Building on Exar's heritage of delivering market-proven silicon solutions, the Company is capitalizing on its already established functional element devices: Line Interface Unit (LIU), framers, etc., and is combining them into one highly integrated product. The XRT86VL38 and XRT86VL34 greatly reduce board space requirements. They are targeted at telecommunications equipment including SONET/SDH and T1/E1/J1 multiplexers, digital cross-connect systems, wireless base stations, routers among others.
The XRT86VL34 is offered in a four-channel version incorporating a T1/E1 (1.544 Mbit/s or 2.048 Mbt/s) framer and a LIU per channel. Each of the framers has its own framing synchronizer and transmit-receive slip buffers. The slip buffers can be independently enabled or disabled as required. Each framer also contains a transmit and overhead data input port, which permits data line terminal equipment direct access to the out-bound T1/E1/J1 frames. The device has a flexible microprocessor interface for easy configuration, control, and status monitoring. Furthermore, the device supports Channel Associated Signaling (CAS), Common Channel Signaling (CCS), supports ISDN primary Rate Interface (ISDN PRI) signaling and has three integrated HDLC Controllers with two 96-byte transmit HDLC buffers and two 96-byte receive buffers per channel. In addition, the XRT86VL34 includes a PRBS, QRSS and network loop code generator/receiver. It also detects OOF, LOF, LOS errors and COFA conditions.
R³ Technology Overview
Exar's R³ Technology (Reconfigurable, Relayless Redundancy) delivers key benefits to customers designing T1/E1/J1 interface cards. The devices are Reconfigurable with integrated termination supporting all common T1/E1/J1 line impedances enabling customers to build one board with a single bill-of-materials. (Conventional approaches require fixed settings - T1, or E1, or J1, forcing customers to estimate both market needs, and choose device settings before manufacturing.) 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 that can be brought on-line in the event of failure.
- Four-channel Independent, Full Duplex DS1 Tx and Rx Framers and LIUs
- Interfaces with Leading Microprocessors: Intel, Motorola, MIPS, Power PC
- Three Integrated HDLC Controllers with Two 96-byte Transmit HDLC Buffers and Two 96-byte Receive Buffers per Channel
- Pb-Free, RoHS Compliant Versions Offered
- TAN-053, Line Card Redundancy Design With the XRT83SL38 T1/E1 SH/LH LIU ICs
- TAN-056, High Impedance Drivers During Power Failure Using XRT83SL3X/L3X LIU
- TAN-067, R3 Technology For T/E Carrier Redundancy Applications
- TAN-058, DS-1/E1 GR-1089 Surge Protection
- TAN-057, DS1/E1 Layout Recommendations
- TAN-059, DS-1/E1 Line Recovered Clock PLL Timing
- TAN-063, XRT86VL3x HMVIP High Speed Multiplexed Mode
- TAN-060, Converting From XRT86L3x to XRT86VL3x
- TAN-062, XRT86VL3x Processing HDLC Messages
- TAN-064, XRT86VL3x Interface Description
- TAN-200, Exar APIs - OS Portability
- TAN-065, XRT86VL3x Physical Interface
- Channel Service Units (CSUs)
- Digital Access Cross-connect Systems (DACs)
- Wireless Base Stations
- Voice Over Packet Gateways
- Framer Relay Switches and Access Devices (FRADS)
Parts & Purchasing
|Part Number||Pkg Code||RoHS||Min Temp||Max Temp||Status||Buy Now||Order Samples|
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
Frequently Asked Questions
In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result. This brings you to the product page. For example:
Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:
Notice the status column and the “Show obsolete parts” link. A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:
Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:
And then Product Change Notifications:
Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:
If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.