Avaya Configuring Line Services Bedienungsanleitung Seite 56

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Configuring Line Services
2-20 114078 Rev. A
ESF
The D4 format 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
(Figure 2-9). 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)
Figure 2-9. Extended Superframe
Bipolar Format
T1 and E1 use bipolar format for signals. In bipolar format, alternating positive
and negative pulses on the digital line signify the number one, and the absence of
a pulse signifies zero
(Figure 2-10). A negative pulse must always follow a
positive pulse, and vice versa.
Extended Superframe
Frame 24Frame 23Frame 2Frame 1
Framing Bit
LS0011A
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