Cisco 2600 Series Operation Manual page 64

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4-Port Serial Network Module
Figure 6-5
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.
6-12
Cisco Network Modules Hardware Installation Guide
Connecting a 4-Port Serial Module to a CSU/DSU
SERI AL
4T
SER IAL 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
SER IAL 2
SER IAL 1
SER IAL 0
TXC
TXD
CN/LP RXC RXD
TXC
TXD
CN/LP RXC RXD
EN
TXC
TXD
CSU/DSU or
other DCE

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