Connecting Cisco ISDN PRI Network Modules to the Network

Channelized E1/ISDN PRI Balanced (120-Ohm) Network Modules

Figure 11 1-Port Channelized E1/ISDN PRI Network Module (Balanced)

cE1-B PRI

REMOTE ALARM

LOCAL ALARM

LOOPBACK

CARRIER DETECT

CTRLR 0

CE1/PRI-B port

EN

H7260

 

Figure 12 2-Port Channelized E1/ISDN PRI Network Module (Balanced)

cE1-B PRI

REMOTE

ALARM

LOCAL

ALARM

LOOPBACK

CARRIER

DETECT

 

 

 

 

 

 

CTRLR 1

REMOTE

ALARM

LOCAL

ALARM

LOOPBACK

CARRIER

DETECT

CTRLR 0

EN

H7261

 

CE1/PRI-B ports

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.

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

 

 

 

 

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.

Connecting Cisco ISDN PRI Network Modules to the Network

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Cisco Systems OL-12811-01 manual CE1/PRI Module Jumper Settings, Connecting CE1/PRI-B Modules to the Network, Function