Preparing for Installation 2-33
Network Connection Considerations
Figure 2-35 Location of Jumpers on the CE1 Module
Table 2-7 Jumper Settings and Functions
Warning To prevent problems with the E1 interface and to reduce the potential for injury, jumper J2
should be configured by trained service personnel only. For either impedance option, a jumper
installed at J2 bypasses the AC-decoupling capacitor to ground, thereby coupling the interface
directly to AC. This is a setting that could pose a risk of severe injury. By default and for safety, J2
has been configured with no ground.
E1 Cabling
For the CE1 module, four serial cables are available from Cisco Systems. All three have DB-15
connectors on the CE1end and either BNC, DB-15, Twinax, or RJ-45 connectors on the network end.
Figure 2-36, Figure 2-37, Figure 2-38, and Figure 2-39 show the E1 interface cables (respectively).
Figure 2-36 E1 Interface Cable for 75-Ohm, Unbalanced Connections
(with BNC Connectors)
Jumper
Position Function
J2 1 and 2
2 and 3
Connects the Rx shield to chassis ground.
Connects the Rx shield through capacitive coupling to chassis ground.
J1, J3, J4,
J5, J7
1
1. All of these jumpers must be set to the same impedance.
1 and 2
2 and 3
Sets cable impedance to 120-ohm
Sets cable impedance to 75-ohm
H3146
J1
J2 J3
J5
J7
J4
H2421
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