TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Data Sheet
June 2002
516
Agere Systems Inc.
21 28-Channel Framer Block Functional Description
(continued)
21.22 Facility Data Link
21.22.1 Facility Data Link References/Standards
ANSI
T1.403-1995—Bit-Oriented Messages (BOM).
21.22.2 Receive Data Link Functional Description
This block extracts facility data links bits and stores them in a microprocessor access register bank:
I
D bits from the
SLC
-96 multisuperframe.
I
Sa bits from time slot 0 in CEPT basic and CRC-4 multiframes.
I
Data link bits from DDS frames.
The respective bits will always be extracted from the framed aligned receive line payload and stored in the facility
data link stack, regardless of other configuration bits. The processor will have control of being alerted to stack
updates through the interrupt mask registers.
All frame types:
I
Support clear-on-read status and interrupt bits based on the setting of the input select signal.
21.22.3
SLC
-96 Superframe Receive Data Link
I
Delineates the
SLC
-96 data link in the Fs signaling frame, extracts the 24 D bits, and stores in the internal mem-
ory stack.
I
Provides interrupt for stack ready.
I
Provides host access to stack using processor clock.
I
Supports loss of frame status.
Both basic frame alignment and multiframe alignment must be established before the data can be assumed valid.
The
SLC
-96 Fs bits are stored in the Rx stack as follows.
Table 601. Shared Rx Stack Format for
SLC
-96 Frames
* The value held in the bits left blank should be ignored by the host.
When the entire stack has been filled, the host is notified using the Rx stack ready interrupt. After the Rx stack
ready interrupt bit is set, the host has approximately 9 ms to read the stack.
21.22.4 DDS Receive Data Link Stack
I
Extracts data link bit (bit 6) from time slot 24 and stores into stack.
I
Provides interrupt for stack ready.
I
Provides host access to stack using the processor clock to provide fast access.
I
Supports loss of frame status.
Word
0
1*
2*
3*
4*
15
0
C1
SB2
0
0
14
0
C2
SB3
0
0
13
0
C3
M1
0
0
12
1
C4
M2
0
0
11
1
C5
M3
0
0
10
1
C6
A1
0
0
9
0
8
0
7
0
6
1
5
1
4
1
3
0
0
0
0
0
2
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
C7
A2
0
0
C8
S1
0
0
C9
S2
0
0
C10
S3
0
0
C11
S4
0
0
SB1
SB4
0
0