Links:
Cisco Serial Cable Part Numbers
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Mode Signaling Gender Part Number
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DCE EIA/TIA-232 F CAB-SS-232FC
DTE EIA/TIA-232 M CAB-SS-232MT
DCE EIA/TIA-449 F CAB-SS-449FC
DTE EIA/TIA-449 M CAB-SS-449MT
DCE EIA/TIA-530 F CAB-SS-530FC
DTE EIA/TIA-530 M CAB-SS-530MT
DCE EIA/TIA-530A F CAB-SS-530AFC
DTE EIA/TIA-530A M CAB-SS-530AMT
DCE X.21 F CAB-SS-X21FC
DTE X.21 M CAB-SS-X21MT
DCE V.35 F CAB-SS-V35FC
DTE V.35 F CAB-SS-V35FT
DCE V.35 M CAB-SS-V35MC
DTE V.35 M CAB-SS-V35MT
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Cisco 2500 Cables
CON RJ45 - RJ45 Rolled Cable
AUX RJ45 - RJ45 Rolled Cable
9600 8N1
9600 8N2
The console port does not support modem control or hardware flow control.
RJ-45 to DB-9 Female - This cable is also known as a Management Cable.
PC -> RJ-45 to DB-9 Adapter -> RJ-45 Rolled Cable -> Cisco COM
There are three types of commonly used RJ-45 cabling: straight, cross and
rolled. Hold the two ends of an RJ-45 cable side by side. There are eight
colored strips, or pins, at each end. If the order of the colored pins is
the same at each end, the cable is straight. If the order of the colors is
reversed at each end, the cable is rolled.
Move pin 6 to pin 8 if you want to change a DCE style (non modem) to a DCE
style (modem).
You cannot mix and match these components randomly. Here are the combinations
that work: Console Connection Combination:
Port RJ-45 Cable DB-25 Adapter To Attach
AUX / Console Straight DCE non-modem TERMINAL
AUX / Console Rolled DTE TERMINAL
AUX / Console Rolled DCE modem MODEM
AUX / Console RJ-45-to-DB9 None TERMINAL
CAB-OCTAL-ASYNC, the 8-port RJ-45 adapter that is used with the Cisco 2509,
2510, 2511, and 2512, is the same as a rolled cable.
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Serial
DTE or DCE?
There are two types of devices that can communicate over a serial interface:
DCE and DTE. A DCE provides a physical connection to a network and forwards
traffic. A DTE connects to a network through a DCE device. Typically, a DTE
device is connected to a DCE device (or vice versa) rather than another DTE
device.
Devices that communicate over a serial interface are divided into two classes:
DTE and DCE. The most important difference between these types of devices is
that the DCE device supplies the clock signal that paces the communications on
the bus. The documentation provided with the device should indicate whether it
is DTE or DCE (some devices have a jumper to select either mode).
A DTE device typically has a male connector, while a DCE device typically has
a female connector. Examine the serial connector on your serial device to
determine its gender.
The Cisco 805 router which is a DTE device by default, is connected to a
CSU/DSU or modem, which are DCE devices.
dte -> V.35 DTE cable -> dce device (provides clocking)
cisco -> V.35 DTE cable -> csu/dsu
The CSU/DSU or modem and its serial connector have the following
characteristics:
• DCE device
• V.35
• Female
Because the serial devices are DCE, you should use a DTE cable to connect the
router and the CSU/DSU or modem. Given these characteristics, the appropriate
serial cable to connect the router and the CSU/DSU or modem is a DTE V.35 male
cable.
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Console
There are three types of commonly used RJ-45 cabling: straight, cross and
rolled. Hold the two ends of an RJ-45 cable side by side. There are eight
colored strips, or pins, at each end. If the order of the colored pins is the
same at each end, the cable is straight. If the order of the colors is reversed
at each end, the cable is rolled.
Straight-through Cable
In a straight-through cable, the colored wires are in the same sequence at both
ends of the cable.
Crossover Cable (also called "null-modem")
In a crossover cable, the first (far left) colored wire at one end of the cable
is the third colored wire at the other end of the cable.
Rolled Cable
In a rolled cable, the colored wires at one end of the cable are in the reverse
sequence of the colored wires at the other end of the cable.
Plug Types:
RJ-45, DB-9, and DB-25, AUI (DB-15)
Cisco 2500 (RJ-45 Female) -> PC - crossover cable
Cisco 7000 (DB-25 Male) -> PC - straight cable
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WAN Interfaces - serial, isdn, atm
Serial interfaces are normally presented as DB60 female interfaces.
ISDN is presented as RJ45.
ATM can be presented in quite a few different formats.
TIP: ATM should really only be considered for the CCIE lab preparation;
The most common -- and usable -- WAN interface is a DB60 serial interface. You
can very simply cable this interface for a "back-to-back" WAN connection, the
building block of every lab you will use. To do this, use a serial crossover
cable that is one side a DTE and one side a DCE, then connect then two routers
over their retrospective Serial Interfaces.
TIP: You can also carry out frame relay (essential for the CCIE!) using
this back-to-back connection. Alternatively, you can look for a
router with four or more Serial interfaces and use it as a frame
relay switch, then connect the other routers to this using their
serial interfaces.
Most Cisco routers are equipped with one or more LAN ports and serial
connections. Normally, the serial ports go to DSU/CSU (Data and Channel
Service Units), which in turn connect service provider wan links.
