DS3181 Maxim Integrated Products, DS3181 Datasheet - Page 156

• 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 10-34. E3 PLCP Frame Format
Figure 10-35. E3 PLCP G1 Byte Format
10.8.7.1 Transmit E3 PLCP Trailer Generation
E3 PLCP trailer generation inserts the E3 PLCP frame trailer immediately following sub-frame 0 (POI equals 01h),
and generates the C1 byte. The trailer size is determined by the phase relationship of the G.751 E3 frame and
PLCP frame and by the transmit 8 kHz reference clock. The trailer size is variable in all frames. The trailer size can
be 17, 18, 19, 20, or 21 bytes. C1 is set to 3Bh, 4Fh, 75h, 9Dh, or A7h respectively, and the indicated number of
bytes (17 – 21) are added after sub-frame 0. The trailer bytes are all set to 11001100.
10.8.7.2 Transmit E3 PLCP Frame Generation
E3 PLCP frame generation receives the incoming PLCP payload data stream, and overwrites all of the overhead
byte locations.
The first two bytes of each sub-frame are overwritten with the frame alignment bytes A1 and A2, which have a
value of F6h and 28h respectively.
The third byte of sub-frame # is overwritten with POI byte # (P#). The value of P# is 00####0Pb (0 = a logic zero,
#### = the hexadecimal value of #, and P = the odd parity bit).
The fourth byte of sub-frames #8 – 6 are overwritten with the Z3 – Z1 bytes from the corresponding registers.
A1
A1
A1
A1
A1
A1
A1
A1
A1
MSB
REI
1
A2
A2
A2
A2
A2
A2
A2
A2
A2
REI - Remote Error Indicator
RAI - Remote Alarm Indicator
LSS - Link Status Signal
REI
P8
P7
P6
P5
P4
P3
P2
P1
P0
REI
M2
M1
Z3
Z2
Z1
B1
G1
C1
F1
REI
G1
RAI
LSS
LSS
57 Columns
Seventh Cell
Second Cell
Fourth Cell
Third Cell
Ninth Cell
Eight Cell
Sixth Cell
Fifth Cell
LSB
LSS
First Cell
8
156
18 or 20
Trailer
Bytes
9 Rows