!!!Cabling Guide for RJ-45 Console and AUX Ports
(Cisco's 1000 series, 2500 series, and AS5100)
!!Introduction
This document will summarize the cabling requirements for Cisco RJ-45 console and AUX ports. Cisco's 1000 series, 2500 series, and AS5100 all have RJ-45-based console and AUX ports. You can connect either a terminal (DTE) or a modem (DCE) to these ports. Either way, you'll need two components, an RJ-45 cable and an RJ-45-to-DB25 connector.
!!Types of RJ-45 Cabling
There are two types of RJ-45 cabling, straight and rolled. If you hold the two ends of an RJ-45 cable side by side, you'll see eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, then the cable is straight. If the order of the colors is reversed at each end, then the cable is rolled.
The rolled cable (CAB-500RJ) is standard with Cisco's 2500/CS500.
Note: 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.
!!Styles of RJ-45-to-DB25 Connectors
There are three styles of RJ-45-to-DB25 connectors, DCE style (modem), DTE style, and DCE style (non modem). Each one has a different role. Generally, DTE is for terminals, DCE (modem) is for modems, and DCE (non-modem) is obsolete.
Note: You can change a DCE style (non modem) to a DCE style (modem) by moving pin 6 to pin 8.
Setups That Work
You can't mix and match these components randomly. Only the following combinations will work:
||PORT||[RJ-45] Cable||DB25 Cable||TO ATTACH STYLE||TO A:
|AUX/Console|Rolled|[DTE]|TERMINAL
|AUX/Console|Straight|[DCE]|non-modem|TERMINAL
|AUX/Console|Rolled|[DCE] modem|MODEM
These are the only setups that will work. If you don't have the components you need, use the chart below to order them.
Cisco's [RJ-45] Component Guide
This chart summarizes Cisco's [RJ-45] components. The first seven entries are DB25 connectors, and the last two are RJ-45 cables. Connectors are described in terms of their sex and their role. For example, an FDTE is a female DTE style connector, an MMOD is a male modem style connector, and so on. Remember, you need shielded cables in order to run at 115.2 Kbps.
{{{
STYLE CATALOG PART # CATALOG DESCRIPTION LABEL SHIELDED? -----
----- -------------- ------------------- ------------------- ---------
[DTE] CAB-25AS-FDTE= CABLE CONN-FTDTE 29-1026-01/TERMINAL yes
[DTE] CAB-500DTF= DB-25 CONNECTOR, 29-0810-01/29-DTF-01 no
[DTE] FEMALE
DTE CAB-500DTM= DB-25 CONNECTOR, 29-0811-01/29-DTM-01 no
[DTE] MALE
modem CAB-25AS-MMOD= CABLE CONN-MODEM 74-0458-01/MODEM yes
TO RJ45 SHLD
modem CAB-MMOD= ADP,RJ45/DSUB 29-0881-01/29-MMOD-01 no
DCE CAB-500DCF= DB-25 CONNECTOR, 29-0809-01/29-DCF-01 no
(non modem) [DCE] FEMALE
[DCE] CAB-500DCM= DB-25 CONNECTOR, 29-0808-01/29-DCM-01 no
(non modem) [DCE] MALE
NA Rolled Cable CABASY,RJ45 ROLLED, 72-0876-01/CAB-500RJ NA
MODULAR
NA Straight Cable -not in catalog- 31-0756-01 NA
RJ-45 Port Pinouts
This chart shows the pinouts for RJ-45 console and AUX ports. The console port does not use RTS/CTS.
Console/Auxiliary Port (DTE)
----------------------------
Pin Signal Input/Output
----------------------------
1 RTS Output
2 DTR Output
3 TXD Output
4 GND -
5 GND -
6 RXD Input
7 DSR Input
8 CTS Input
RJ-45 Adapter Pinouts
This chart shows the pinouts for RJ-45 adapters.
Cable
RJ-45 Pins DTE style DCE style DCE style
(modem) (non modem)
------------------------------------------------
1 4 5 5
2 20 8 6
3 2 3 3
4 7 7 7
5 7 7 7
6 3 2 2
7 6 20 20
8 5 4 4
This chart shows suggested DB-25 to DB-9 adapter pinouts, if you need a DB-9 connector.
DB-25 Pin Signal DB-9 Pin
-----------------------------
2 TXD 3
3 RXD 2
4 RTS 7
5 CTS 8
6 DSR 6
7 GND 5
8 DCD 1
20 DTR 4
}}}
[So where the heck is Pin 1]?
!! More Information
There might be more information for this subject on one of the following:
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