RS8953 Conexant Systems, Inc., RS8953 Datasheet - Page 53

• Manufacturer Part Number: RS8953
• Description: High-bit-rate Digital Subscriber Line (hdsl) Channel unit
• Manufacturer: Conexant Systems, Inc.

RS8953B/8953SPB
HDSL Channel Unit
Figure 3-16. 2T1 Frame Format
N8953BDSB
S
Q
1
S
Q
2
0
MS
S
W
7
YNC
ORD
Q
1/392
1
H
O
H
Q
MS
B
0
1
B
0
2
12
CH1
CH2
X
48.5 = 582
are replaced by F-bits and are treated as payload with respect to the PCM channel.
Figure 3-16
payload block contains 1 F-bit, plus 12 payload bytes. The figure also illustrates
F-bits routed as payload to both HDSL channels and demonstrates the order in
which PCM timeslots are routed to payload bytes: bytes 1 through 12 correspond
to PCM timeslots 1–12 routed on CH1, bytes 13 through 24 correspond to PCM
timeslots 13–24 routed on CH2. CH3 is unused in 2T1 application.
and
bytes in each HDSL channel, as shown by byte numbering. The 2E1 payload
block contains 18 payload bytes, and the 3E1 payload block contains 12 bytes. In
E1 framing mode [E1_MODE = 1 in CMD_1; addr 0xE5], 48 Z-bits are treated as
overhead and are under MPU control. (Refer to
Table 3-3
In T1 framing mode [E1_MODE = 0 in CMD_1; addr 0xE5], Z-bit positions
Standard application 2E1 and 3E1 frame formats are shown in
B
1
2
1
Figure
F
F
Q
B
5
H
O
H
Q
BYTE
8-
BYTE
B
1
3
BITS
shows additional examples of frame mapping options.
3-18, respectively. Standard mapping of PCM data places alternating
13
1
shows a standard application 2T1 frame format in which each
B
1
4
BYTE
582
BYTE
Q
14
2351
97/784
Conexant
2
B
NN
2T1 F
B
2
4
OR
BYTE
BYTE
MS
5
H
O
H
2353
RAME
Q
15
3
B
2
5
QUATS
B
2
6
582
Q
BYTE
BYTE
B
3
6
12
24
5
H
O
H
Q
Table 3-5
LEGEND:
B
3
7
B
HOH = HDSL
SQ
B
3
8
NN
N
= P
= S
582
AYLOAD
for Z-bit definitions).
TUFF QUAT
Q
3.0 Circuit Descriptions
OVERHEAD
B
4
8
“6-”
B
LOCKS
S
Q
1
6
3.5 HDSL Channel
0,2
Figure 3-17
MS
S
Q
2
Q
“6+”
1-48
S
W
YNC
ORD
3-21