The DS2149 is a complete T1 line interface unit (LIU) for short-haul and long-haul applications. Receive sensitivity adjusts automatically to the incoming signal and can be limited to -18dB, -26dB, or -36dB. The device can generate the necessary DSX-1 line build-outs or CSU line build-outs of 0dB, -7.5dB,
-15dB, and -22.5dB. The on-board crystal-less jitter attenuator requires a 1.544MHz reference clock. The jitter attenuator FIFO is selectable to either 32 bits or 128 bits in depth and can be placed in either the transmit or receive data paths. The DS2149 has diagnostic capabilities such as loopbacks and QRSS pattern generation and detection. The device can also generate and detect the in-band loop-up and loop-down codes specified in AT&T 62411. The device can be configured for control using a serial interface, or for hardware mode. The device fully meets all of the latest T1 specifications including ANSI T1.102-1999, ANSI T1.403-1999, ANSI T1.408, and AT&T 62411.
Key Features
Applications/Uses
Fully integrated line interface unit (LIU)
Pin compatible with LXT362
Supports both long haul and short haul
Crystal-less jitter attenuator
Jitter attenuator programmable for transmit or receive path
Meets ANSI T1.102, T1.403, T1.408, AT&T 62411
Usable receive sensitivity of 0dB to -36dB, which allows the device to operate on 0.63mm (22AWG) cables up to 6k feet in length
Five line build-out settings for short-haul applications
Four CSU filters from 0dB to -22.5dB
Transmit/receive performance monitors with driver-fail, monitor-open and loss-of-signal outputs
Bipolar or NRZ interface
Programmable B8ZS encoder/decoder
QRSS generator/detector
Local, remote, and analog loopbacks
Generates and detects in-band loop-up and loop-down codes
Serial interface provides access to control registers
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