Avaya Configuring WAN Line Services Manual de usuario Pagina 93

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Configuring E1 or T1 Services
117021-A Rev. A 6-3
Setting the T1 Frame Type
T1 framing digitizes analog signals into a level-zero digital signal (DS0) with
8-bit words. T1 uses two types of frame formats:
D4 Format
ESF Format
The frame format of the interface should match the frame format that the
associated T1 equipment requires.
D4 Format
D4 (or superframe, SF) framing is the original T1 frame format. A D4 frame
comprises
One framing bit.
A DS0 timeslot for each channel on the line. A DS0 timeslot is an 8-bit sample
from a channel.
A T1 line generates 8000 D4 frames/s.
ESF Format
The D4 framing format, superframe (SF), does not allow testing of a digital line
while the line is in use. To allow such testing, you can use the extended
superframe (ESF).
An ESF comprises 24 D4 frames. As each D4 frame contains a framing bit, an
ESF has 24 framing bits that it uses for the following purposes:
Synchronization (6 bits)
Error checking (6-bit cyclic redundancy check)
Diagnostic data channel (12 bits)
By default, the T1 interface uses ESF framing format. Set the Frame Type for this
interface.
Site Manager: Frame Type parameter: page A-58
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