7-13
Cisco Network Modules Hardware Installation Guide
OL-2485-20
Chapter 7 Connecting ISDN PRI Network Modules
PRI Module LEDs
Connecting CE1/PRI-U Modules to the Network
To connect a CE1/PRI-U (75-ohm) module to the network, use the appropriate cable to connect the
CE1/PRI-U port to an E1 CSU (see
Figure 7-18
). These ports are color-coded tan. The illustration shows
a CSU with BNC connectors.
Figure 7-18 Connecting a CE1/PRI-U Module to an E1 CSU
(DB-15-to-BNC Connectors)
PRI 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.
All PRI modules display four additional LEDs for each port. These LEDs are described in
Table 7-4
.
LOOP
BACK
EN
FE-PRI
1FE-1CE1-B/U
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
10/100BaseT
COLL
LINK
100Mbps
FDX
H7471
CE1/PRI-U
BNC connectors
E1 CSU
E1 cable for 75-ohm
unbalanced connections
with BNC connectors
at the network end
CTRLR 0
Table 7-4
ISDN PRI Network Module LEDs
LED
Meaning
RA
Local alarm at remote end of connection
LA
Loss of signal, loss of frame, or unavailability because of
excessive errors
LP
Loopback mode
CD
Carrier received on telco link