5-10
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 5 Connecting Serial Network Modules
4-Port Serial Network Module
Figure 5-6
Connecting a 4-Port Serial Module to a CSU/DSU
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
Figure 5-7
and
described in
Table 5-7
.
Figure 5-7
4-Port Serial Network Module LEDs
H9598
CN/LP RXC
SERIAL 3
SERIAL 2
SERIAL 1
SERIAL 0
RXD
TXC
TXD
CN/LP RXC RXD TXC TXD
CN/LP RXC RXD TXC TXD
CN/LP RXC RXD TXC TXD
EN
Serial transition
cable
CSU/DSU or
other DCE
EIA/TIA-232, EIA/TIA-449, V.35,
X.21, or EIA-530 connector
Serial port (DB-60)
SERIAL
4T
Table 5-7
4-Port Serial Network Module LEDs
LED
Meaning
CN/LP
In connect mode when green, in loopback mode when yellow
RXC
Receive clock
RXD
Receive activity
TXC
Transmit clock
TXD
Transmit activity
H9599
CN/LP RXC
SERIAL 3
SERIAL 2
SERIAL 1
SERIAL 0
RXD
TXC
TXD
CN/LP RXC
RXD
TXC
TXD
CN/LP RXC
RXD
TXC
TXD
CN/LP RXC
RXD
TXC
TXD
EN
SERIAL
4T
Serial port LEDs
Enable LED