CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 64)

Chapter 4 Data Interfaces 2240 Fiber Optic Modem User Manual
T1/E1 Interfaces
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Table 4-14. Configuration Switch Settings
This interface performs jitter attenuation of the transmit line input signal. It is also designed to
propagate an all "1's" AMI stream if the end-to-end line is interrupted at any point.
When using any of the Transparent Bipolar Interfaces, the 2240 modem rate and mode front
panel DIP switches should be set as follows: 1-4 = closed, 5-7 = open (Rate 0, Mode 7). In
addition, the first two positions of the internal DIP switch S1 must be:
CD/DCD = OFF and CD/SYNC = ON. Refer to section 2.1.3.1.
If the interface signal is lost, Loss of Signal (LOS), the all "1's" Alarm Indication Signal (AIS) is
sent to the other end.
Factory setting: Both jumpers are OFF
Table 4-15. Transparent Bipolar Line Interfaces
Model # Interface Connector Type Speed
4B1 DA-15 1.544 Mhz T1 or 2.048 Mhz E1
4B2 Terminal Block 1.544 Mhz T1 or 2.048 Mhz E1
4B3 BNC (75 ohm) 1.544 Mhz T1 or 2.048 Mhz E1
These interfaces are fully transparent to line codes such as B8ZS or HDB3. Three DIP
switches (3, 4 and 5) are provided for selecting various line build out settings as
indicated in Table 4-14. Standard factory settings are T1 at 0-133 feet for all three
models. Two DIP switches (1 and 2) are provided to select CCITT speed (2.048 Mhz) or
T1 speed (1.544 Mhz).