User manual

FAS Data Data Data Data Data Data Data Data

01234567

831

Time Slots

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

9 ~ 30

ITU 991.2 (2004) (G.SHDSL .Bis) supports data rate up to 5696Kbps, but G.703 (E1 standard) only supports data rate of

2048kbps so the maximum data rate of SHDSL line, connected with E1 DCEs, depends on data rate of E1, 2048kbps.

STU-C (E1)

STU-R (E1) DTEDTE

E1 SHDSL

Frame E1

Data rate # of TS

If the connection is E1 vs V.35 or V.35 vs E1, the framer has to use N x 64k. In this case, the data rate depends on value of N.

Same as above case, SHDSL and V35 can support up to 5696kbps (89 x 64k) data rate, but E1 supports maximum data rate of

2048kbps (32 x 64k).

STU-C (E1)

STU-R

(V.35)

DTEDTE

V.35

E1 SHDSL

Unframed N=32

STU-C (V.35)

STU-R (E1) DTEDTE

V.35 SHDSL

Frame N x 64 (N=1~31)

Time slots, N value, are placed in the frame. If time Slot Number is1 from 1~31 (N=1~31), it is Fractional E1. For unframed E1,

the time Slot Number would be set at 32 (N=32).

Fractional E1, PCM31 and PCM31C

For fractional E1(FE1), the data rate can be from 64k(N=1) to 1984k(N=31), according to the E1 framing. If the E1 frame is

PCM31(FAS) or PCM31C(FAS+CRC4), there are 1~31 available time slot for use. 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.

The First Time Slot setting of PCM31(FAS) and PCM31C(FAS+ CRC4) have to follow the rule:

First Time Slot  31 - Time Slot Number