Panasonic DBS-576 Technical Manual page 23

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.
This card supports 8 DID incoming CO lines using Immediate and Wink signaling methods. The DID
can be either Dial Pulse (10PPS) or DTMF (only for Wink). DTMF circuits are used when the Wink
method is selected.
An internal –48V Power Supply (VB-44022) must be installed in the same cabinet with the DID Trunk
Card.
The T-1 interface is a digital CO line card that provides up to 24 voice channels over a four-wire
circuit.
The T-1 card can be set to support either 8, 16, or 24 channels. When the card is set for 16 channels,
the card logically occupies 2 flexible card slots. When the card is set for 24 channels, the card
logically occupies 3 flexible card slots.
Unlike most other cards, due to the interaction between card slots, the T-1 card must be installed in
selected flexible card slots. Up to 3 T-1 cards can be installed in a single cabinet. A fully configured 6-
cabinet system can support up to 18 T-1 cards.
The T-1 interface requires a DSU (Digital Service Unit) for connection to the carrier circuit. A Network
Sync card is also required.
The Trunk MDF interface card provides easy connection from the cabinet to the MDF via standard
female 25-pair cables. This card supports Loop Start, Ground Start, and DID trunks. Since each of
these trunk cards uses modular connectors, connection can be made directly to the modular
connectors, bypassing the MDF if so desired.
Each Trunk MDF Interface Card can support up to three trunk cards (24 trunk circuits). Up to 10 Trunk
MDF Interface Cards can be installed in each cabinet. MDF cards attach to the sides of the cabinet
and are hidden by the housing for a neat appearance.
#$    
This card provides 8 digital circuits. Each circuit supports the Panasonic Digital Key Telephone, Digital
Single Line Telephone, DSS/72, and EM/24. Supply voltage for the telephones is supplied by the
digital circuits.
This card can be installed in any flexible slot.
This card provides 8 analog circuits. Each circuit supports standard analog telephone devices such as
analog telephones, answering machines, fax machines, modems, cordless telephones, etc. The
connected device(s) can be either pulse dial (rotary) or DTMF. Ringer circuitry is built into the card.


Chapter 2 - System Hardware 23