参数资料
型号: IDT82V2608
厂商: Integrated Device Technology, Inc.
英文描述: INVERSE MULTIPLEXING FOR ATM
中文描述: 反向复用的ATM
文件页数: 21/98页
文件大小: 398K
代理商: IDT82V2608
INTERFACE
21
December 4, 2006
IDT82V2608
Inverse Multiplexing for ATM
Figure-5 G.802 Mapping Mode
Spaced Mapping
In this mode, T1 to E1 mapping makes every fourth time slot unas-
signed (i.e., 4, 8, 12, 16, 20, 24 and 28). Refer to
Figure-6
. Suppose T1
time slot x is mapped to E1 time slot y. We have y=x+int((x-1)/3), where
int(n) is the largest integer no greater than n. The framng bit is assigned
to the first bit of TS0. This distribution of unassigned time slots averages
out the idle time slots and optimzes the framer’s slip buffer’s usage.
Figure-6 Spaced Mapping Mode
1.5 M T1
stream
2 M E1
stream
F
A
1
2
14 15 16 17 18
23 24
F
B
1
2
23 24
F
C
1
2
0
1
14 15 16 17 18
2
24 25 26 27 28
31
0
1
2
F
B
X
X
X
X
X
X
X
E1
Framing
time slot
E1
signalling
time slot
u
u
u
u
u
u
u
Frame A
Frame B
1. X=unused bit
2. u=unassigned time slot
3. F
A
, F
B
and F
C
are T1 framing bits for frame A, B and C respectively.
1.5 M T1
Stream
2 M
Stream
F
A
1
2
5
6
7
8
9
23 24
F
B
1
2
23 24 F
C
1
2
0
1
7
8
9
2
27 28
31
31
Frame A
Frame B
1. X=unused bits
2. u=unassigned time slot
3. F
A
, F
B
and F
C
are T1 framing bits for frame A, B and C respectively.
4. Mapping rule: If T1 time slot x is mapped to E1 time slot y, y = x+int(x/3). Here int(n) is
the largest integer no greater than n.
3
3
F
B
X
X
X
X
X
X
X
0
1
2
F
A
X
X
X
X
X
X
X
4
5
4
u
6
30
29
u
22
u
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