Nortel Networks 311 User Manual
1074
NTRB21 DTI/PRI/DCH TMDI card
Feature selection through software configuration for the D-channel includes:
•
56 kbps
•
64 kbps clear
•
64 kbps inverted (64 Kbps restricted)
DCHI can be enabled and disabled independent of the PRI card, as long as
the PRI card is inserted in its cabinet slot. The D-channel data link cannot
be established unless the PRI loop is enabled.
the PRI card is inserted in its cabinet slot. The D-channel data link cannot
be established unless the PRI loop is enabled.
On the NTRB21 use switch 1, position 1 to select either the D-channel
feature or the DPNSS feature, as follows:
feature or the DPNSS feature, as follows:
OFF = D-channel
The ON setting for DPNSS (U.K.) is not supported at this time.
DS-1 Carrier interface
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 enables
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
transceiver and produces bipolar pulses for transmission to the external
digital facility. The Digital Signal – Level 1 (DS-1) transmit equalizer enables
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 438
NTRB21 switch settings
NTRB21 switch settings
Switch Setting
Distance to Digital
Cross-Connect
1
DCH F/W
2
(LEN 0)
3
(LEN 1)
4
(LEN 2)
0 - 133 feet
Off
Off
Off
On
133 - 266 feet
Off
On
On
Off
266 - 399 feet
Off
Off
On
Off
399 - 533 feet
Off
On
Off
Off
533 - 655 feet
Off
Off
Off
Off
The transmitter takes the binary data (dual unipolar) from the PCM
transceiver and produces bipolar pulses for transmission to the external
digital facility. The DS1 transmit equalizer allows the cabling distance to be
extended from the card to the DSX-1 or LD-1 configured in LD 17.
transceiver and produces bipolar pulses for transmission to the external
digital facility. The DS1 transmit equalizer allows the cabling distance to be
extended from the card to the DSX-1 or LD-1 configured in LD 17.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.