W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 21

• Manufacturer Part Number: W6691CD
• Description: ISDN S/T Interface Transceiver
• Manufacturer: WINBOND [Winbond]

0
1
0
passive bus. They are shown in Fig.7.2.
0
1
0
D L F L
There are three wiring configurations according to I.430 : point-to-point, short passive bus and extended
D L F
2 bits offset
TE
NT
B
1
F = Framing bit
L = DC balancing bit
D = D channel bit
E = D channel echo bit
F
B
L B
1
A
B
= Auxiliary framing bit or Q-bit
1
1
NT
B
B
TE
1
1
B
B
1
1
B
B
1
1
B
B
1
1
B
B
1
1
B
E D A F
1
B
1
L D L F
Fig.7.1 Frame structure at S/T interface
A
N B
A
2
B
L B
48 bits in 250
2
B
s
2
B
2
B
2
B
2
B
2
B
2
B
2
B
2
B
2
B
2
B
21
2
2
E D M B
B
N = Bit set to a binary value N=F
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
2
B
2
L D L B
1
B
1
B
1
B
1
B
1
B
1
B
1
B
1
B
1
B
1
B
1
B
1
Preliminary W6691
B
1
1
Publication Release Date: Sep 2001
B
E D S B
1
B
1
L D L
2
B
2
A
B
2
B
B
2
2
B
B
2
2
B
B
2
2
B
B
2
2
B
Revision 1.1
B
2
2
B
E D
2
B
2
B
2
L