Line Interface Unit 640-Pin BGA Tray

The IDT82P2828 is a 21+1 channels high-density T1/E1/J1 shorthaul Line Interface Unit. Each channel of the IDT82P2828 can be independentlyconfigured. The configuration is performed through a Serial orParallel Intel/Motorola Non-Multiplexed /Multiplexed microprocessorinterface. In the receive path, through a Single Ended or Differential line interface,the received signal is processed by an adaptive Equalizer and thensent to a Slicer. Clock and data are recovered from the digital pulsesoutput from the Slicer. After passing through an enabled or disabledReceive Jitter Attenuator, the recovered data is decoded using B8ZS/AMI/HDB3 line code rule in Single Rail NRZ Format mode and output tothe system, or output to the system without decoding in Dual Rail NRZFormat mode and Dual Rail RZ Format mode. In the transmit path, the data to be transmitted is input on TDn inSingle Rail NRZ Format mode or TDPn/TDNn in Dual Rail NRZ Formatmode and Dual Rail RZ Format mode, and is sampled by a transmitreference clock. The clock can be supplied externally from TCLKn orrecovered from the input transmit data by an internal Clock Recovery. Aselectable JA in Tx path is used to de-jitter gapped clocks. To meet T1/E1/J1 waveform standards, five preset T1 templates and two E1templates, as well as an arbitrary waveform generator are provided. Thedata through the Waveform Shaper, the Line Driver and the Tx Transmitteris output on TTIPn and TRINGn. Alarms (including LOS, AIS) and defects (including BPV, EXZ) aredetected in both receive line side and transmit system side. AIS alarm,PRBS, ARB and IB patterns can be generated /detected in receive /transmit direction for testing purpose. Analog Loopback, Digital Loopbackand Remote Loopback are all integrated for diagnostics. Channel 0 is a special channel. Besides normal operation as theother 21 channels, channel 0 also supports G.772 Monitoring and JitterMeasurement per ITU O.171. A line monitor function per T1.102 is available to provide a Non-IntrusiveMonitoring of channels of other devices. JTAG per IEEE 1149.1 is also supported by the IDT82P2828.

• Integrates 28+1 channels T1/E1/J1 short haul line interfaceunits for 100 O T1, 120 O E1, 110 O J1 twisted pair cable and75 O E1 coaxial cable applications
• Per-channel configurable Line Interface options
• Supports various line interface options
  • Differential and Single Ended line interfaces
  • true Single Ended termination on primary and secondary side of transformerfor E1 75 O coaxial cable applications
  • transformer-less for Differential interfaces
• Fully integrated and software selectable receive and transmit termination
• Supports global configuration and per-channel configuration toT1, E1 or J1 mode
• Per-channel programmable features
• Provides T1/E1/J1 short haul waveform templates and user programmablearbitrary waveform templates
• Provides two JAs (Jitter Attenuator) for each channel of receiverand transmitter
• Supports AMI/B8ZS (for T1/J1) and AMI/HDB3 (for E1) encodingand decoding
• Per-channel System Interface options
• Supports Single Rail, Dual Rail with clock or without clock andsliced system interface
• Integrated Clock Recovery for the transmit interface to recovertransmit clock from system transmit data
• Per-channel system and diagnostic functions
• Provides transmit driver over-current detection and protectionwith optional automatic high impedance of transmit interface
• Detects and generates PRBS (Pseudo Random Bit Sequence),ARB (Arbitrary Pattern) and IB (Inband Loopback) in eitherreceive or transmit direction
• Provides defect and alarm detection in both receive and transmitdirections.
• Programmable LLOS detection /clear levels. Compliant with ITUand ANSI specifications
• Various pattern, defect and alarm reporting options
• Supports Analog Loopback, Digital Loopback and RemoteLoopback
• Channel 0 can be configured as monitoring channel or regularchannel to increase capacity