Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 112

4-Port Serial Network Module
Figure 5-6
4-Port Serial Network Module LEDs
All network modules have an enable (EN) LED. This LED indicates that the module has passed its
self-tests and is available to the router.
Each port on the 4-port serial network module also has the additional LEDs shown in
described in
Figure 5-7
SERIAL
4T
Table 5-7
LED
CN/LP
RXC
RXD
TXC
TXD
Cisco Network Modules Hardware Installation Guide
5-10
Connecting a 4-Port Serial Module to a CSU/DSU
SERIA L
4T
SERI AL 3
CN/LP RXC
RXD TXC TXD
CN/LP RXC RXD
Serial port (DB-60)
Serial transition
cable
EIA/TIA-232, EIA/TIA-449, V.35,
X.21, or EIA-530 connector
Table 5-7.
4-Port Serial Network Module LEDs
SERIAL 3 SERIAL 2
CN/LP RXC RXD TXC TXD CN/LP RXC RXD
4-Port Serial Network Module LEDs
Meaning
In connect mode when green, in loopback mode when yellow
Receive clock
Receive activity
Transmit clock
Transmit activity
SERI AL 2
SERI AL 1
SERI AL 0
TXC TXD
CN/LP RXC RXD
TXC
TXD
CN/LP RXC RXD
TXC
CSU/DSU or
SERIAL 1
TXC TXD CN/LP RXC RXD TXC TXD
Serial port LEDs
Chapter 5 Connecting Serial Network Modules
EN
TXD
other DCE
SERIAL 0
EN
CN/LP RXC RXD TXC TXD
Enable LED
Figure 5-7 and
OL-2485-20