
Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
537
Agere Systems Inc.
21 28-Channel Framer Block Functional Description
(continued)
Table 611. Associated Signaling Mode CHI 2-Byte Time-Slot Format for Stuffed Channels
* The default stuff byte is shown.
21.26.14 CEPT: Time Slot 16 Signaling ASM 2-Byte Time-Slot Format
Table 612
illustrates the ASM time-slot format for valid CEPT E1 time slots.
Table 612. Associated Signaling Mode CHI 2-Byte Time-Slot Format for CEPT
* In the CEPT formats, these bits are undefined.
The P bit is the parity-sense bit calculated over the 8 data bits, the ABCD bits, and the P bit. The identical parity-sense
of the received system
P bit in the transmitted signaling data is echoed back to the system in the received signaling information.
21.26.15 CHI Offset Programming
To facilitate bit offset programming, two parameters are introduced: CEX is defined as the clock edge with which
the first bit of time slot 0 is transmitted; CER is defined as the clock edge on which bit 0 of time slot 0 is latched.
CEX and CER are counted relative to the edge on which the CHIFS signal is sampled. Values of CEX and CER
depend upon the values of the parameters described below.
The following three tables give decimal values of CEX and CER for various values of FRM_CMS (
Table 359 on
page 261
), FRM_TFSCKE (
Table 359
), FRM_RFSCKE (
Table 367 on page 265
), FRM_TOFF[2:0] (
Table 430 on
page 299
), and FRM_ROFF[2:0] (
Table 430
). The byte (time slot) offsets are assumed to be zero in the following
examples.
Table 613. Programming Values for FRM_TOFF[2:0] and FRM_ROFF[2:0] when FRM_CMS = 0
Table 614. Programming Values for FRM_TOFF[2:0] when FRM_CMS = 1
Table 615. Programming Values for FRM_ROFF[2:0] when FRM_CMS = 1
ASM CHI Time Slot
Payload Data*
1
Signaling Information*
1
1
0
1
1
1
1
1
1
0
1
1
1
1
1
CEPT ASM CHI Time Slot
Payload Data
4
Signaling Information
C
D
1
2
3
5
6
7
8
A
B
X*
X*
X*
P
FRM_TFSCKE/
FRM_RFSCKE
0
1
FRM_ROFF[2:0] or FRM_TOFF[2:0]
011
100
6
8
6
8
000
0
0
001
2
2
010
4
4
101
10
10
110
12
12
111
14
14
CER or
CEX
(decimal)
FRM_TFSCKE
FRM_TOFF[2:0]
011
12
12
000
0
0
001
4
4
010
8
8
100
16
16
101
20
20
110
24
24
111
28
28
CEX
(decimal)
0
1
FRM_RFSCKE
FRM_ROFF[2:0]
011
12
12
000
0
0
001
4
4
010
8
8
100
16
16
101
20
20
110
24
24
111
28
28
CER
(decimal)
0
1