CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 65)

Chapter 4 Data Interfaces
T1/E1 Interfaces
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These interfaces allow full inter-operation with any of the synchronous data interfaces when the
customer's T1/E1 is AMI-coded (see Figure 4-3). This interface will not inter-operate with
synchronous data interfaces if the T1/E1 is B8ZS or HDB3.
Two jumper straps are provided for setting the line termination impedance to either 100 ohm for
T1 or 120 ohm for E1 applications. These straps are located near the middle of the interface
board and are provided only for the 4B1 and 4B2 versions. For the 4B3 version (BNC
connectors) the termination impedance is fixed at 75ohms.
Figure 4-2 Transparent Bipolar Interface Connectors