A T1 line carries twenty-four 64 kbps-voice channels at 1.5 Mbps, and can be used as a public or private line. Voice is digitized by Pulse Code Modulation (PCM).

Channel Type

[LCOT/GCOT/DID/TIE/OPX]
The T1 card supports five different channel types to provide connection at minimum expense. One of the five channel types can be assigned to any one of the T1 card's 24 channels individually, according to usage rates and customer needs.

T1 Features

The following table shows the features available for each channel type:

Each T1 feature is explained in the following chart.

Feature

Description

(1) TIE

TIE Line Service

Refer to the TIE Line Service feature. (

1.26.1 TIE Line Service)

(2) DID

Direct Inward Dialing (DID)

Refer to the DID feature. (

1.1.1.3 Direct Inward Dialing (DID))

(3) DIL

Direct In Line (DIL)

Refer to the DIL feature. (

1.1.1.2 Direct In Line (DIL))

(4) OPX

Off Premise Extension (OPX)

A single line telephone (SLT) which is installed off site can perform as if it were installed locally. The SLT makes and receives calls through the PBX. An extension number can be given to the OPX, and extension data such as Class of Service (COS) is also applied.
[Example]

(5) ANI

Automatic Number Identification (ANI)

Receives the caller's number from a T1 line.
When the ANI number is received, it can be treated the same as a Caller ID number. (

1.16.1 Caller ID)