XRT83SL314

The 14-channel XRT83SL314 and XRT83L314 LIUs are targeted at solving the data stream conversion challenge between T1/E1 and DS3/E3. In a METRO environment, a conventional multiplexer must multiplex/demultiplex 28 T1, or 21 E1 channels into a single DS3/E3 signal. Using combinations of eight-channel or four-channel devices can accommodate the 28-channel requirement, but at the expense of not fully utilizing all channels (32 channels in a 4x 8-channel configuration), or wasting precious board space. Exar's 14-channel devices give OEMs maximum design flexibility, and with the addition of R3 Technology clearly distinguish the parts in the marketplace. The devices are targeted at Multi-Service Provisioning Platforms (MSPPs), media gateways, routers, and frame relay access devices.

R³ Technology^TM

Exar's R³ Technology^TM (Reconfigurable, Relayless, Redundancy) delivers key innovative features to customers designing T1/E1/J1 interface cards. The devices are Reconfigurable with integrated terminations supporting all common T1/E1/J1 line impedance's (75/100/110/120 ohms) enabling customers to build one board with a single bill-of-materials. Also, the series employs Relayless Redundancy eliminating the need for external relays for 1:1 and 1+1 applications by establishing a back-up channel or card that can be brought on-line in the event of failure.

Product Details

The 14-channel XRT83SL314 (Short Haul) and XRT83L314 (Short Haul/Long Haul) contain two crystal-less jitter attenuators per channel that can be simultaneously configured in both the transmit and receive paths. The devices meet or exceed popular telecom specifications such as ITU G.703, G.775, ANSI T1.402. and Bellcore GR-499 core. Also, because of their inherent flexibility and standards compliance, the LIUs can be used in conjunction with any of Exar's T1/E1/J1 framers, or with a customer's specific device. Other features include a parallel microprocessor bus supporting both synchronous and asynchronous microprocessor interfaces for Motorola, Intel and MIPS processors. In addition, they include an on-chip frequency multiplier that can generate a T1 or E1 master clock signal from a variety of external sources. Also for T1/E1/J1 short haul environments clock rates are selectable through software, and there is no need to alter or change components.

The devices have on-chip transmit short-circuit protection and limiting which protects line drivers from damage on a per channel basis. This coupled with a QRSS pattern generator for detection and testing, enables customers to be alerted when data transmission problems occur. Both devices are in 304-lead TBGA packages and have 250mW per channel maximum power dissipation in a 3.3V power supply operation.

• Fully integrated 14-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
  
• Arbitrary Pulse Generators for both T1 and E1 modes
  
• On-Chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel basis
  
• Independent Crystal-Less digital jitter attenuators (JA) with 32-Bit or 64-Bit FIFO for the receive and transmit paths
  
• On-Chip frequency multiplier generates T1 or E1 master clocks from a variety of external clock sources (8, 16, 56, 64, 128, 256kHz and 1X, 2X, 4X, 8X T1 or E1)
  
• 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 29dB resistive attenuation (flat loss) along with 0 to 6dB cable loss for both T1 and E1
  
• Receiver line attenuation indication output in 1dB steps
  
• Loss of signal (RLOS) according to ITU-T G.775/ETS300233 (E1) and ANSI T1.403 (T1/J1)
  
• Programmable receive slicer threshold (45%, 50%,55%, or 68%) for improved receiver interference immunity
  
• 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 pattern generator and detection for testing and monitoring
  
• Error and bipolar violation insertion and detection
  
• Transmit all ones (TAOS) and in-band network loop up and loop down code generation
  
• Automatic loop code detection for remote loopback activation
  
• Supports local analog, remote, digital, and dual loopback modes
  
• Low Power dissipation: 170mW per channel (50% density)
  
• 250mW per channel maximum power dissipation (100% density)
  
• Single 3.3V supply operation (3V to 5V I/O tolerant)
  
• 304-Pin TBGA package
  
• -40°C to +85°C Temperature Range
  
• Supports gapped clocks for mapper/multiplexer applications
  
• Pb-Free, RoHS Compliant Versions Offered

• 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
  
• Integrated Multi-Service Access Platforms (IMAPs)
  
• Integrated Access Devices (IADs)
  
• Inverse Multiplexing for ATM (IMA)
  
• Wireless Base Stations