Console Port Connector And Cables - Cisco uBR905 Installation Manual

Console Port Connector and Cables

Both the standard straight-through and crossover Ethernet cables should be Category 5
Note
UTP (RJ-45) cables. Cisco does not supply Category 5 UTP cables; these cables are
available commercially.
Console Port Connector and Cables
The Cisco uBR905 router provides an RJ-45 serial connector for asynchronous serial console access.
The console port is a DCE device, so connecting it to another DTE device, such as the serial port on a
laptop PC, requires a straight-through DCE-to-DTE cable.
Table B-2 lists the pinouts for the console port and for the cabling required when connecting to a DTE
device that uses an RJ-45, DB-25, or DB-9 connector.
Table B-2
Signal
RTS
DTR
TxD
GND
GND
RxD
DSR
CTS
1. The console port does not support hardware flow control, so it does not support nor use the RTS and CTS
The console port is hardwired for 9600 baud, 8 data bits, no parity, 1 stop bit (9600 8N1) and does not
support either hardware or software flow control. If the console port is connected to a laptop computer
or other PC when the Cisco uBR905 is first powered-on, the initial system banner should be displayed
on the computer's console screen. If you do not see the system banner, verify that the laptop's serial port
is set correctly and that it is properly connected to the console port.
By default downloading a Cisco IOS configuration file disables the console port and
Note
erases all previously saved configurations. The Cisco uBR905 cable access router ships
from the factory with the console port enabled, and it remains enabled from the time of
initial power-on until it begins to download a Cisco IOS configuration file.
Cisco uBR905 Router Hardware Installation Guide
B-4
Console Port Signaling and Cabling
Console Port (DCE)
RJ-45
Pinout
1
1
2
3
4
5
6
7
1
8
signals. To accommodate other devices that use these signals, pin 1 on the console port (RTS) is connected
internally to pin 8 (CTS), so that devices that assert the RTS signal automatically receive the CTS signal
in reply.
Terminal Port (DTE)
RJ-45 DB-25
Pinout Pinout
8 5
7 6
6 3
5 7
4 7
3 2
2 20
1 4
Appendix B Connector and Cable Specifications
DB-9
Pinout Signal
8 CTS
6 DSR
2 RxD
5 GND
5 GND
3 TxD
4 DTR
7 RTS
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