DS3181 Maxim Integrated Products, DS3181 Datasheet - Page 173

• Manufacturer Part Number: DS3181
• Description: Network Controller & Processor ICs DS3-E3 ATM-Packet PH Y with Built-in Line
• Manufacturer: Maxim Integrated Products

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

10.10.6.5 Transmit M23 DS3 AIS/Idle Generation
M23 DS3 AIS/Idle generation overwrites the data stream with AIS or an Idle signal. If transmit Idle is enabled, the
data stream payload is forced to an 1100 pattern with two ones immediately following each DS3 overhead bit. M
M
overwritten with the values one, zero, zero, and one (1001) respectively. X
P
are overwritten with 000.
If transmit AIS is enabled, the data stream payload is forced to a 1010 pattern with a one immediately following
each DS3 overhead bit. M
F
are overwritten with 11. P
And, C
10.10.6.5.1 Receive M23 DS3 Frame Format
The DS3 frame format is shown in
referred to as the far-end SEF/AIS bits). P
are the multiframe alignment bits that define the multiframe boundary. F
define the sub-frame boundary. Note: Both the M-bits and F-bits define the DS3 frame boundary. C
Application Identification Channel (AIC). C
10.10.6.5.2 Receive M23 DS3 Overhead Extraction
Overhead extraction extracts all of the DS3 overhead bits from the M23 DS3 frame. All of the DS3 overhead bits
X
P
the Application Identification Channel (AIC) is extracted from the C
one (C-bit format) if the C
the C
when a LOS, OOF, or AIS condition is present.
10.10.6.5.3 Receive DS3 Downstream AIS Generation
Downstream DS3 AIS (all ‘1’s) can be automatically generated on an OOF, LOS, or AIS condition or manually
inserted. If automatic downstream AIS is enabled, downstream AIS is inserted when an LOS or AIS condition is
declared, or no earlier than 2.25 ms and no later than 2.75 ms after an OOF condition is declared. Automatic
downstream AIS is programmable (on or off). If manual downstream AIS insertion is enabled, downstream AIS is
inserted. Manual downstream AIS insertion is programmable (on or off). Downstream AIS is removed when all
OOF, LOS, and AIS conditions are terminated and manual downstream AIS insertion is disabled.
X1
2
1
1
2
, X
, and M
and P
are overwritten with the calculated payload parity from the previous output DS3 frame. And, C
, F
2
11
X2
, P
X1
, F
bit is set to zero in four of the last 31 consecutive multiframes. Note: The stored AIC bit must not change
, C
1
2
, P
3
X3
bits are output as an error indication (modulo 2 addition of the calculated parity and the bit). In addition,
X2
bits are overwritten with the values zero, one, and zero (010) respectively. F
, and F
2
, M
, and C
X
, F
X4
XY
X3
, and C
bits are overwritten with the values one, zero, zero, and one (1001) respectively. X
are overwritten with 000. AIS will overwrite a transmit Idle signal.
1
11
1
, M
and P
bit is set to one in 31 consecutive multiframes. The AIC is set to zero (M23 format) if
XY
2
, and M
are output on the receive overhead interface (ROH, ROHSOF, and ROHCLK). The
2
are overwritten with the calculated payload parity from the previous DS3 frame.
Figure
3
bits are overwritten with the values zero, one, and zero (010) respectively.
X1
1
10-40. The X
and P
, C
X2
, and C
2
are the parity bits used for line error monitoring. M
173
X3
1
and X
are the stuff control bits for tributary #X.
2
are the Remote Defect Indication (RDI) bits (also
11
bit and stored in a register. The AIC is set to
XY
1
and X
are the sub-frame alignment bits that
2
are overwritten with 11.. P
X1
, F
X2
, F
X3
, and F
31
, C
1
, M
32
X4
, and C
2
11
1
, and M
bits are
and X
is the
1
and
33
1
2
3
,