Figure 2-35 Location Of Jumpers On The Ce1 Module; Figure 2-36 E1 Interface Cable For 75-Ohm, Unbalanced Connections (With Bnc Connectors) - Cisco EF4116 Hardware Installation And Maintenance Manual

Figure 2-35
Table 2-7
Jumper
J2
J1, J3, J4,
J5, J7
1. All of these jumpers must be set to the same impedance.
Warning
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
Location of Jumpers on the CE1 Module
J4
J2 J3
J5
J7
Jumper Settings and Functions
Position Function
1 and 2 Connects the Rx shield to chassis ground.
2 and 3 Connects the Rx shield through capacitive coupling to chassis ground.
1 and 2 Sets cable impedance to 120-ohm
1
2 and 3 Sets cable impedance to 75-ohm
To prevent problems with the E1 interface and to reduce the potential for injury, jumper J2
E1 Interface Cable for 75-Ohm, Unbalanced Connections
(with BNC Connectors)
Network Connection Considerations
J1
Preparing for Installation 2-33