28(+1) Channel High-Density T1/E1/J1 Line Interface Unit IDT82P2828 Version 3 February 6, 2009 6024 Silver Creek Valley Road, San Jose, California 95138 Telephone: 1-800-345-7015 or 408-284-8200• TWX: 910-338-2070 • FAX: 408-284-2775 Printed in U.S.A. © 2009 Integrated Device Technology, Inc. DISCLAIMER Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best pos- sible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other rights, of Integrated Device Technology, Inc. LIFE SUPPORT POLICY Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is exe- cuted between the manufacturer and an officer of IDT. 1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Table of Contents TABLE OF CONTENTS ........................................................................................................................................................... 3 LIST OF TABLES .................................................................................................................................................................... 7 LIST OF FIGURES ................................................................................................................................................................... 8 FEATURES............................................................................................................................................................................. 10 APPLICATIONS...................................................................................................................................................................... 11 DESCRIPTION........................................................................................................................................................................ 11 BLOCK DIAGRAM ................................................................................................................................................................. 12 1 PIN ASSIGNMENT .......................................................................................................................................................... 13 2 PIN DESCRIPTION ......................................................................................................................................................... 18 3 FUNCTIONAL DESCRIPTION ........................................................................................................................................ 29 3.1 T1 / E1 / J1 MODE SELECTION .............................................................................................................................. 29 3.2 RECEIVE PATH ....................................................................................................................................................... 29 3.2.1 Rx Termination ............................................................................................................................................ 29 3.2.1.1 Receive Differential Mode ........................................................................................................... 29 3.2.1.2 Receive Single Ended Mode ....................................................................................................... 31 3.2.2 Equalizer ..................................................................................................................................................... 32 3.2.2.1 Line Monitor ................................................................................................................................ 32 3.2.2.2 Receive Sensitivity ...................................................................................................................... 32 3.2.3 Slicer ........................................................................................................................................................... 33 3.2.4 Rx Clock & Data Recovery ......................................................................................................................... 33 3.2.5 Decoder ...................................................................................................................................................... 33 3.2.6 Receive System Interface ........................................................................................................................... 33 3.2.7 Receiver Power Down ................................................................................................................................ 34 3.3 TRANSMIT PATH .................................................................................................................................................... 34 3.3.1 Transmit System Interface .......................................................................................................................... 34 3.3.2 Tx Clock Recovery ...................................................................................................................................... 35 3.3.3 Encoder ....................................................................................................................................................... 35 3.3.4 Waveform Shaper ....................................................................................................................................... 35 3.3.4.1 Preset Waveform Template ........................................................................................................ 35 3.3.4.2 User-Programmable Arbitrary Waveform .................................................................................... 37 3.3.5 Line Driver ................................................................................................................................................... 39 3.3.5.1 Transmit Over Current Protection ............................................................................................... 39 3.3.6 Tx Termination ............................................................................................................................................ 39 3.3.6.1 Transmit Differential Mode .......................................................................................................... 39 3.3.6.2 Transmit Single Ended Mode ...................................................................................................... 40 3.3.7 Transmitter Power Down ............................................................................................................................ 41 3.3.8 Output High-Z on TTIP and TRING ............................................................................................................ 41 3.4 JITTER ATTENUATOR (RJA & TJA) ....................................................................................................................... 42 Table of Contents 3 February 6, 2009 IDT82P2828 28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT 3.5 DIAGNOSTIC FACILITIES ....................................................................................................................................... 43 3.5.1 Bipolar Violation (BPV) / Code Violation (CV) Detection and BPV Insertion .............................................. 43 3.5.1.1 Bipolar Violation (BPV) / Code Violation (CV) Detection ............................................................. 43 3.5.1.2 Bipolar Violation (BPV) Insertion ................................................................................................. 43 3.5.2 Excessive Zeroes (EXZ) Detection ............................................................................................................. 43 3.5.3 Loss of Signal (LOS) Detection ................................................................................................................... 44 3.5.3.1 Line LOS (LLOS) ......................................................................................................................... 44 3.5.3.2 System LOS (SLOS) ................................................................................................................... 45 3.5.3.3 Transmit LOS (TLOS) ................................................................................................................. 46 3.5.4 Alarm Indication Signal (AIS) Detection and Generation ............................................................................ 47 3.5.4.1 Alarm Indication Signal (AIS) Detection .....................................................................................