XRT86VL32IB datasheet(85/154 Pages) EXAR

85 / 154 page

XRT86VL3X

REV. 1.2.3

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

The Transmit Single-frame Synchronization signal of Channel 0 pulses HIGH for one clock cycle at the first bit

position (F-bit of channel 0) 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 (F-bit of Channel 4) 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 DS1 frame. It is 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 XRT86VL3x and sent to each individual channel. These data will be processed by

each individual framer and send to the LIU interface. The local Terminal Equipment provides a free-running

1.544MHz 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 85 shows how to connect

the Transmit multiplexed high-speed Input Interface block to local Terminal Equipment. Figure 89 shows the

timing signal when the transmit framer is running at 12.352 Bit-Multiplexed Mode

FIGURE 85. INTERFACING XRT86VL3X TRANSMIT TO LOCAL TERMINAL EQUIPMENT USING 16.384MBIT/S, HMVIP

16.384MBIT/S, AND H.100 16.384MBIT/S

TxSER0

TxINCLK0 (12/16MHz)

TxSYNC0

TxSERCLK0 (1.544MHz)

Transmit

Payload

Data Input

Interface

Chn 0

Transmit

Payload

Data Input

Interface

Chn 4

Terminal

Equipment

XRT86VL38

Chn 1

Chn 2

Chn 3

Chn 5

Chn 6

Chn 7

TxSERCLK1 (1.544MHz)

TxSERCLK2 (1.544MHz)

TxSERCLK3 (1.544MHz)

TxSER4

TxINCLK4 (12/16MHz)

TxSYNC4

TxSERCLK4 (1.544MHz)

TxSERCLK5 (1.544MHz)

TxSERCLK6 (1.544MHz)

TxSERCLK7 (1.544MHz)

XRT86VL32IB Datasheet(PDF) 85 Page - Exar Corporation

XRT86VL32IB Datasheet(HTML) 85 Page - Exar Corporation

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