T7234 데이터 시트보기 (PDF) - Agere -> LSI Corporation
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T7234 Datasheet PDF : 116 Pages
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Data Sheet
January 1998
T7256 Single-Chip NT1 (SCNT1) Transceiver
S/T-Interface Frame Structure (continued)
In the TE-to-NT direction, in at least four of five frames, this second violation occurs within 13 bits of the F bit. If this
coding algorithm is not maintained, the receiver loses synchronization, but the T7256 continues transmitting.
TIME
L F L B1 B1
48 1 2 3 4
48 bits IN 250 µs
B1 B1 E D A FA N B2 B2
B2 E D M B1 B1
9 10 11 12 13 14 15 16 17
23 24 25 26 27 28
B1 E D S B2 B2
34 35 36 37 38 39
B2 E D L F L
45 46 47 48 1
FA/N BIT PAIR
INVERT TO FLAG
Q-BIT TRANSMISSION
MULTIFRAME SYNC
BIT (OPTIONAL, ONCE
IN 20 FRAMES)
(NT TO TE)
+0 D L F B1
1
48 1 2 3 4
–0
2-bit OFFSET
B1 L D L FA L B2 B2
10 11 12 13 14 15 16 17
Q-BIT OPTION
(EVERY 5TH FRAME)
B2 L D L B1 B1
23 24 25 26 27 28
B1 L D L B2 B2
34 35 36 37 38 39
B2 L D L
45 46 47 48
(TE TO NT)
F = Framing bit
L = dc balancing bit
D = D-channel bit
E = Echo D-channel bit
FA = Auxiliary framing bit or Q-channel bit
N = Bit set to binary value N = FA
A = Activation bit
S = S-channel bit
M = Multiframe synchronization bit
B1 = Bit within B channel 1
B2 = Bit within B channel 2
INFO 0
INFO 2
Signals from NT to TE
No signal.
INFO 0
Frame with all bits of B, D, and D echo (E) channels set to INFO 1
binary ZERO; bit A set to binary ZERO; N and L bits set ac-
cording to the normal coding rules.
Signals from TE to NT
No signal.
A continuous signal with the following pattern:
positive ZERO, negative ZERO, six ONEs.
INFO 4 Frames with operational data on B, D, and E channels; bit INFO 3 Synchronized frames with operational data on B
A set to binary ONE.
and D channels.
5-2480 (C)
Figure 7. Details of NT and TE Frames
Lucent Technologies Inc.
15
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