> 0:19:34.240000
 modem to your pc also when we get around
 to connecting the modem to the

0:19:34.240000 --> 0:19:40.460000
 console port same idea same idea is
 going to be true here because the

0:19:40.460000 --> 0:19:46.940000
 console port the router is a dte the
 modem is dce so we need a straight

0:19:46.940000 --> 0:19:51.080000
 through cable and because this blue
 cable is rolled we'll have to do the

0:19:51.080000 --> 0:19:56.000000
 same thing to connect it or you can buy
 sometimes cables that are straight

0:19:56.000000 --> 0:19:59.820000
 through anyway and you can skip all
 these adapters and stuff here now

0:19:59.820000 --> 0:20:03.000000
 so that's the physical cabling so let's
 just assume you've done that the

0:20:03.000000 --> 0:20:08.600000
 modem is now connected to your laptop
 so what do we have to do next well

0:20:08.600000 --> 0:20:11.120000
 you have to understand that these modems
 come with dip switches on the

0:20:11.120000 --> 0:20:16.880000
 back sort of looks like this if this
 is a brand new factory set modem

0:20:16.880000 --> 0:20:20.160000
 these dip switches should be set to
 factory defaults but you want just

0:20:20.160000 --> 0:20:24.800000
 want to make sure that to be certain
 now here's where you got to be a

0:20:24.800000 --> 0:20:29.380000
 little bit careful um because different
 modems dip switches are a little

0:20:29.380000 --> 0:20:33.320000
 bit different for example if you look
 at Cisco's documentation on this

0:20:33.320000 --> 0:20:36.140000
 connecting a modem to a console port
 it actually talks about dip switches

0:20:36.140000 --> 0:20:48.960000
 in there it says the dip switches one
 three and eight should all be one

0:20:48.960000 --> 0:20:52.000000
 three and eight right this picture is
 showing three five and eight being

0:20:52.000000 --> 0:20:55.660000
 down and all the other ones being up
 so what's the difference well this

0:20:55.660000 --> 0:21:02.000000
 picture is taken from a us from a uh a
 modarola modem and actually I believe

0:21:02.000000 --> 0:21:06.660000
 this is a us robotics modem either
 way the modem documentation that I

0:21:06.660000 --> 0:21:10.760000
 took this screenshot from said this is
 what you need to do to set to factory

0:21:10.760000 --> 0:21:15.400000
 default it says if it's factory default
 three five and eight should be

0:21:15.400000 --> 0:21:19.260000
 down and I actually include a screenshot
 here I'm not going to go through

0:21:19.260000 --> 0:21:22.540000
 all this stuff but showing you here
 what each one of those dip switches

0:21:22.540000 --> 0:21:29.640000
 controls um for example uh five right
 nose number five here five is is

0:21:29.640000 --> 0:21:35.000000
 down which means it's in the on position
 which means uh disable auto answer

0:21:35.000000 --> 0:21:38.220000
 well you're probably not going to want
 that I mean that's if this modem

0:21:38.220000 --> 0:21:41.720000
 is ultimately going to be connecting
 to a console port of a router you

0:21:41.720000 --> 0:21:44.960000
 probably will want it to auto answer
 when a call comes in and I'll show

0:21:44.960000 --> 0:21:48.480000
 you in just a second how we're going
 to change that via a command line

0:21:48.480000 --> 0:21:52.260000
 that we're going to issue to the modem
 as opposed to the dip switch but

0:21:52.260000 --> 0:21:55.460000
 what's the moral of the story the moral
 of the story is whatever modem

0:21:55.460000 --> 0:21:59.940000
 you buy make sure the dip switches
 are set in the default position if

0:21:59.940000 --> 0:22:05.440000
 you don't know what that is check the
 documentation for the modem all

0:22:05.440000 --> 0:22:11.040000
 right so that's the dip switch is there
 now for the purposes of the the

0:22:11.040000 --> 0:22:18.760000
 cctrs exam as with any exam right ccna,
 ccnp all the way up to the cci

0:22:18.760000 --> 0:22:24.220000
 sometimes there's some discrepancies
 between what you'll read in sisco

0:22:24.220000 --> 0:22:29.700000
 documentation or in a sisco book versus
 what your experience is in real

0:22:29.700000 --> 0:22:33.700000
 life like this case right sisco's documentation
 says as far as dip switches

