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Connecting Cisco ISDN PRI Network Modules to the Network
Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules
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Connecting Cisco ISDN PRI Network Modules to the Network
Figure 11 1-Port Channelized E1/ISDN PRI Network Module (Balanced)
Figure 12 2-Port Channelized E1/ISDN PRI Network Module (Balanced)
CE1/PRI modules are available with one or two E1 ports and with balanced or unbalanced interfaces.
These modules receive and transmit data bidirectionally at the E1 rate of 2.048 Mbps, and provide up to
30 virtual channels per E1 port. Each channel can be configured individually as a serial interface.
CE1/PRI Module Jumper Settings
Jumpers on CE1/PRI modules can be used to connect or disconnect receive shield to ground. (See
Table 2.) 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.
Connecting CE1/PRI-B Modules to the Network
To connect a CE1/PRI-B (120-ohm) module to the network, use the appropriate cable to connect the
CE1/PRI-B port to an E1 CSU. (See Figure 13, Figure 14, and Figure 15, showing DB-15, twinax, and
RJ-45 CSUs, respectively.) These ports are color-coded tan.
LOOPBACK
CTRLR 0
EN
cE1-B
PRI
H7260
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
CE1/PRI-B port
LOOPBACK
CTRLR 0
EN
cE1-B
PRI
H7261
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
LOOPBACK
CTRLR 1
LOCAL
ALARM
REMOTE
ALARM
CARRIER
DETECT
CE1/PRI-B ports
Table 2 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