Specifications

S
X-2000 General Information Guide
2
4 Revision A 5000309
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Trunk Cards
Trunk cards include
• LS/GS trunk card
• E&M trunk card
• DID Loop Tie trunk card.
LS/GS Trunk Card
The Loop Start/Ground Start (LS/GS) trunk card interfaces to the analog LS/GS Central Office
(CO) trunks, and is used to terminate eight CO trunks (non-dial-in trunks). The LS/GS trunk
card connects to any Peripheral Interface card slot on the peripheral shelf via connectors J1
and J2. The LS/GS trunk card has eight circuits.
E&M Trunk Card
The Ear and Mouth (E&M) trunk card provides a means of interfacing four external trunk circuits
to the system. E&M trunk cards connect to any Peripheral Interface card slot on the peripheral
shelf via connectors J1 and J2. The E&M trunk card ties two switches together (tie line), and
supports music-on-hold. The E&M trunk card has four circuits.
DID Loop Tie Trunk Card
The Direct Inward Dialing (DID) Loop Tie trunk card terminates a maximum of four trunks.
These trunks can be Direct Inward Dialing (DID) trunks, Loop Tie (LT) trunks, or any combination
of DID and LT Trunks. Direct Inward Dialing provides direct access to system subscriber lines
from the public telephone network. Loop Tie provides a means of connecting two systems
together over a common trunk.
The DID Loop Tie trunk card involves renting a group of numbers from the CO. With this card,
outside calls are switched directly to the extension called; therefore, no attendant is required.