CTC Union SHDSL Especificaciones descargar pdf (Pagina 61)

FAS Data Data Data Data Data Data Data Data

01234567

831

Time Slot

64k 64k 64k 64k 64k 64k 64k 64k 64k 64k1408k

9 ~ 30

RULE

First Time Slot ? 31- Time Slot Number

FAS

01234 16

Time Slot

64k 64k 64k 64k 64k 64k 64k896k

17 ~ 30

CAS

5 ~ 15

704k

RULE

First Time Slot ? 30 - Time Slot Number

Data Data Data Data Data Data Data Data Data Data Data

01234567

831

Time Slot

64k 64k 64k 64k 64k 64k 64k 64k 64k 64k1408k

9 ~ 30

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 are 1~31 available time slots for data use.

For example, if the data rate of SHDSL line is set to 512k, the time slot number is 8 and first time slot number

is 1. The frame is shown as below.

The First Time Slot setting of FAS and FAS+ CRC4 (PCM31 and PCM31C) must follow this rule:

Using E1 framing FAS+CAS or FAS+CAS+CRC4(PCM30 or PCM30C), the [FAS] will occupy Time Slot 0

and [CAS] will occupy Time Slot 16. There are only 30 Time Slots left for data. The data rate is 1920kbps

(30x64Kbps).

The First Time Slot setting of FAS+CAS and FAS+CAS+CRC4 (PCM30 and PCM30C) must to follow this

rule:

Unframed E1

Used data is inserted into all 32 channels (64Kbps x 32 = 2048Kpbs) of the E1 bit stream

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 119 120

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CTC Union SHDSL Especificaciones Pagina 61