XRT83L314IB集成電路（IC）的電信規(guī)格書PDF中文資料

GENERAL DESCRIPTION

The XRT83L314 is a fully integrated 14-channel longhaul and short-haul line interface unit (LIU) that operates from a single 3.3V power supply. Using internal termination, the LIU provides one bill of materials to operate in T1, E1, or J1 mode independently on a per channel basis with minimum external components. The LIU features are programmed through a standard microprocessor interface. EXAR’s LIU has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the LIU is powered off. Key design features within the LIU optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays.

FEATURES

? Fully integrated 14-Channel short haul and long haul transceivers for T1/J1 (1.544MHz) and E1 (2.048MHz) applications.

? T1/E1/J1 short haul, long haul, and clock rate are per port selectable through software without changing components.

? Internal Impedance matching on both receive and transmit for 75? (E1), 100? (T1), 110? (J1), and 120? (E1) applications are per port selectable through software without changing components.

? Power down on a per channel basis with independent receive and transmit selection.

? Five pre-programmed transmit pulse settings for T1 short haul applications.

? Arbitrary pulse generator for T1 and E1 modes.

? Transmit line build outs (LBO) for T1 long haul applications from 0dB to -22.5dB in three -7.5dB steps on a per channel basis.

? On-Chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel basis.

? Independent Crystal-Less digital jitter attenuators (JA) with 32-Bit or 64-Bit FIFO for the receive and transmit paths

? On-Chip frequency multiplier generates T1 or E1 master clocks from a variety of external clock sources (8, 16, 56, 64, 128, 256kHz and 1X, 2X, 4X, 8X T1 or E1)

? Driver failure monitor output (DMO) alerts of possible system or external component problems.

? Transmit outputs and receive inputs may be High impedance for protection or redundancy applications on a per channel basis.

? Support for automatic protection switching.

? 1:1 and 1+1 protection without relays.

? Selectable receiver sensitivity from 0 to 36dB cable loss in T1 @ 772kHz, and 0 to 43dB cable loss in E1 @ 1,024kHz.

? Receive monitor mode handles 0 to 29dB resistive attenuation (flat loss) along with 0 to 6dB cable loss for both T1 and E1.

? Receiver line attenuation indication output in 1dB steps.

? Loss of signal (RLOS) according to ITU-T G.775/ETS300233 (E1) and ANSI T1.403 (T1/J1).

? Programmable receive slicer threshold (45, 50, 55, or 68) for improved receiver interference immunity.

? Programmable data stream muting upon RLOS detection.

? On-Chip HDB3/B8ZS encoder/decoder with an internal 16-bit LCV counter for each channel.

? On-Chip digital clock recovery circuit for high input jitter tolerance.

? QRSS pattern generator and detection for testing and monitoring.

? Error and bipolar violation insertion and detection.

? Transmit all ones (TAOS) and in-band network loop up and loop down code generation.

? Automatic loop code detection for remote loopback activation.

? Supports local analog, remote, digital, and dual loopback modes.

? Low Power dissipation: 170mW per channel (50 density).

? 250mW per channel maximum power dissipation (100 density).

? Single 3.3V supply operation (3V to 5V I/O tolerant).

? 304-Pin TBGA package

? -40°C to +85°C Temperature Range

? Supports gapped clocks for mapper/multiplexer applications.

APPLICATIONS

? T1 Digital Cross Connects (DSX-1)

? ISDN Primary Rate Interface

? CSU/DSU E1/T1/J1 Interface

? T1/E1/J1 LAN/WAN Routers

? Public Switching Systems and PBX Interfaces

? T1/E1/J1 Multiplexer and Channel Banks

? Integrated Multi-Service Access Platforms (IMAPs)

? Integrated Access Devices (IADs)

? Inverse Multiplexing for ATM (IMA)

? Wireless Base Stations