Section
300~installation
Ground Start and DID Trunks
Guidelines
Chapter 4. Trunks and Lines
l
The following procedure covers ground-start (VB-43531) and DID
(VB-
43541) installation using the main trunk connector. For instructions on
using the expansion trunk connector, see “Trunk and Line Expansion” on
page 4-43.
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For pinouts and color codes for the main trunk connector, see Table 4-2 on
.
page 4-5.
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Each circuit on the ground-start trunk card can be used as either a
loop-
start or ground-start trunk. By default, all circuits on the ground-start trunk
are assigned as loop start.
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The ground-start trunk card requires CPC-B Version 1.0 or higher.
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The DID card requires CPC-B (Version 2.0 or higher) and SCC-B (Version
1.2 or higher).
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Both ground start and DID trunks require an external -48V floating output
power supply. The following table shows -48V power consumption for
one- and two-cabinet systems.
Table 4-4.
-48V current consumption
for
ground-start and
DID
trunks
System Size
Current Consumption
(Output voltage = 48
k
4 V
Ripple voltage
=
k.500
mVp-p)
1
One-cabinet system
I
1Amp
Two-cabinet’system
1
2Amps
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The following -48V floating output power supplies have been tested with
DBS ground-start and DID trunks.
Table 4-S.
-48V power supplies tested with the DBS
Manufacturer Model Number Rating
Valcom
VP-2048B
2 Amps
Tellabs
8 l-8002
2 Amps
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The following “Installation” section includes details on installing the
-48V
power supply.
DBS-70-300
DBS Manual
-
Issued
8/l/95
4-9
Technical Manuals Online! - http://www.tech-man.com
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