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Chapter 3. System Features
T1 Interface
(CPC-B Version 4.0 or higher)
Description
The T1 Interface is a digital trunk card that provides twenty-four 64 kbps
channels, for a total transmission rate of 1.544 Mbps. T1 lines can be leased
from local exchange carriers and long-distance carriers.
The DBS T1 Interface supports the following options:
SF or ESF Framing Formats
Either super frame (SF) or extended super frame (ESF) formats can be used
with the DBS T1.
The superframe consists of 12 frames, with each frame including 193 bits.
Each frame is separated by a framing bit.
An extended super frame consists of 24 frames, double the length of the super
frame (SF) format. ESF also supports monitoring and maintenance
capabilities that are not available with the SF format.
Flexible Trunk Signaling Modes
The T1 Interface provides the following trunk signaling modes. The
signaling modes can be assigned on a per-channel basis:
• Loop start
• Ground start
• E&M.
Related Programming
• FF1 (System): T1 Settings (all)
• FF2 (Trunks): Trunk Type
• FF2 (Trunks): Trunk Port Class
• FF3 (Extension): Station Port Class
Hardware Requirements
• The following hardware is required to install a T1 in a single cabinet:
Page 3-54
DBS Manual - Revised April 2000
Section 700 - Operation
DBS-2.3/9.2-700
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