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SAS interconnect offers up to 3Gbps data transfer rate

Posted: 28 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:3M? serial attached SCSI? SAS interconnect?

The 3M Electronic Solutions Division offers a line of Serial Attached SCSI (SAS) interconnects to meet the ever increasing requirements for faster data transmission rates in enterprise network storage applications such as storage area networks (SAN), redundant array of inexpensive disks (RAID), direct attach storage (DAS) and network attached storage (NAS).

The RoHS-compliant SAS interconnect line features 29-position combination signal and power connectors and offers a data transfer rate of up to 3Gbps in full duplex mode. Both the plug and receptacle have been defined in the SFF 8482 standard.

In addition, this new connector is an improvement over the existing Ultra 320, which needs an 80-pin connector to support the data rate of 320Mbps in half duplex mode, a speed not able to support the demand of faster data rates for servers (RAID/BLADE) in the enterprise computing market, said the company.

The SAS connectors are designed on a 1.27mm in-line contact pitch and are backward compatible to existing SCSI devices. Because the signal transmission is serialized through two differential pairs, the overall connector size is much smaller compared with previous SCSI connectors, said the company. All connectors feature all matte tin terminals with 30n gold plating.

Recognized in three interface segments, the first segment of the SAS connectors is the primary signal portion in a seven-contact format. Two pairs serve as the transmit (Tx) and receive (Rx) contacts, while three grounds also function as the EMLB contacts to make the device hot pluggable.

The second interface is the 15-contact power segment that accommodates three primary voltage ranges (3.3-, 5- and 12V). Each voltage is allocated three contacts for standard power: positive, negative and ground, which leaves six additional contacts. Five of them are used for GROUND and one for READY LED.

The third segment is the secondary signal port, which provides a redundant path for each drive and is desirable in the event of a controller failover, said the company. Like the primary signal portion, it has seven pins, but the pitch differs: 0.8mm compared with the 1.27mm pitch for the primary signal segment. As it is redundant, two pairs serve as the Tx and Rx contacts, while three grounds also function as the EMLB contacts for hot pluggability. The signal plugs are available in combination with power.

Standard delivery is 28 days after receipt of order.

- Gina Roos

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