psf21911 ETC-unknow, psf21911 Datasheet - Page 42
psf21911
Manufacturer Part Number
psf21911
Description
Isdn Echocancellation Circuit Terminal Applications Iec-q
Manufacturer
ETC-unknow
Datasheet
1.PSF21911.pdf
(164 pages)
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PSB 21911
PSF 21911
U-Transceiver
2.5.1
U-Frame Structure
Each basic frame consists of 18 bits for the (inverted) synchronization word; 6 overheads
bits are allocated for system functions, and 216 bits transfer the userdata of 2B + D-
channel (i.e. userdata of 12 IOM-frames is packed into one basic U-frame).
Data is grouped together into U-superframes of 12 ms. The beginning of a new
superframe is marked with an inverted synchronization word (ISW). Each superframe
consists of eight basic frames (1.5 ms) which begin with a standard synchronization word
(SW) and contain 222 bits of information (table 6).
Semiconductor Group
42
11.97
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