Cabling Guide for Console and AUX Ports

Introduction This document summarizes the cabling requirements for console and auxiliary (AUX) ports. Cisco routers either have RJ-45-based or DB-25 DCE/DTE console and AUX ports. You can connect either a terminal (DTE) or a modem (DCE) to these ports. In either instance, you need both an RJ-45 cable and an RJ-45-to-DB-25 or RJ-45-to-DB-9 connector. Prerequisites Requirements There are no specific requirements for this document. Components Used This document is not restricted to specific software and hardware versions. Conventions Refer to Cisco Technical Tips Conventions for more information on document conventions. Table of Routers with Console and AUX Ports The table in this section lists the Cisco router series and the corresponding console and AUX ports. Router Console Port Console Port Cable AUX Port AUX Port Cable 600 RJ-45 (management port) RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A 700 RJ-45 RJ-45 Rolled N/A N/A 800 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A 1000 RJ-45 RJ-45 Rolled N/A N/A 1600 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female N/A N/A 1700 RJ-45 RJ-45 Rolled / RJ-45 to DB-9 Female RJ-45 RJ-45 Rolled 2500 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled 2600 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled 3600 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled MC3810 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled 4000 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled AS5200/5300 RJ45 RJ-45 Rolled RJ-45 RJ-45 Rolled AS5400 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled AS5800 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled 7100/7200/7300 RJ-45 RJ-45 Rolled RJ-45 RJ-45 Rolled 7200 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled 7500 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled 12000 DB-25 DCE RS 232 / RJ-45 Rolled DB-25 DTE RS 232 / RJ-45 Rolled Console Port Settings for Terminal Connection Before you connect a terminal to the console port, configure the terminal to match the router console port as shown here: 9600 baud 8 data bits no parity 2 stop bits (9600 8N2) OR 1 stop bit¹ ¹Dependant on the router. Types of Console and AUX Connectors Cisco routers have three types of console and AUX connectors. The table in this section lists these types: RJ-45 DB-25 DCE DB-25 DTE There are three styles of RJ-45-to-DB-25 connectors: DCE style (modem) DTE style DCE style (non modem) Each of these styles has a different role. Generally, DTE is for terminals, DCE (modem) is for modems, and DCE (non-modem) is obsolete. Note: Move pin 6 to pin 8 if you want to change a DCE style (non modem) to a DCE style (modem). Console and AUX Connectors for Cisco Routers Connector Graphic RJ-45 DB-25 DCE DB-25 DTE Cabling for console and AUX port: RJ-45 Cables RS 232 Straight-through Cable Types of RJ-45 Cabling Cisco products use these types of RJ-45 cables: Straight-through Crossover Rolled RJ-45 to DB9 female Cisco does not provide these cables. These cables are widely available from other sources. Console cable is usually provided with the Console Cable Kit. Note: The console port does not support modem control or hardware flow control. How to Identify an RJ-45 Cable In order to identify the RJ-45 cable type, hold the two ends of the cable next to one another so you can see the colored wires inside the ends, as shown here: 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. Examine the sequence of colored wires to determine the type of RJ-45 cable. This section explains how you can do this. Straight-through Cable In a straight-through cable, the colored wires are in the same sequence at both ends of the cable. Straight-through Cable RJ-45 Straight-through (Ethernet) Cable Pin-outs Signal RJ-45 Pin RJ-45 Pin Signal Tx+ 1 1 Tx+ Tx�C 2 2 Tx�C Rx+ 3 3 Rx+ �C 4 4 �C �C 5 5 �C Rx�C 6 6 Rx�C �C 7 7 �C �C 8 8 �C Crossover Cable 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. Crossover Cable RJ-45 Crossover (Ethernet) Cable Pin-outs Signal RJ-45 Pin RJ-45 Pin Signal Tx+ 1 3 Rx+ Tx�C 2 6 Rx�C Rx+ 3 1 Tx+ �C 4 4 �C �C 5 5 �C Rx�C 6 2 Tx�C �C 7 7 �C �C 8 8 �C 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. Rolled Cable Rolled Cable Pinouts Signal RJ-45 Pin RJ-45 Pin Signal �C 1 8 �C �C 2 7 �C �C 3 6 �C �C 4 5 �C �C 5 4 �C �C 6 3 �C �C 7 2 �C �C 8 1 �C 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. RJ-45 to DB-9 Female* This cable is also known as Management Cable. *Cisco provides this cable with the 600, 800, 1600 and 1700 Series Routers. Type of Cable for DB-25 Connectors RS 232 Straight-through Cable This illustration shows serial cable CAB-R23= (part number 74-0173), which is a general serial cable for all router platforms: Both Ends of RS 232 