DS3181 Maxim Integrated Products, DS3181 Datasheet - Page 152

• 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

Figure 10-32. DS3 PLCP Frame Format
Figure 10-33. DS3 PLCP G1 Byte Format
10.8.5.1 Transmit DS3 PLCP Trailer Generation
DS3 PLCP trailer generation inserts the DS3 PLCP frame trailer immediately following sub-frame 0 (POI equals
01h), and generates the C1 byte. The trailer size is determined by the DS3 PLCP superframe counter, and the 8
kHz reference clock. The DS3 PLCP superframe counter is a free running counter that indicates the current frame
of the three-frame superframe. In the first frame of the superframe, the trailer size is set to 13, and C1 is set to FFh.
In the second frame of the superframe, the trailer size is set to 14, and C1 is set to 00h. In the third frame of the
superframe, the trailer size is variable. The trailer size is controlled by the 8kHz reference clock. If the indicated
trailer size is 13, C1 is set to 66h. If the indicated trailer size is 14, C1 is set to 99h, and the indicated number of
nibbles (13 or 14) are added after sub-frame 0. The trailer nibbles are all set to 1100.
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
A1
MSB
REI
1
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
A2
REI - Remote Error Indicator
RAI - Remote Alarm Indicator
LSS - Link Status Signal
REI
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
M2
M1
G1
C1
Z6
Z5
Z4
Z3
Z2
Z1
F1
B1
REI
REI
G1
RAI
LSS
Subframe (57 Bytes)
LSS
Eleventh Cell
Seventh Cell
Twelfth Cell
Second Cell
Fourth Cell
Third Cell
Tenth Cell
Ninth Cell
Eight Cell
Sixth Cell
First Cell
Fifth Cell
LSB
LSS
8
152
13 or 14
Nibbles
Trailer
Subframes
12