Section 300-Installation | Chapter 4. Trunks and Lines |
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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
System Size | Current Consumption | |
| (Output voltage = 48 ± | 4 V |
| Ripple voltage = ±500 | mVp-p) |
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One-cabinet system | 1 | Amp | |
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Two-cabinet system | 2 | Amps | |
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•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
Manufacturer | Model Number | Rating |
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Valcom | VP-2048B | 2 Amps |
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Tellabs | 81-8002 | 2 Amps |
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•The following “Installation” section includes details on installing the -48V power supply.
DBS-2.3/9.2-300 | DBS Manual - Revised April 2000 | 4-9 |
