W6691 Просмотр технического описания (PDF) - Winbond

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W6691

ISDN S/T Interface Transceiver

Winbond 

Preliminary W6691

NT → TE

48 bits in 250

µs

D L F L B1B1B1B1B1B1B1B1 E D A FAN B2B2B2B2B2B2B2B2 E D M B1B1B1B1B1B1B1B1 E D S B2B2B2B2B2B2B2B2 E D

0

1

0

2 bits offset

TE → NT

D L F L B1B1B1B1B1B1B1B1 L D L FA L B2B2B2B2B2B2B2B2L D L B1B1B1B1B1B1B1B1 L D L B2B2B2B2B2B2B2B2 L

0

1

0

F = Framing bit

L = DC balancing bit

D = D channel bit

E = D channel echo bit

FA = Auxiliary framing bit or Q-bit

N = Bit set to a binary value N=FA

B1 = Bit within B channel 1

B2 = Bit within B channel 2

A = Bit used for activation

S = Bit used for S channel

M = Multiframe bit

Fig.7.1 Frame structure at S/T interface

There are three wiring configurations according to I.430 : point-to-point, short passive bus and extended

passive bus. They are shown in Fig.7.2.

Publication Release Date: Sep 2001

21

Revision 1.1

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