Straight-through Cable for DB-25 Connectors This cable has a female DB-25 connector on one end and a male DB-25 connector on the other end. Either end of the CAB-R23 cable can be the Cisco end or the network end, depending on whether the Cisco router is designated as a DCE device or a DTE device. If the router is designated as a DCE device, the female DB-25 connector is the Cisco end. If the router is designated as a DTE device, the male DB-25 connector is the Cisco end. Pin-outs for RS 232 Straight Through Cable (DB-25) Male DTE Pin-outs Female DTE Pin-outs 25 Pin Signal 25 Pin Signal �C �C     J2-1 Shield GND J2-1 Shield GND J2-2 Shield TxD �C J2-2 Shield TxD �C J2-3 Shield RxD �C J2-3 Shield RxD �C J2-4 Shield RTS �C J2-4 Shield RTS �C J2-5 Shield CTS �C J2-5 Shield CTS �C J2-6 Shield DSR �C J2-6 Shield DSR �C J2-7 Shield Circuit GND �C J2-7 Shield Circuit GND J2-8 Shield DCD �C J2-8 Shield DCD �C J2-15 Shield TxC �C J2-15 Shield TxC �C J2-17 Shield RxC �C J2-17 Shield RxC �C J2-18 Shield LTST �C J2-18 Shield LTST �C J2-20 Shield DTR �C J2-20 Shield DTR �C J2-24 Shield TxCE �C J2-24 Shield TxCE �C Adapters You need two types of adapters to connect a PC to a router. RJ-45-to-DB-9 Adapter RJ-45-to-DB-25 Adapter RJ-45-to-DB-9 Adapter This adapter connects a router to a PC though a COM port. RJ-45-to-DB-9 Adapter RJ-45-to-DB-25 Adapter This adapter connects a router to PC through a serial port. RJ-45-to-DB-25 Adapter Cabling and Adapter Setups that Work Here are the most common ways to console into a router. Console Connection Combination Console Port Cable Adapter for PC Adapter for Console Port RJ-45 RJ-45 Rolled DB-9 / DB-25 None DB-25 DCE RJ-45 Rolled DB-9 / DB-25 RJ-45-to-DB-25 DB-25 DCE DB-25 None None RJ-45 RJ-45-to-DB-9¹ None None ¹ Cisco provides this cable with the Cisco 600, 800, 1600 and 1700 Series Routers. 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 These are the only setups that work. If you do not have the components you need, use the RJ-45 Component Guide chart to order them. RJ-45 Port and Adapter Pin-outs This chart shows the pin-outs for RJ-45 console and AUX ports. The console port does not use RTS/CTS. RJ-45 Port Pin-outs Signal Console Port (DTE) RJ-45 Rolled Cable Adapter Adapter Signal   RJ-45 RJ-45 Pin DB-9 Pin DB-25 Pin   CTS 1 8 7 4 RTS DTR 2 7 4 20 DSR TxD 3 6 3 2 RxD GND 4 5 5 7 GND GND 5 4 5 7 GND RxD 6 3 2 3 TxD DSR 7 2 6 8 DTR RTS 8 1 8 5 CTS DB-25 Console and AUX Port Pin-outs Console Port Signals Pin Signal Direction Description 1 GND �C Ground 2 TxD <-- Transmit Data 3 RxD --> Receive Data 6 DSR --> Data Set Ready (always on) 7 GND �C Ground 8 DCD --> Data Carrier Detect (always on) Note: The console port does not support modem control or hardware flow control. Auxiliary Port Signals Pin Signal Direction Description 2 TxD --> Transmit Data 3 RxD <-- Receive Data 4 RTS --> Request To Send (used for hardware control) 5 CTS <-- Clear To Send (used for hardware flow control) 6 DSR <-- Data Set Ready 7 Signal Ground �C Carrier Detect (used for modem control) 8 CD <-- Data Terminal Ready (used for modem control only) 20 DTR -->   Note: The auxiliary port supports hardware flow control and modem control. Console Cable Kit A console cable kit is provided with your router. Use this kit when you connect your router to a PC or a terminal. The console cable kit contains these items: RJ-45-to-RJ-45 console cable (blue) RJ-45-to-DB-25 adapter (gray) RJ-45-to-DB-9 adapter (gray) Note: The Cisco 7200 Series and Cisco 7301 are not shipped by default with a console cable kit. If a console cable is required, order an accessory kit (part number: ACS-2500ASYN). RJ-45-to-RJ-45 console cable RJ-45-to-DB-25 adapter RJ-45-to-DB-9 adapter Cisco RJ-45 Component Guide This chart summarizes the RJ-45 components of Cisco: RJ-45 Component Guide Style Catalog Part Number Catalog Description Label Shielded? DTE CAB-500DTF= DB-25 CONNECTOR, DTE FEMALE 29-0810-01/29-DTF-01 no DTE CAB-500DTM= DB-25 CONNECTOR, DTE MALE   no modem CAB-25AS-MMOD= CABLE CONN-MODEM TO RJ45 SHLD   yes modem CAB-MMOD= ADP,RJ45/DSUB 29-0881-01/29-MMOD-01 no DCE CAB-500DCF= DB-25 CONNECTOR, (non modem) DCE FEMALE 29-0809-01/29-DCF-01 no DCE CAB-500DCM= DB-25 CONNECTOR,(non modem) DCE MALE 29-0808-01/29-DCM-0129- 0808-01/29-DCM-01 no NA Rolled Cable CABASY,RJ45 ROLLED, MODULAR 72-0876-01/CAB-500RJ NA NA Straight Cable �Cnot in catalog�C 31-0756-01 NA Cable for DB-25/DB-9 Connection NA Depends on the router* RJ-45 to DB-9 female an all in one cable 72-3383-01 NA NA CAB-R23= RS 232 Straight-through Cable �C NA NA Depends on the router* DB-9 Male to DB-25 male for Modem connection 29-4043-01 NA The first seven entries are DB-25 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.

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