B-4
Cisco uBR905 Router Hardware Installation Guide
OL-0598-01 (9/2000)
Appendix B Connector and Cable Specifications
Console Port Connector and Cables
Note
Both the standard straight-through and crossover Ethernet cables should be Category 5
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.
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.
Note
By default downloading a Cisco IOS configuration file disables the console port and
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.
Table B-2
Console Port Signaling and Cabling
Console Port (DCE)
Terminal Port (DTE)
Signal
RJ-45
Pinout
RJ-45
Pinout
DB-25
Pinout
DB-9
Pinout
Signal
RTS
1
1
1.
The console port does not support hardware flow control, so it does not support nor use the RTS and CTS
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.
8
5
8
CTS
DTR
2
7
6
6
DSR
TxD
3
6
3
2
RxD
GND
4
5
7
5
GND
GND
5
4
7
5
GND
RxD
6
3
2
3
TxD
DSR
7
2
20
4
DTR
CTS
8
1
1
4
7
RTS