0:22:33.700000 --> 0:22:38.520000
 are concerned one three and eight should
 be down all others should be

0:22:38.520000 --> 0:22:41.820000
 up and yet maybe your real life experience
 is hey I got this modem right

0:22:41.820000 --> 0:22:45.680000
 here and its documentation says something
 different if there's a discrepancy

0:22:45.680000 --> 0:22:49.380000
 remember what are you trying to achieve
 you're trying to pass a sisco

0:22:49.380000 --> 0:22:54.200000
 test so answer it the way sisco wants
 you to answer it so when it comes

0:22:54.200000 --> 0:22:57.680000
 to dip switches if you see a question
 about what's the default dip switch

0:22:57.680000 --> 0:23:01.440000
 setting don't argue in your head about
 well what if it's us robotics what

0:23:01.440000 --> 0:23:05.740000
 if it's motorola no sisco's answer
 would be one three and eight should

0:23:05.740000 --> 0:23:10.040000
 be down so that's what you should do but
 in real life check the documentation

0:23:10.040000 --> 0:23:17.400000
 okay so your modems connected to your
 laptop or your pc what are you gonna

0:23:17.400000 --> 0:23:20.960000
 do now okay so now you're gonna turn
 on your terminal emulation software

0:23:20.960000 --> 0:23:26.140000
 like secure CRT or putty or something and
 you're gonna establish a connection

0:23:26.140000 --> 0:23:29.840000
 over your serial line via your comport
 I already showed you how to do

0:23:29.840000 --> 0:23:32.260000
 that in a previous video when I was talking
 about how to connect directly

0:23:32.260000 --> 0:23:36.040000
 to the console port on a router you're
 gonna follow the exact same procedure

0:23:36.040000 --> 0:23:40.920000
 here except now what you're connecting
 to is the modem so instead of providing

0:23:40.920000 --> 0:23:45.020000
 uh sisco ios commands you're gonna provide
 what's called an initialization

0:23:45.020000 --> 0:23:51.160000
 string so this is actually taken from sisco's
 website this is their recommended

0:23:51.160000 --> 0:23:56.940000
 initialization string to set a modem
 back to its default settings and

0:23:56.940000 --> 0:24:00.740000
 turn on some other behaviors for example
 part of this initialization string

0:24:00.740000 --> 0:24:06.040000
 of all this goblico here is saying auto
 answer if a call comes in answer

0:24:06.040000 --> 0:24:09.200000
 it automatically so it's actually overriding
 that dip switch that we saw

0:24:09.200000 --> 0:24:14.100000
 in the previous modem so what is that
 i mean if you look at how you say

0:24:14.100000 --> 0:24:17.680000
 wow that is certainly not sisco ios what
 is that that's actually something

0:24:17.680000 --> 0:24:25.500000
 called the haze command set h a y e s
 haze it came from a guy named denis

0:24:25.500000 --> 0:24:31.920000
 haze back in 1981 he created a modem
 called the haze smart modem and order

0:24:31.920000 --> 0:24:35.800000
 to communicate with that modem he created
 this command set which is you

0:24:35.800000 --> 0:24:40.100000
 know character strings short text strings
 which are combined with numbers

0:24:40.100000 --> 0:24:43.940000
 and characters to send commands to the
 modem so that's what this is this

0:24:43.940000 --> 0:24:50.960000
 is the haze command set so you're gonna
 send this and what i would recommend

0:24:50.960000 --> 0:24:56.340000
 is if you send that you should get okay
 from the modem you should actually

0:24:56.340000 --> 0:25:00.080000
 see in hyper terminal or secures the
 rt okay which means it understood

0:25:00.080000 --> 0:25:06.160000
 all these commands at that point turn
 off the modem and connect it to

0:25:06.160000 --> 0:25:10.340000
 the console port now what if you don't
 get okay or what if you get some

0:25:10.340000 --> 0:25:14.260000
 other kind of error message here's
 the here's this thing to know about

0:25:14.260000 --> 0:25:18.880000
 the the haze command set in the original
 haze command set you would simply

0:25:18.880000 --> 0:25:23.640000
 have a capital letter or maybe two capital
 letters and that alone would

0:25:23.640000 --> 0:25:28.620000
 be a command for example at means attention
 that means wake up i'm about

0:25:28.620000 --> 0:25:33.080000
 to send you commands or you'd see a letter
 followed by a number for example

