Scsi Status, Shortwave, Speed, Target | Siemens PSFR-CP41 specification

Glossary

SCSI Status

A menu used to show the number, and status, of SCSI devices on the bus.

Shortwave

Lasers or LEDs that emit light with wavelengths around 780 nm or 850 nm. Short wave lasers are used for FC links up to ~700 m. They are typically used with multimode fibre. The preferred fibre core size is 50 micron as this fibre has large bandwidth so that the distance is limited by the fibre attenu- ation. A 62.5 micron core size is also supported for compatibility with existing FDDI installations. Fibre of this type has smaller bandwidth and, in this case, the distance is limited by the fibre bandwidth.

SNMP

Simple Network Management Protocol.

Speed

A status type in the FC Status Menu showing the speed (1063 Mbps) of the FC adapter.

Target

A SCSI device (usually the peripheral) that responds to an operation requested by a SCSI initiator (usually the host system). SCSI peripherals are targets, but for some commands (for example, a COPY command), the peripheral may need to act temporarily as an initiator.

Terminator Block/Termination

An electrical connection at each end of the SCSI bus composed of a set of resistors (or possibly other components). Its function is to provide a pull-up for open collector drivers on the bus, and also impedance matching to prevent signal reflections at the ends of the cable.

The SCSI bus requires termination at both ends of the bus. One end of the SCSI bus is terminated by the SCSI adapter’s internal termination. The other end should have a terminator placed on the 68-pin high density SCSI connector on the last SCSI peripheral. If this device is not terminated, data errors may occur.

U42093-J-Z716-1-74

Operating Manual

PSFR-CP41 specifications

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