Installation guide

4-88 Cisco 4000 Series Installation Guide

Network Connection Considerations

CE1/PRI Network Processor Module Jumper Settings

The jumpers on the CE1/PRI network processor module set capacitive coupling between

the transmit or receive shield and chassis ground, and the cable resistance (120 ohm or

75 ohm).

By default, the CE1/PRI network processor module is set with capacitive coupling between

the receive (RX) shield and chassis ground. This provides direct current (DC) isolation

between the chassis and external devices, as stated in the G.703 speciﬁcation. Jumper J2

(see Figure 4-44) controls this function. To set capacitive coupling between the transmit

(TX) shield and chassis ground, set jumper J2 as described in Table 4-9.

Figure 4-44 also shows the location of jumpers J1, J3, J4, J5, and J7. These jumpers set the

cable impedance to 120 ohm or 75 ohm. The ﬁgure shows the cable impedance set to

120 ohm.

Figure 4-44 Location of Jumpers on the CE1/PRI Network Processor Module

H3146

J2 J3