XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 286

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT84L38
OCTAL T1/E1/J1 FRAMER
FIRST OCTET OF 16.384MBIT/S DATA STREAM
SECOND OCTET OF 16.384MBIT/S DATA STREAM
X
FIFTH OCTET OF 16.384MBIT/S DATA STREAM
SIXTH OCTET OF 16.384MBIT/S DATA STREAM
SEVENTH OCTET OF 16.384MBIT/S DATA STREAM
2. The local Terminal Equipment also multiplexed signaling bits with payload bits and sent them together
Y
: The Xth payload bit of Channel Y
After the first bits of Timeslot 0 of all four channels are sent, it comes the second bit of Timeslot 0 of
Channel 0 and so on. The table below demonstrates how payload bits of four channels are mapped into
the 16.384Mbit/s data stream.
through the 16.384Mbit/s data stream.
When the Terminal Equipment is sending the fifth payload bit of a particular channel, instead of sending it
twice, it inserts the signaling bit A of that particular channel. Similarly, the sixth payload bit of a particular
channels is followed by the signaling bit B of that channel; the seventh payload bit is followed by the
signaling bit C; the eighth payload bit is followed by the signaling bit D.
The following table illustrates how payload bits and signaling bits are multiplexed together into the
16.384Mbit/s data stream.
B
B
B
B
B
1
2
5
6
7
IT
IT
IT
IT
IT
0
0
0
0
0
0
0
0
0
0
B
B
B
B
B
A
B
C
1
2
IT
IT
IT
IT
IT
0
0
0
0
0
1
1
1
1
1
B
B
B
B
B
1
2
5
6
7
IT
IT
IT
IT
IT
1
1
1
1
1
2
2
2
2
2
B
B
B
B
B
A
B
C
2
1
IT
IT
IT
IT
IT
1
1
1
1
1
3
3
3
3
3
266
B
B
B
B
B
1
2
5
6
7
IT
IT
IT
IT
IT
2
2
2
2
2
4
4
4
4
4
B
B
B
B
B
C
A
B
1
2
IT
IT
IT
IT
IT
2
2
2
2
2
5
5
5
5
5
B
B
B
B
B
1
2
5
6
7
IT
IT
IT
IT
IT
3
3
3
3
3
6
6
6
6
6
REV. 1.0.1
B
B
B
B
B
C
1
2
A
B
IT
IT
IT
IT
IT
3
3
3
3
3
7
7
7
7
7