Nortel Circuit Card Installation Manual page 836

Page 836 of 906
553-3001-211 Standard 3.00
NTRB21 DTI/PRI/DCH TMDI card
Cross-connect – Level 1 (DSX-1), or LD-1. Equalizers are switch selectable
through dip-switches. The settings are shown in Table 264.
Table 264
NTRB21 switch settings
Distance to Digital
Cross-Connect
0 - 133 feet
133 - 266 feet
266 - 399 feet
399 - 533 feet
533 - 655 feet
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.
August 2005
Switch Setting
1 2
DCH F/W (LEN 0)
Off Off
Off On
Off Off
Off On
Off Off
3 4
(LEN 1) (LEN 2)
Off On
On Off
On Off
Off Off
Off Off