XRT86L30
SINGLE T1/E1/J1 FRAMER/LIU COMBO
REV. 1.0.1
SIXTH OCTET OF 16.384MBIT/S DATA STREAM
B
IT
0
B
IT
1
B
IT
2
B
IT
3
B
IT
4
4
4
B
IT
5
5
5
B
IT
6
6
6
B
IT
7
7
7
60
B0
61
B1
62
B2
63
B3
SEVENTH OCTET OF 16.384MBIT/S DATA STREAM
B
IT
0
B
IT
1
B
IT
2
B
IT
3
B
IT
B
IT
B
IT
B
IT
70
C0
71
C1
72
C2
73
C3
EIGHTH OCTET OF 16.384MBIT/S DATA STREAM
B
IT
0
B
IT
1
B
IT
2
B
IT
3
B
IT
B
IT
B
IT
B
IT
80
D0
81
D1
82
D2
83
D3
XY: The Xth payload bit of Channel Y
AY: The signaling bit A of Channel Y
3. After the first octet of all four channels are sent, the local Terminal Equipment start sending the second
octets following the same rules of Step 1 and 2.
The Transmit Single-frame Synchronization signal of Channel 0 pulses HIGH for one clock cycle at the first bit
position of the multiplexed data stream with data from Channel 0-3 multiplexed together. The Transmit Single-
frame Synchronization signal of Channel 4 pulses HIGH for one clock cycle at the first bit position of the data
stream with data from Channel 4-7 multiplexed together. By sampling the HIGH pulse on the Transmit Single-
frame Synchronization signal, the framer can position the beginning of the multiplexed E1 frame. It is the
responsibility of the Terminal Equipment to align the multiplexed transmit serial data with the Transmit Single-
frame Synchronization pulse.
Inside the framer, all the "don't care" bits will be stripped away. The framing bits, signaling and payload data are
de-multiplexed inside the XRT86L30 device and send to each individual channel. These data will be processed
by each individual framer and send to LIU interface. The local Terminal Equipment provides a free-running
2.048MHz clock to the Transmit Serial Input clock of each channel. The framer will use this clock to carry the
processed payload and signaling data to the transmit section of the device. Figure 72 shows how to connect
the Transmit multiplexed high-speed Input Interface block to local Terminal Equipment. Figure 73 shows how
to connect the Receive multiplexed high-speed Output Interface to local Terminal Equipment.
201
EXAR [ EXAR CORPORATION ]
