peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 109

• Manufacturer Part Number: peb3456
• Description: Channelized T3 Termination With Ds3 Framer, M13 Multiplexer, T1/ E1 Framers And 256 Channel Hdlc/ppp Controller
• Manufacturer: Infineon Technologies Corporation

frame alignment pattern (F-bit) and the multiframe alignment pattern (M-bit).
Loss of frame is declared, when 2 out of 4 or 3 out of 5 incorrect F-bits are found or when
one or more incorrect M-bits are found in 3 out of 4 subframes.
assigned to the 1
tributary DS1 signal and so forth.
Table 4-11
F
X
M
C
[48]
4.9.1.1
The integrated DS2 framer searches for the frame alignment pattern ’01’ and the
multiframe alignment pattern in each of the seven DS2 frames which are contained in a
DS3 signal. Frame alignment is declared, when the DS2 framer has found the basic
Data Sheet
Multiframe
0
11
0
, F
, M
F
subframe in block 3 and 6. F
subframe.
This bit is the forth bit of the multiframe alignment signal and can be set to either ’0’ or ’1’. It is
accessible via an internal register.
M
and they are located in bit 0 of each subframe. The multiframe alignment signal is ’011-’.
The C-bits control the bit stuffing procedure of the multipexed DS1 signals.
These bits represent a data block, which consists of 48 bits. [48] consists of four time slots of 12
bit and each time slot is assigned to one of four participating DS1 signals.
..C
DS2-
0
0
1
and F
1
and M
43
,M
X
1
1
Synchronization Procedure
Subframe
form the frame alignment pattern. Each DS2 frame consists of eight F-bits, two per
and M
M12 multiplex format
1
2
3
4
st
X
form the multiframe alignment signal. Each subframe consists of four M-bits
tributary DS1 signal, the second time slot is assigned to the 2
0
1
1
X
M
M
M
1
[48] C
[48] C
[48] C
[48] C
0
and F
1
11
21
31
41
form the pattern ’01’. This pattern is repeated in every
Block 1 through 6 of a subframe
2
[48] F
[48] F
[48] F
[48] F
109
0
0
0
0
3
[48] C
[48] C
[48] C
[48] C
12
22
32
42
4
[48] C
[48] C
[48] C
[48] C
Functional Description
13
23
33
43
5
[48] F
[48] F
[48] F
[48] F
PEB 3456 E
1
1
1
1
05.2001
6
[48]
[48]
[48]
[48]
nd