Ds-1 Carrier Interface - Nortel Enterprise 1000 Reference Manual

DS-1 Carrier interface

Table 54
NTRB21 switch settings
Distance to Digital Cross-Connect
0 - 133 feet
133 - 266 feet
266 - 399 feet
399 - 533 feet
533 - 655 feet
Succession Communication Server for Enterprise 1000 Circuit Card Reference Guide
The ON setting for DPNSS (U.K.) is not supported at this time.
Transmitter
The transmitter takes the binary data (dual unipolar) from the PCM
transceiver and produces bipolar pulses for transmission to the external
digital facility. The Digital Signal – Level 1 (DS-1) transmit equalizer allows
the cabling distance to be extended from the card to the Digital Signal Cross-
connect – Level 1 (DSX-1), or LD-1. Equalizers are switch selectable through
dip-switches. The settings are shown in Table 54.
Receiver
The receiver extracts data and clock from an incoming data stream and
outputs clock and synchronized data. At worst case DSX-1 signal levels, the
line receiver operates correctly with up to 655 feet of ABAM cable between
the card and the external DS-1 signal source.
NTRB21 DTI/PRI/DCH TMDI card
Switch Setting
1 2
DCH F/W (LEN 0)
Off Off
Off On
Off Off
Off On
Off Off
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3 4
(LEN 1) (LEN 2)
Off On
On Off
On Off
Off Off
Off Off