TSP Edge User’s Manual
40-400-00065, Rev. E
160
D4
A T1 framing type. Also known as D4 framing. A D4 frame is 193 data
bits consisting of 192 data bits (8 bits per channel times 24 channels),
and a single framing bit. D4 defines the 12 bit sequence sent as the
193rd bit in 12 consecutive frames. This framing pattern is
100011011100. D4 framing also requires that the 8th bit of every byte of
every frame be set to 1. This reduces the rate from 64 Kbps to 56 Kbps
(7 bits/frame X 8,000 frames/second).
DDE
Dynamic Data Exchange. A Microsoft messaging specification that
allows compliant applications to update each other as data changes.
Delay Dial
Signaling protocol on a T1/E1 channel. Accomplished by a change in
the A and B signaling bits used in Robbed-bit signaling operation.
DID
Direct Inward Dial. A trunk circuit from the Central Office that supplies
the last 2, 3, or 4 digits of the dialed number to the terminating switch,
typically a PBX. This feature allows callers outside a company to call an
employee without going through an operator.
DNIS
Dialed Number Identification Service. A feature of 800 and 900 number
service where the “dialed number” is sent to the called party.
DS0
Digital Service, Level 0. The standard definition of a single channel at
64 Kbps using PCM (Pulse Coded Modulation) used in a T1 circuit.
DS1
Digital Service, Level 1. A signal stream comprised of 24 channels and
one framing bit running at 8 kHz per frame (193 bits X 8,000 =
1,544,000 bps), the standard North American T1 rate.
DSU
Data Service Unit or Digital Service Unit. CPE used to terminate T1
services at a customer site.
E&M
An interface circuit that uses two separate control leads for signaling,
the E lead and the M lead. Signaling is performed using Battery and
Ground in analog trunk circuits. A digital connection like T1 uses the A
& B leads for control. There are variations of E & M circuits, called
Types, such as Type I, Type II, etc.
E1
A digital data stream defined as 30 independent channels processed
simultaneously over two wire pairs at an aggregate speed of 2,048,000
bits per second. Defined by CCITT/ITU, it consists of 30 voice
channels, one signaling channel, and one framing channel.
Edge Alerts
Edge software options for specifying visual and/or audible alerts for
several error types encountered during Edge configuration and
operation.
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