MT9076B Datasheet, PDF (32/172 Pages) Zarlink Semiconductor Inc – T1/E1/J1 3.3 V Single Chip Transceiver

MT9076B
Data Sheet
Frame #
21
22
23
24
FPS
FDL
CRC
X
CB6
X
1
Table 8 - ESF Superframe Structure (T1) (continued)
Signaling
D
Frame # Ft
1
1
2
3
0
4
5
1
6
7
0
8
9
1
10
11
0
12
13
1
14
15
0
16
17
1
18
19
0
20
21
1
22
23
0
24
Fs Notes Frame # Ft Fs Notes Frame # Ft Fs
Notes
25
1
C
49
1
0R
26
Xo
50
S
S = Spoiler Bits
e
27
0
n
51
0
0
s
28
Xc
52
S
y
29
1
e
53
1
0
n
30
Xn
54
C C = Maintenance Field Bits
c
31
0
t
55
0
1
h
32
X
r
56
C
r
33
1
a
57
1
1
o
34
X
t
58
C
n
35
0
o
59
0
1
i
36
X
r
60
A
A = Alarm Field Bits
z
37
1
61
1
0
a
38
XF
62
A
t
39
0
i
63
0
0
i
40
Xe
64
L L = Line Switch Field Bits
o
41
1
l
65
1
0
n
42
Xd
66
L
43
0
67
0
1
d
44
XB
68
L
a
45
1
i
69
1
1
t
46
X
t
70
L
a
47
0
s
71
0
1
48
S
72
S
S = Spoiler Bits
Table 9 - SLC-96 Framing Structure(T1)
3.3 E1 Digital Interface
PCM 30 (E1) basic frames are 256 bits long and are transmitted at a frame repetition rate of 8000 Hz, which results
in an aggregate bit rate of 256 bits x 8000/sec = 2.048 Mbits/sec. The actual bit rate is 2.048 Mbits/sec +/-50 ppm
encoded in HDB3 format. The HDB3 control bit (page 01H, address 15H, bit 5) selects either HDB3 encoding or
alternate mark inversion (AMI) encoding. Basic frames are divided into 32 time slots numbered 0 to 31, see
Figure 43 on page 168. Each time slot is 8 bits in length and is transmitted most significant bit first (numbered bit 1).
This results in a single time slot data rate of 8 bits x 8000/sec. = 64 kbits/sec.
It should be noted that the Zarlink ST-BUS also has 32 channels numbered 0 to 31, but the most significant bit of an
eight bit channel is numbered bit 7 (see Zarlink Application Note MSAN-126). Therefore, ST-BUS bit 7 is
synonymous with PCM 30 bit 1; bit 6 with bit 2: and so on (Figure 44).
PCM 30 time slot 0 is reserved for basic frame alignment, CRC-4 multiframe alignment and the communication of
maintenance information. In most configurations time slot 16 is reserved for either Channel Associated signaling
32
Zarlink Semiconductor Inc.