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Section 700 - Operation Chapter 3. System Features
576-13-700 DBS 576 (USA), Revised 6/11/98 35
Considerations
• The DID Trunk card supports 1 to 4-digit dial-pulse (10 pps) or Dual Tone Multifrequency
(DTMF) signaling.
• DID numbers must be between 0 and 9999.
CO Trunk Interface - Ground Start
Ground start trunks are supported in the System with the VB-44511 Loop Start/Ground Start trunk
interface. Each card supplies 8 circuits that can be individually configured for either loop start or
ground start operation.
Ground start trunks are useful in preventing call collision.
Hardware Requirements
• When ground start trunks are used, the -48V power supply is required.
Related Programming
•N/A
Considerations
•N/A
CO Trunk Interface - ISDN BRI
The System supports ISDN BRI with the VB-44530 ISDN BRI interface unit. The VB-44530 is a T-
Point ISDN-BRI that supports 2 B (bearer) channels and 1 D (data) channel (2B + D; 192kbps). This
unit connects to an ISDN Data Service Unit (DSU). Point-to-point and point-to-multi operations are
selectable.
The ISDN-BRI supports enblock setting and enblock setting at the sub-address.
Hardware Requirements
•N/A
Related Programming
•N/A
Considerations
• A DSU is required (not available from Panasonic).
CO Trunk Interface - ISDN-PRI
The System supports ISDN-PRI with the VB-44540 ISDN PRI Interface unit. The VB-44540 is a T/S-
Point ISDN-PRI that supports 23 B (bearer) channels and 1 D (data) channel (23B + D; 1544kbps).
This unit connects to an ISDN DSU.
Up to 3 units may be installed in a cabinet if you use full channel (23B + D or 24 B). A maximum of
18 units may be utilized in a fully equipped system. When all 24 channels on a unit are utilized, 3 slot
positions are required.
Hardware Requirements
•N/A