DESCRIPTION
The IDT82P20516 is a 16-channel high-density E1 short haul Line Interface Unit. Each channel of the IDT82P20516 can be independently configured. The configuration is performed through a Serial microprocessor interface.

FEATURES
♦ Integrates 16 channels E1 short haul line interface units for 120 Ω E1 twisted pair cable and 75 Ω E1 coaxial cable applications
♦ Per-channel configurable Line Interface options
   • Fully integrated and software selectable receive and transmit termination
     – Option 1: Fully Internal Impedance Matching with integrated receive termination resistor
     – Option 2: Partially Internal Impedance Matching with common external resistor for improved device power dissipation
     – Option 3: External impedance Matching termination
   • Supports global configuration and per-channel configuration to E1 mode
♦ Per-channel programmable features
   • Provides E1 short haul waveform templates and user programmable arbitrary waveform templates
   • Provides two JAs (Jitter Attenuator) for each channel of receiver and transmitter
   • Supports AMI/HDB3 (for E1) encoding and decoding
♦ Per-channel System Interface options
   • Supports Single Rail, Dual Rail with clock or without clock and sliced system interface
   • Integrated Clock Recovery for the transmit interface to recover transmit clock from system transmit data
♦ Per-channel system and diagnostic functions
   • Provides transmit driver over-current detection and protection with optional automatic high impedance of transmit interface
   • Detects and generates PRBS (Pseudo Random Bit Sequence), ARB (Arbitrary Pattern) and IB (Inband Loopback) in either receive or transmit direction
   • Provides defect and alarm detection in both receive and transmit directions.
     – Defects include BPV (Bipolar Violation) /CV (Code Violation) and EXZ (Excessive Zeroes)
     – Alarms include LLOS (Line LOS), SLOS (System LOS), TLOS (Transmit LOS) and AIS (Alarm Indication Signal)
   • Programmable LLOS detection /clear levels. Compliant with ITU and ANSI specifications
   • Various pattern, defect and alarm reporting options
     – Serial hardware LLOS reporting (LLOS, LLOS0) for all 16 channels
     – Register access to individual registers or 16-bit error counters
   • Supports Analog Loopback, Digital Loopback and Remote Loopback
   • Supports line monitor
♦ Hitless Protection Switching (HPS) without external Relays
   • Supports 1+1 and 1:1 hitless protection switching
   • Asynchronous hardware control (OE, RIM) for fast global high impedance of receiver and transmitter (hot switching between working and backup board)
   • High impedance transmitter and receiver while powered down
   • Per-channel register control for high impedance, independent for receiver and transmitter
♦ Clock Inputs and Outputs
   • Flexible master clock (N x 1.544 MHz or N x 2.048 MHz) (1 ≤ N ≤ 8, N is an integer number)
   • Integrated clock synthesizer can multiply or divide the reference clock to a wide range of frequencies: 8 KHz, 64 KHz, 2.048 MHz, 4.096 MHz, 8.192 MHz, 19.44 MHz and 32.768 MHz
♦ Microprocessor Interface
   • Supports Serial microprocessor interface
♦ Other Key Features
   • IEEE1149.1 JTAG boundary scan
   • Two general purpose I/O pins
   • 3.3 V I/O with 5 V tolerant inputs
   • 3.3 V and 1.8 V power supply
   • Package: 484-pin Fine Pitch BGA (19 mm X 19 mm)
♦ Applicable Standards
   • Bellcore TR-TSY-000009, GR-253-CORE and GR-499-CORE
   • ETSI CTR12/13
   • ETS 300166 and ETS 300 233
   • G.703, G.735, G.736, G.742, G.772, G.775, G.783 and G.823
   • O.161

APPLICATIONS
♦ SDH/SONET multiplexers
♦ Central office or PBX (Private Branch Exchange)
♦ Digital access cross connects
♦ Remote wireless modules
♦ Microwave transmission systems