DS3170 Maxim Integrated Products, DS3170 Datasheet - Page 84

• Manufacturer Part Number: DS3170
• Description: Network Controller & Processor ICs DS3-E3 Single-Chip T ransceiver T3-E3 Fra
• Manufacturer: Maxim Integrated Products

FEBE errors (C-bit format only) are determined by the C-bits in subframe four (C
indicates no error and any other value indicates an error.
The receive alarm indication (RAI) bit will be set high in the transmitter when one or more of the indicated alarm
conditions is present, and low when all of the indicated alarm conditions are absent. Setting the receive alarm
indication on LOS, SEF, LOF, or AIS is individually programmable (on or off).
The Application Identification Channel (AIC) is stored in a register bit. It is determined from the C
set to one (C-bit format) if the C
format) if the C
must not change when an LOS, OOF, or AIS condition is present.
A FEBE is transmitted by default upon reception of a DS3 frame in which a C-bit parity error or a framing error is
detected and counted.
10.6.5 C-bit DS3 Framer/Formatter
10.6.5.1 Transmit C-bit DS3 Frame Processor
The C-bit DS3 frame format is shown in
Figure 10-13. DS3 Frame Format
Table 10-27
M
M
M
X
X
P
P
1
2
1
2
1
2
3
shows the function of each overhead bit in the DS3 Frame
F
F
F
F
F
F
F
11
21
31
41
51
61
71
11
bit is set to zero in four of the last thirty-one consecutive multiframes. Note: The stored AIC bit
C
C
C
C
C
C
C
11
21
31
41
51
61
71
11
bit is set to one in thirty-one consecutive multiframes. The AIC is set to zero (M23
F
F
F
F
F
F
F
12
22
32
42
52
62
72
Figure
680 Bits
10-13.
C
C
C
C
C
C
C
12
22
32
42
52
62
72
84 of 230
F
F
F
F
F
F
F
13
23
33
43
53
63
73
DS3170 DS3/E3 Single-Chip Transceiver
C
C
C
C
C
C
C
13
23
33
43
53
63
73
41
, C
F
F
F
F
F
F
F
42
14
24
34
44
54
64
74
, and C
43
). A value of 111
11
bit. The AIC is
7 Sub-
Frames