Spaced Mapping In this mode, T1 to E1 mapping" />
參數(shù)資料
型號: IDT82V2604BBG
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 13/97頁
文件大?。?/td> 0K
描述: IC INVERSE MUX 4CH ATM 208-BGA
標(biāo)準(zhǔn)包裝: 1
應(yīng)用: 無線
接口: Utopia
電源電壓: 2.97 V ~ 3.63 V
封裝/外殼: 208-BGA
供應(yīng)商設(shè)備封裝: 208-PBGA(17x17)
包裝: 托盤
安裝類型: 表面貼裝
其它名稱: 82V2604BBG
INTERFACE
20
December 4, 2006
IDT82V2604
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 framing bit is assigned
to the first bit of TS0. This distribution of unassigned time slots averages
out the idle time slots and optimizes the framer’s slip buffer’s usage.
Figure-6 Spaced Mapping Mode
1.5 M T1
stream
2 M E1
stream
FA
1
2
14 15 16 17 18
23 24
FB
1
2
23 24
FC
1
2
0
1
14 15 16 17 18
2
24 25 26 27 28
31
0
1
2
FB
X
E1
Framing
time slot
E1
signalling
time slot
u
uu
u
Frame A
Frame B
1. X=unused bit
2. u=unassigned time slot
3. FA, FB and FC are T1 framing bits for frame A, B and C respectively.
1.5 M T1
Stream
2 M
Stream
FA
1
2
5
6
7
8
9
23 24
FB
1
2
23 24 FC
1
2
0
1
7
8
9
2
27 28
31
Frame A
Frame B
1. X=unused bits
2. u=unassigned time slot
3. FA, FB and FC 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
FB
X
0
1
2
FA
X
4
5
4
u
6
30
29
u
22
u
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