The XRT75R06D is a six-channel DS3/E3 Line Interface Unit (LIU) with desynchronizer with R3 TechnologyTM. It incorporates an independent receiver for each channel, transmitter and jitter attenuator, and supports E3 (34.368.Mbps), DS3 (44.736Mbps) and STS-1 (51.84 Mbps) modes of operation. The device has a differential receiver, which provides a high noise interference margin capable of receiving data from cables of over 1,000 feet or up to 12dB of cable attenuation. It contains an onboard Pseudo Random Binary Sequence (PRBS) generator and detector with the ability to insert and detect single bit error. This function can be used for diagnostic purposes. The device meets jitter and wander specifications described in the T1.105.03b, and ETSI TBR-24, and is compliant with jitter transfer templates outlined in ITU G.751, G.752 and G.755. It also provides a serial microprocessor interface as well as hardware mode for configuration and control.
R3 TechnologyTM Overview
Exar's R3 TechnologyTM (Reconfigurable, Relayless Redundancy), first introduced in 2002 as a breakthrough capability delivering key benefits to customers designing T1/E1/J1 interface cards has now been extended to the higher speed DS3/E3 environment. Already 3 and 12 channel devices have been announced incorporating this revolutionary technology. The devices are frequency Reconfigurable enabling customers to build one board with a single bill-of-materials. In addition, 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.
- R3 TechnologyTM (Reconfigurable, Relayless, Redundancy)
- On chip Clock and Data Recovery for high-input jitter tolerance
- Meets DS3/E3/STS-1 Jitter Tolerance Requirements
- Detects and Clears LOS as per G.775
- Tri-state Transmit output capability for redundancy applications
- Compliant with Bellcore GR-499, GR-253 and ANSI T1.102 Specification for transmit pulse
- Transmitters can be turned on or off
- On-chip advanced crystal-less Jitter Attenuator for each channel
- 16 02 32 bits selectable FIFO size
- Meets ETSI TBR Jitter Transfer Requirements
- Parallel Microprocessor Interface for control ands configuration
- Each Channel supports Analog, Remote and Digital Loop-backs
- Single 3.3V ± 5% power supply
- Pb-Free, RoHS Compliant Versions Offered
- Digital Access and Cross Connect Systems
- Fiber Optic Terminals
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.