Product specifications

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