82V2608BB IDT, Integrated Device Technology Inc, 82V2608BB Datasheet - Page 21
82V2608BB
Manufacturer Part Number
82V2608BB
Description
Manufacturer
IDT, Integrated Device Technology Inc
Datasheet
1.82V2608BB.pdf
(98 pages)
Specifications of 82V2608BB
Utopia Level
Level 2
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
2.97V
Operating Supply Voltage (max)
3.63V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Package Type
BGA
Pin Count
208
Mounting
Surface Mount
Lead Free Status / Rohs Status
Not Compliant
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Spaced Mapping
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
IDT82V2608
INTERFACE
In this mode, T1 to E1 mapping makes every fourth time slot unas-
1.5 M T1
Stream
1.5 M T1
stream
2 M E1
stream
Stream
2 M
F
time slot
Framing
F
A
A
E1
F
u
0
X
A
0
1
1. X=unused bits
2. u=unassigned time slot
3. F
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.
1. X=unused bit
2. u=unassigned time slot
3. F
1
1
X
1
2
A
A
, F
, F
2
2
X
2
B
B
3
and F
and F
X
3
4
C
C
X
are T1 framing bits for frame A, B and C respectively.
4
are T1 framing bits for frame A, B and C respectively.
u
5
Frame A
X
14 15 16 17 18
14 15 16 17 18
5
6
Frame A
Figure-6 Spaced Mapping Mode
Figure-5 G.802 Mapping Mode
X
6
signalling
time slot
7
E1
u
7
8
u
8
9
9
21
F
22
B
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.
23 24 F
X
23 24 F
24 25 26 27 28
27 28
X
u
X
B
F
B
B
29
X
1
X
1
u
30
X
2
X
2
u
31
X
Frame B
Frame B
X
u
0
X
X
1
31
Inverse Multiplexing for ATM
u
23 24 F
X
23 24 F
2
u
0
X
1
X
C
December 4, 2006
C
2
1
31
1
2
2
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