
Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network Modules
10
Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Unbalanced (75-Ohm) Network
Modules
This section provides information about the following network modules for Cisco modular routers:
• 1-port channelized E1/ISDN PRI unbalanced (75-ohm) network module (NM-1CE1U or
CPANM-1CE1U) (see Figure 16). This module is also referred to as the 1-port CE1/PRI-U network
module.
• 2-port channelized E1/ISDN PRI unbalanced (75-ohm) network module (NM-2CE1U or
CPANM-2CE1U) (see Figure 17). This module is also referred to as the 2-port CE1/PRI-U network
module.
Figure 16 1-Port Channelized E1/ISDN PRI Network Module (Unbalanced)
Figure 17 2-Port Channelized E1/ISDN PRI Network Module (Unbalanced)
CE1/PRI Module Jumper Settings
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground (see
Table 3). 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 for the module.
LOOPBACK
CTRLR 0
EN
cE1-U
PRI
H8499
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
CE1/PRI-U port
LOOPBACK
CTRLR 0
EN
cE1-U
PRI
H8500
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
LOOPBACK
CTRLR 1
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
CE1/PRI-U ports
Table 3 CE1/PRI Module Jumpers
CE1/PRI Module Type Default 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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