Description
The CS61581 is a primary rate line interface unit capable of operation in both short haul (intraoffice) and long haul applications. The CS61581 combines the complete analog transmit and receive circuitry for a single, full-duplex interface at T1 and E1 rates. The device is pin and function compatible with the Level One LXT310 and LXT318 (the latter in the host mode only). The device can also replace LXT359 and LXT360. Enhanced functionality is available through an extended register set allowing short haul operation, custom pulse shape generation, QRSS pattern generation, detection and error counting, and generation and detection of loop up and loop down codes. The CS61581 features Crystal® low-power impedance-matched line drivers and crystalless jitter attenuation.

Features
● Provides T1 and E1, Long Haul and Short Haul Line Interface
● Provides a QRSS Test Signal and Error Detector
● Impedance Matching Line Driver Using a Single Transformer
● Greater than 14 dB of Transmit Return Loss Without Using External Resistors
● No Crystal Needed for Jitter Attenuation
● Meets AT&T 62411 and TBR 12/13 Jitter Tolerance and Attenuation Requirements
● Meets ANSI T1.231B and ITU-T G.775 Requirements for LOS and AIS
● Meets the BS6450 Transmitter Short-Circuit Requirements for E1 Applications
● Compliant with:
    – ITU-T Recommendations: G.703, G.732, G.775 and I.431
    – American National Standards (ANSI): T1.102, T1.105, T1.403, T1.408, and T1.231
    – FCC Rules and Regulations: Part 68 and Part 15
    – AT&T Publication 62411
    – ETSI ETS 300 011, 300 233, TBR 12/13
    – TR-NET-00499