Connecting ISDN PRI Network Modules to a Network 8-17
CE1/PRI Module LEDs
CE1/PRI Module Jumper Settings
Jumpers on the CE1/PRI modules can be used to connect or disconnect receive shield to
ground. (See Table 8-6.) The default setting for balanced, 120-ohm CE1/PRI-B modules
disconnects receive shield to ground. The default setting for unbalanced, 75-ohm
CE1/PRI-U modules connects receive shield to ground. If you are experiencing ground
loop problems with E1 cabling, you may want to try changing the jumper settings in the
module.
Table 8-5 ISDN PRI Network Module LEDs
LED Meaning
REMOTE ALARM Local alarm at remote end of connection
LOCAL ALARM Loss of signal, loss of frame, or unavailability
because of excessive errors
LOOPBACK Controller local loopback
CARRIER DETECT Carrier received on telco link
Table 8-6 CE1/PRI Module Jumpers
CE1/PRI Module Type Default Jumper Setting Function
Balanced, 120 ohm 2 and 3 Disconnects receive shield from
ground
Unbalanced, 75 ohm 1 and 2 Connects receive shield to ground
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