Patton electronics G.SHDSL NTU, User Manual

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G.SHDSL NTU User Manual V0.03 81
STU-C (E1)
STU-R
(V.35)
DTE DTE
V.35
E1 SHDSL
Frame N x 64 (N=1~32)
STU-C (V.35)
STU-R (E1) DTE DTE
E1
V.35 SHDSL
Frame N x 64 (N=1~32)
Time slot, N value, is place of data in the frame. Time Slot Number 1~31 (N=1~31) is Fractional E1 and Time Slot
Number 32 (N=32) is unframed.
Fractional E1
For fractional E1( FE1), the data rate is from 64k, N=1, to 1984k, N=31, according to the E1 frame.
If the E1 frame is PCM31(FAS) or PCM31C(FAS+CRC4), there have 1~31 available time slot for used data.
For example, if the data rate of SHDSL line set to be 512k, the time slot number is 8 and first time slot number is 1.
The frame is shown as below.
FAS Data Data Data Data Data Data Data Data
0 1 2 3 4 5 6 7
8 31
Time Slot
64k 64k 64k 64k 64k 64k 64k 64k 64k 64k 1408k
9 ~ 30
The First Time Slot setting of FAS and FAS+ CRC4 (PCM31 and PCM31C)have to follow the rule:
RULE
First Time Slot
≦
31- Time Slot Number
First Time Slot
≦
31- Time Slot Number