0:25:33.080000 --> 0:25:39.080000
 d one two three four five six seven
 means dial and here's a number that

0:25:39.080000 --> 0:25:45.000000
 was the original command set but that
 was back in 1981 over time as modems

0:25:45.000000 --> 0:25:48.360000
 got more and more complex and support
 more and more features different

0:25:48.360000 --> 0:25:51.940000
 vendors decide to add commands to this
 like their proprietary commands

0:25:51.940000 --> 0:25:57.700000
 which eventually got sort of rolled into
 the command set so a lot of these

0:25:57.700000 --> 0:26:00.460000
 commands here that all the commands
 you see that are prefaced with the

0:26:00.460000 --> 0:26:11.100000
 amper original haze command set that
 was added later on by some vendor

0:26:11.100000 --> 0:26:16.260000
 well it's possible because this is not
 standardized anywhere it's possible

0:26:16.260000 --> 0:26:22.060000
 that and f0 on one modem means something
 completely different on another

0:26:22.060000 --> 0:26:26.460000
 vendor's modem which could result in
 you typing this in and you don't

0:26:26.460000 --> 0:26:31.080000
 get okay or you get something else
 so what does that mean here's why i

0:26:31.080000 --> 0:26:35.880000
 would recommend this next slide here
 also taken from the siska website

0:26:35.880000 --> 0:26:39.980000
 breaks down everything that just was
 okay so that breaks down all those

0:26:39.980000 --> 0:26:44.600000
 things this is what you're trying to
 accomplish by typing in each one

0:26:44.600000 --> 0:26:51.260000
 of these haze or proprietary commands
 if you do not get an okay then go

0:26:51.260000 --> 0:27:04.180000
 to your modems documentation and look
 to dte speed look at that and b0

0:27:04.180000 --> 0:27:08.820000
 well maybe in your documentation floating
 dte speed is something completely

0:27:08.820000 --> 0:27:12.920000
 different so you'll want to swap out
 and be zero with whatever your modem

0:27:12.920000 --> 0:27:17.060000
 supports okay hopefully it'll take
 all this but i'm just saying if it

0:27:17.060000 --> 0:27:21.260000
 doesn't look for your documentation
 see if your modem supports commands

0:27:21.260000 --> 0:27:25.180000
 are a little bit different than these
 that accomplish the same thing all

0:27:25.180000 --> 0:27:29.840000
 right so you've done that you've gotten
 an okay disconnect the modem from

0:27:29.840000 --> 0:27:34.920000
 your laptop put it in the box with the
 router ship it to that office where

0:27:34.920000 --> 0:27:39.760000
 payroll or marketing is is sitting and
 say okay connect this router connect

0:27:39.760000 --> 0:27:43.160000
 this modem to the router here's a cable
 here's all the connectors already

0:27:43.160000 --> 0:27:46.420000
 slap those connectors on there so they
 don't have to figure it out and

0:27:46.420000 --> 0:27:49.420000
 then connect the modem to the phone
 line you know maybe you have them

0:27:49.420000 --> 0:27:52.180000
 plug in a phone first of all to make
 sure it gets a dial tone the phone

0:27:52.180000 --> 0:27:55.740000
 line's actually operational and good
 make sure you know what the number

0:27:55.740000 --> 0:27:58.960000
 is that goes to that phone line so
 you can call it now what do you do

0:27:58.960000 --> 0:28:02.100000
 at your end you take that little white
 modem that showed you or something

0:28:02.100000 --> 0:28:07.620000
 else connect that to your laptop connect
 the other end to the telephone

0:28:07.620000 --> 0:28:14.500000
 jack now you open up your terminal emulator
 and you issue a haze command

0:28:14.500000 --> 0:28:20.500000
 to call the remote modem for example
 at dt remember at is attention it

0:28:20.500000 --> 0:28:26.360000
 means wake up little modem d means dial
 in this case t means touch tone

0:28:26.360000 --> 0:28:33.140000
 so wake up dial this touch tone number
 of one 555 1234 and if everything's

0:28:33.140000 --> 0:28:36.780000
 working properly you'll hear the modem
 negotiate with the remote modem

0:28:36.780000 --> 0:28:40.800000
 all those sounds and then within like
 you know less than a minute hopefully

0:28:40.800000 --> 0:28:45.820000
 you'll get your iOS command prompt
 so that concludes this video on how