peb3456 Infineon Technologies Corporation, peb3456 Datasheet - Page 116

• 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

4.10.2
The framing structure of the C-bit parity format is shown in Table 4-13. The assignment
of the information bits [84] is identical to the M23 multiplex format, but the function of the
C-bits is redefined for path maintenance and data link channels.
Table 4-14
F
M
N
AIC
DL
DL
FEAC
FEBE
Data Sheet
frame
Multi-
DS3-
0
r
0
, F
, M
F
subframe in block 2, 4, 6 and 8. F
every subframe.
M
block in subframe 5,6 and 7. The multiframe alignment signal is ’010’.
Reserved. Set to ’1’ in transmit direction.
Application Identification Channel.
t
The terminal-to-terminal path maintenance data link uses the HDLC protocol. Access to the DL
bits is possible via the DS3 transmit and receive FIFO.
Reserved. Set to ’1’ in transmit direction.
The alarm or status information of a far end terminal is sent back over the far end and control
channel. This bit also contains DS3 or DS1 line loopback requests. Messages are sent in bit
oriented mode. Message codes can be accessed via an internal register.
The far end block error bits indicate a CP-bit parity error or a framing error. They are used to
0
0
1
and F
and M
frame
Sub-
1
2
3
4
5
6
7
1
1
C-bit parity format
form the frame alignment pattern. Each DS3 frame consists of 28 F-bits, four per
form the multiframe alignment signal. The M-bit is contained in the OH-bit of the first
M
M
M
C-bit parity format
X [84] F
X [84] F
P [84] F
P [84] F
0
1
0
1
[84] F
[84] F
[84] F
1
1
1
1
1
1
1
2
[84] AIC [84] F
[84] DL [84] F
[84] CP [84] F
[84] FEBE [84] F
[84] DL
[84] DL [84] F
[84] DL [84] F
Block 1 through 8 of a subframe
0
and F
t
3
[84] F
1
form the pattern ’1001’. This pattern is repeated in
116
0
0
0
0
0
0
0
4
[84] N
[84] DL [84] F
[84] CP [84] F
[84] FEBE [84] F
[84] DL
[84] DL [84] F
[84] DL [84] F
r
t
5
[84] F
[84] F
0
0
0
0
0
0
0
Functional Description
6
[84] FEAC [84] F
[84] DL [84] F
[84] CP [84] F
[84] FEBE [84] F
[84] DL
[84] DL [84] F
[84] DL [84] F
t
7
PEB 3456 E
[84] F
05.2001
1
1
1
1
1
1
1
8
[84]
[84]
[84]
[84]
[84]
[84]
[84]
t