Cisco 3600 Series - Page 64

4-Port Serial Network Module
Cisco Network Modules Hardware Installation Guide
6-12
Figure 6-5 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 6-6 and described in Table 6-6.
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
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