psf21911 ETC-unknow, psf21911 Datasheet - Page 42

• Manufacturer Part Number: psf21911
• Description: Isdn Echocancellation Circuit Terminal Applications Iec-q
• Manufacturer: ETC-unknow

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