Panasonic KX-TD500, Руководство по установке

Страница: 33 / 316

System Outline
Installation Manual 33
1.4.2 CO Trunk Cards
Loop Start Central Office Trunk (LCOT) Card (KX-T96180);
This card interfaces 8 central office loop start trunks and the TDM bus. It provides 8 CO lines
to the system per LCOT card. With loop start, a line is seized by bridging through a resistance
between the tip and ring (both wires) of the telephone line.
Ground Start Central Office Trunk (GCOT) Card (KX-T96181);
This card interfaces 8 central office trunks and the TDM bus. It provides 8 CO lines to the
system per GCOT card.
This card uses a way of signaling on subscriber trunks in which one side of the two wire trunk
(typically the "Ring" conductor of the Tip and Ring) is momentarily grounded to get a dial
tone.
Note
• There are two types of switched trunks one can typically lease from a local phone
company — Loop Start and Ground Start.
You must be careful to order the correct type of trunk from your local phone company
and correctly install your telephone system at your end — so that they both match.
Direct Inward Dialing Trunk (DID) Card (KX-T96182);
This card interfaces 4 central office trunks arranged for Direct Inward Dialing (DID) and the
TDM bus.
T1 Digital Trunk Card (KX-T96187);
This card interfaces 1 T1 line and the TDM bus. It is available to connect a T1 line to the system
per T1 card. A T1 line has a capacity of 24 voice conversations.
Enhanced Loop Start Central Office Trunk (ELCOT) Card (KX-TD50180);
This card interfaces 8 central office loop start trunks and the TDM bus. It provides 8 CO lines
to the system per ELCOT card. With loop start, a line is seized by bridging through a resistance
between the tip and ring (both wires) of the telephone line. This card supports Caller ID
service.
ISDN Basic Rate Access Interface (BRI) Card (KX-TD50288);
This card interfaces ISDN Basic Access line (2B+D). It is available to connect 8 BRI-ISDN
lines to the system per BRI-ISDN card. A BRI-ISDN line has capacity of 2 voice
conversations.