Document
www.DataSheet4U.com
MARCH 2007
XRT83VSH38
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
GENERAL DESCRIPTION
The XRT83VSH38 is a fully integrated 8-channel short-haul line interface unit (LIU) that operates from a 1.8V and a 3.3V power supply. Using internal termination, the LIU provides one bill of materials to operate in T1, E1, or J1 mode with minimum external components. The LIU features are programmed through a standard parallel or serial 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.
The on-chip clock synthesizer generates T1/E1/J1 clock rates from a selectable external clock frequency and outputs a clock reference of the line rate chosen. Additional features include RLOS, a 16-bit LCV counter for each channel, AIS, QRSS generation/ detection, TAOS, DMO, and diagnostic loopback modes. 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
FIGURE 1. BLOCK DIAGRAM OF THE XRT83VSH38 T1/E1/J1 LIU (HOST MODE)
MCLKE1 MCLKT1
MASTER CLOCK SYNTHESIZER
MCLKOUT
1 of 8 channels, CHANNEL_n TPOS_n/TDATA_n TNEG_n/CODES_n TCLK_n
QRSS PATTERN GENERATOR HDB3/ B8ZS ENCODER TX/RX JITTER ATTENUATOR
TAOS TX FILTER & PULSE SHAPER
DRIVE MONITOR LINE DRIVER
DMO_n TTIP_n TRING_n TXON_n
TIMING CONTROL
Remote Loopback
Digital Loopback
Analog Loopback
QRSS DETECTOR
RCLK_n RNEG_n/LCV_n RPOS_n/RDATA_n
HDB3/ B8ZS DECODER
TX/RX JITTER ATTENUATOR
TIMING & DATA RECOVERY AIS DETECTOR
PEAK DETECTOR & SLICER
RTIP_n RRING_n
LOS DETECTOR
RLOS_n
HW/HOST WR_R/W RD_DS ALE-AS CS RDY_DTACK/SDO INT SER_PAR
TEST
MICROPROCESSOR/SERIAL INTERFACE CONTROLLER
ICT µPTS1 µPTS2 D[7:0]
µPCLK/SCLK
A[7:0]/SDI RESET
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
XRT83VSH38
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT FIGURE 2. BLOCK DIAGRAM OF THE XRT83VSH38 T1/E1/J1 LIU (HARDWARE MODE)
MCLKE1 MCLKT1 CLKSEL[2:0]
REV. 1.0.7
MASTER CLOCK SYNTHESIZER
MCLKOUT TAOS_n
TAOS TX FILTER & PULSE SHAPER DRIVE MONITOR LINE DRIVER
1 of 8 channels, CHANNEL_n TPOS_n/TDATA_n TNEG_n/CODES_n TCLK_n
QRSS PATTERN GENERATOR HDB3/ B8ZS ENCODER TX/RX JITTER ATTENUATOR
DMO_n TTIP_n TRING_n TXON_n
TIMING CONTROL
Remote Loopback
Digital Loopback
Analog Loopback
QRSS DETECTOR
RCLK_n RNEG_n/LCV_n RPOS_n/RDATA_n
HDB3/ B8ZS DECODER
TX/RX JITTER ATTENUATOR
TIMING & DATA RECOVERY AIS DETECTOR
PEAK DETECTOR & SLICER
RTIP_n RRING_n
LOOP1_n LOOP0_n
LOS DETECTOR
RLOS_n
HW/HOST GAUGE JASEL1 JASEL0 RXTSEL TXTSEL TERSELR XRES0 RXRES1
TEST
ICT
RESET TRATIO SR/DR EQC[4:0] TCLKE RCLKE RXMUTE ATAOS
HARWARE CONTROL
2
XRT83VSH38
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
FEATURES
• Fully integrated eight channel short-haul transceivers for T1/J1 (1.544MHz) and E1 (2.048MHz) applications • T1/E1/J1 short haul and clock rate are per port selectable through software without changing components • Internal Impedance matching on both receive and transmit for 75Ω (E1), 100Ω (T1), 110Ω (J1), and 120Ω
(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 per channel • User programable Arbitrary Pulse mode • On-Chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel
basis
• Selectable Crystal-Less digital jitter attenuators (JA) with 32-Bit or 64-Bit FIFO for the receive or transmit
path
• 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 • Receive monitor mode handles 0 to 6dB resistive attenuation (flat loss) along with 0 to 6dB cable loss for
both T1 and E1
• Loss of signal (RLOS) according to ITU-T G.775/ETS300233 (E1) and ANSI T1.403 (T1/J1) • 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/PRBS pattern generator and detection for testing and monitoring • Error and bipolar violation insertion and detection • Transmit all ones (TAOS) Generators and Detectors • Supports local analog, remote, digital, and dual loopback modes •.