DS3181 Maxim Integrated Products, DS3181 Datasheet - Page 165
DS3181
Manufacturer Part Number
DS3181
Description
Network Controller & Processor ICs DS3-E3 ATM-Packet PH Y with Built-in Line
Manufacturer
Maxim Integrated Products
Datasheet
1.DS3184DK.pdf
(400 pages)
Specifications of DS3181
Product
Framer
Number Of Transceivers
1
Data Rate
44.736 Mbps
Supply Voltage (max)
3.465 V
Supply Voltage (min)
3.135 V
Supply Current (max)
280 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Package / Case
TEBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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boundary is found, the multiframe frame boundary can be found. The multiframe boundary is found by identifying
the multiframe alignment bits M
framer is an off-line framer that only updates the data path frame counters when either an out of frame (OOF) or an
out of multiframe (OOMF) condition is present. The use of an off-line framer reduces the average time required to
reframe, and reduces data loss caused by burst error. The DS3 framer has a Maximum Average Reframe Time
(MART) of approximately 1.0ms.
Figure 10-40. DS3 Frame Format
The sub-frame framer continually searches four adjacent bit positions for a sub-frame boundary. A sub-frame
alignment bit (F-bit) checker checks each bit position. All four-bit positions must fail before any other bit positions
are checked for a sub-frame boundary. There are 170 possible bit positions that must be checked, and four
positions are checked simultaneously. Therefore up to 43 checks may be needed to identify the sub-frame
boundary. The sub-frame framer enables the multiframe frame once it has identified a sub-frame boundary. See
Figure 10-41
M
M
M
X
X
P
P
1
2
1
2
1
2
3
for the sub-frame framer state diagram.
F
F
F
F
F
F
F
11
21
31
41
51
61
71
C
C
C
C
C
C
C
11
21
31
41
51
61
71
1
, M
2
, and M
F
F
F
F
F
F
F
12
22
32
42
52
62
72
3
, which have a value of zero, one, and zero respectively. The DS3
680 Bits
C
C
C
C
C
C
C
12
22
32
42
52
62
72
165
F
F
F
F
F
F
F
13
23
33
43
53
63
73
C
C
C
C
C
C
C
13
23
33
43
53
63
73
F
F
F
F
F
F
F
14
24
34
44
54
64
74
7 Sub-
Frames
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