Specifications

Reference Guide 6-11

WAN Card WAN Card Descriptions

When assembling and installing the module on the WAN card,

it is our advice that the plastic

standoffs be removed to eliminate the possibility of errors on the associated T1 or E1

lines.

For this reason, the plastic standoffs are no longer being supplied by the manufacturer

for new WAN modules.

6.2.6.6 Setting Jumpers for Balanced or Unbalanced E1 Operation

You can configure CEPT E1 links for either 120-ohm balanced or 75-ohm unbalanced

operation by setting the jumpers on the DSX/CEPT module as previously described, setting

them or the E1 Interface Adapter Panel, or setting both of these units. Refer to Table 6-1 for

information on which revisions of the DSX/CEPT module have jumpers. The adapter panel is

a replacement for the cover on the front-loading chassis with power supplies on the side.

Figure 6-19 shows the jacks and jumpers on this panel.

Table 6-1. Balanced/Unbalanced E1 Link Jumper Compatibility

Figure 6-19. E1 Interface Adapter Panel

For 120-ohm balanced E1 operation, set the jumpers on the adapter panel as shown.

Both

DSX/CEPT Modules should be set for balanced operation prior to installation.

Module Type Rev. A Rev. B Rev. C Rev. D Rev. E Rev. F

811 Yes Yes n/a Yes No No

81120 No No n/a n/a n/a n/a

AL UNBAL

ptions on the Rear

NBAL BAL