Trunk/Tie Line Cards; Loop Start Trunk Card - Ltrk/8 (Vb-44510); Loop Start/Ground Start Trunk Card - Lgtrk/8 (Vb-44511); Isdn Primary Rate Interface Card (T/S-Point) And Qsig - Pri/23 (Vb-44540) - Panasonic DBS 576 Technical Manual

Trunk/Tie Line Cards

Loop Start Trunk Card - LTRK/8 (VB-44510)

The Loop Start Card supports up to 8 loop start CO lines and can be installed in any flexible slot. This
card meets UL1459 safety requirements, and can be directly connected to CO lines.

Loop Start/Ground Start Trunk Card - LGTRK/8 (VB-44511)

This card supports both Loop Start and Ground Start Trunks. Up to 8 CO lines of any combination of
types can be connected. This card installs in any flexible slot. An internal –48V Power Supply (VB-
44022) must be installed in the same cabinet with the Loop Start/Ground Start Card.
This card meets UL1459 safety requirements, and can be directly connected to CO lines.
ISDN Primary Rate Interface Card (T/S-point)
This card supports T-point Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI)
(23B+D/24B:1544kbps) and also S-point ISDN PRI.
networking protocol, used to tie DBS 576/HD systems together across ISDN lines.
The PRI card can be set to support either 8, 16 or 23/24 channels. When the card is set for 16
channels, the card logically occupies 2
channels, the card logically occupies 3
Unlike most other cards, due to the interaction between card slots, the PRI card must be installed in
specific Free Slots. Up to 3 PRI cards can be installed in a single cabinet. A fully configured 6-cabinet
system can support up to 18 PRI cards.
T-point PRI requires a DSU (Digital Service Unit) for connection to the carrier circuit.
A Network Sync card

ISDN Basic Rate Interface Card (T-point) - TBRI/4 (VB-44530)

This supports T-point Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI)
(2B+D:144kbps). This card can be installed in any flexible slot. Up to 4 T-point ISDN lines can be
connected to each TBRI/4 Card.
The T-point BRI Unit supports information transferring capability (speech and data) at the CO trunk.
The TBRI/4 Card connects via NT1 (Network Termination Unit/Type 1) to the T-point ISDN interface.
E&M Trunk Card - E&M/4 (VB-44560)
This card supports E&M type tie line interface (Speech
methods that are supported include Immediate and Wink methods. Each E&M card includes 4
circuits.
When installed in any flexible slot, the E&M Trunk Card supports call signal detection and answer
from other PBX or carrier equipment, calling to the E&M tie line, dial sending and speech.
An internal –48V Power Supply (VB-44022) must be installed in the same cabinet with the E&M/4
Card.
The E&M interface can connect to another PBX with E&M capability (Types 1, 2 and 5 are supported).
External safety devices (available from standard telecommunications suppliers) are required when
installing this unit outside the building.
24 Chapter 2 - System Hardware
consecutive
consecutive
(VB-44460) is also required.
and QSIG - PRI/23 (VB-44540)
This card can also be set to function on the QSIG
flexible card slots. When the card is set for 23/24
flexible card slots.
path 4W/2W, Control line 4W). The signaling