Product specifications

59
STU-C (E1)
STU-R (E1) DTEDTE
E1
E1 SHDSL
Frame E1
Data rate 2048
STU-C (E1)
STU-R
(V.35)
DTEDTE
V.35
E1 SHDSL
Frame N x 64 (N=1~32)
STU-C (V.35)
STU-R (E1) DTEDTE
E1
V.35 SHDSL
Frame N x 64 (N=1~32)
CAS
Also known as time slot 16 multiframing. It requires a multiframe alignment
signal to be present for frame sync. The Multiframe Alignment Signal
(MFAS) is inserted into the 16th timeslot of frame 0 of the 16-frame
multiframe.
In CAS mode, there have 30 channels available for user data. If timeslot 16
is included in the unit’s mapping, it will be disregarded.
PCM30 and PCM30C / FAS+CAS and FAS+CAS+CRC4
CRC4
The CRC-4 checksum bits are transmitted in the outgoing E1 data
stream.
Also the received signal is checked for errors.
CRC-4 checksum cannot be sent in unframed mode.
Unframed
In this mode, user data is inserted into all 32 channels (64k x 32 =
2048k) of the E1 stream. The object of running without framing is to
utilize the full bandwidth of the E1 line.
UNFRAMED
G.703 (E1) can supports data rate of 2048kbps, so the maximum data rate of SHDSL line, connected with E1
DCEs, depends on data rate of E1, 2048kbps.
If the connection is E1 vs V.35 or V.35 vs E1, the framing must use N x 64k. In this case, the data rate
depends on value of N. SHDSL and V35 can support 2304kbps data rate (36 x 64k) but E1 supports
maximum data rate of 2048kbps (32 x 64k).
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.