Connecting two Cisco routers via serial interfaces for a home lab are done with
a "back to back cable assembly." To connect serial interfaces, you need a DCE
cable on one router and a DTE on another. The most common serial router cables
are equipped with V.35 connectors -- female for DCE, and male for DTE. The
routers themselves have one of two kinds of female jacks for serial interfaces
-- a mini-DB60 on the new models and a larger, DB50 jack on the older models.
One important note on connecting routers via back-to-back cables: At least one
router must support clocking (DCE) -- the IOS "clockrate" command. The 2500,
3104, and 4000 serial interfaces do, but some older 3000 and IGS models don't.
There are two types of ISDN. These are primary rate ISDN (PRI) and basic rate
IDSN (BRI). BRI is what is tested at the CCNA, CCNP and CCIE (R&S) level.
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LAN Interfaces
Ethernet:
AUI (DB-15)
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Cisco Serial Port FAQ (Crossover | DCE/DTE Back-to-Back Cable)
Can I connect my routers back to back?
Yes you can. There are a couple of ways to do this. With two routers you can
have them back-to-back with or without a T1 link. One way is purchase the
special cable that allows you to connect the routers together. A second way is
to get a serial to V.35 DTE and DCE cable set and connects the two V.35
connectors together. A third way is to make a T1 back-to-back cable and then
connect the two routers through the DSU/CSUs.
What are the Cisco cables for DTE to DCE back to back?
CAB-V35MT and CAB-V35FC (Cisco 2500 or other high density serial connectors).
High-Density DCE/DTE DB60 Cisco Crossover Cable:
Used to connect two cisco router via the synchronous serial ports.
This cable is a xFT V.35 DTE/DCE DB60-DB60 Crossover Back-to-Back Cable used to
connect Cisco 1600/1700/2500/2600/3600 (WIC-1T, NM-4A/S, NM-8A/S on the 2600 and
3600) Series routers via their serial ports to simulate Frame-Relay and other WAN
topologies.
If you are using a T1-WIC card, don't forget the following command:
interface s0
service-module t1 timeslots 1-24
What pins do I need to connect for a T1 loopback cable?
Using a RJ45 and looking from the connector side up, with the cable end point
towards yourself, count from left to right.
Pin 1 to 5
Pin 2 to 4
Pin 4 to 2
Pin 5 to 1
A useful troubleshooting aid is to make a single loopback connector, pins 1 -5
and 2-4 This will let you test the serial interface to the T1 interface
termination. This will let you bring up the T1 interface and test just as if
you had a Telco pull point-to-point circuit.
Can I make a 56K back-to-back cable?
Sure, construct the 56K crossover (back to back) cable by using pins 1-7, 2-8,
7-1, 8-1
Any other things I need to know about a 56K back to back?
You cannot use a clock rate of 64, cannot use switched-56 or use the clock rate
of auto on either side.
Can I emulate a frame relay connection without using the phone company?
Absolutely.. you need a third Cisco router with TWO serial ports. You also need
two back-to-back cables or 2 DTE and 2 DCE cables. The third router is configured
using the command:
! Cisco dual serial port router
!
frame-relay switching ; enable frame switch
!
interface serial 0/0
no ip address
encapsulation frame-relay ; sets encapsulation to frame relay
clockrate 38400 ; gens clock rate of 38400 to DTE
frame-relay lmi-type ansi ; sets ANSI type
frame-relay intf-type dce ; sets DCE or DTE
frame-relay route 100 interface serial 0/1 101
!;defines the PVC between ports S0/0 and S0/1
!
interface serial 0/1
no ip address
encapsulation frame-relay
clockrate 38400
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 101 interface serial 0/0 100
To connect two HSSI ports back to back, use a null modem cable, part number
[colorred]92-0727-01 and use the command: hssi internal-clock to turn on the
internal clocking. Don't forget to turn it off when you remove the back to
back cable.
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http://www.pacificcable.com/
http://www.pacificcable.com/CiscoCables.htm
http://www.pacificcable.com/VDotCables.htm
http://www.pacificcable.com/Picture_Page.asp?DataName=CAB-V35FC-10
CAB-V35FC-10 LFH 60 Male ( DB60 Male ) - V.35 Female DCE 10 Ft. $36.00
http://www.pacificcable.com/Picture_Page.asp?DataName=V35FF
This is a V.35 Style Female to V.35 Female Gender Changer. It changes a V.35
Male to a V.35 Female. It could also be used as a coupler between two V.35
Male cables.
CAB-232MT-10 LFH 60 Male ( DB60 Male ) - RS232 DB25 Male DTE 10 Ft. $32.00
M & S Plus Corp
Attn: Karen
P.O. Box 3008
San Dimas, CA 91773
http://www.symmic.com/computer/cabcisco.htm
Cisco Cross/Over Serial Cable 60pin M-M 6 FT. Great deal on a Cisco Cross/over
Serial Cable style HDB 60M to HDB 60M 6 FT. in length Router Cable. Router-to-
Router DB60 [DTE] / DB60 [DCE] protocol cable used to connect two Cisco routers
via the synchronous serial ports. Excellent for CCIE/CCNP/CCNA lab setup's.
Primary / Source connector: DB60 Male
Secondary/Device Connector: DB60 Male
Cable environment: Router
Cable style: Serial
Cisco Serial Crossover Cables DB60M-DB60M 6FT
$34.95 each