Section 300-Installation Chapter 4. Trunks and Lines
DBS-2.3/9.2-300 DBS Manual - Revised April 2000 4-9
Ground Start and DID Trunks
Guidelines
• 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 4-44.
• For pinouts and color codes for the main trunk connector, see Table 4-2 on
page 4-5.
• 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.
• The ground-start trunk card requires CPC-B Version 1.0 or higher.
• The DID card requires CPC-B (Version 2.0 or higher) and SCC-B
(Version 1.2 or higher).
• 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
• The following -48V floating output power supplies have been tested with
DBS ground-start and DID trunks.
Table 4-5. -48V power supplies tested with the DBS
• The following “Installation” section includes details on installing the -48V
power supply.
System Size Current Consumption
(Output voltage = 48
±
4 V
Ripple voltage =
±500
mVp-p)
One-cabinet system 1 Amp
Two-cabinet system 2 Amps
Manufacturer Model Number Rating
Valcom VP-2048B 2 Amps
Tellabs 81-8002 2 Amps
