Cisco Systems OL-12811-01 manual CE1/PRI Module Jumper Settings, Function

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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