ADIC FCR 200 Power On Self Test Post, Processor, Reset Scsi, Responder, Router, SCC Addressing

Power On Self Test (POST) Shortwave

Power On Self Test (POST)

A group of tests run when the FCR200 is powered on.

Processor

Contains the arithmetic and logic, control, and internal memory units that control the FCR200.

- R -

Reset SCSI

For a specific SCSI bus, the host clears all inputs and outputs and then resets the bus and all the devices connected to it.

Responder

The logical function in an N_Port responsible for supporting the exchange initiated by the originator in another N_Port. A FC responder is comparable to a SCSI target. The FCR200 is often the responder.

Router

A device which selectively forwards data between storage networks based on administratively defined preferences. The forwarding decision is based on paths between address mappings among dispersed initiators and targets.

- S -

SCC Addressing

Amenu name. SCSI-3 Controller Commands (SCC) addressing is used to address SCSI devices attached to the FCR200 using the SCC logical unit addressing method. In SCC addressing mode, the FCR200 will respond to FCP commands as in a SCC controller device.

SCSI

Small Computer System Interface. An industry standard for connecting peripheral devices and their controllers to an initiator.

SCSI Adapter

A16-bit fast/wide differential or 8-bit narrow single-ended physical connection between the FCR200 and the SCSI devices. Each SCSI adapter supports up to sixteen (for fast/wide) or eight (for narrow) SCSI devices, including itself.

SCSI Addressing

A fast/wide SCSI adapter supports up to 16 devices, including itself. Each device has its own unique SCSI address. The SCSI address of a device dictates the device’s priority when arbitrating for the SCSI bus. SCSI address “7” has the highest priority. The next highest priority address is “6” followed by 5, 4, 3, 2, 1, 0, 15, 14, 13, 12, 11, 10, 9, 8, with “8” being the lowest priority address.

The fast/wide SCSI adapter is factory set to address 7. A narrow SCSI adapter supports up to eight devices, including itself. SCSI address “7” has the highest priority followed by 6, 5, 4, 3, 2, 1, and 0.

SCSI Bus

The means of transferring SCSI data between SCSI devices. It is an 8-bit or 16-bit bus that supports up to eight or sixteen devices (including itself), in any mix of initiators and targets, with the limitation that at least one initiator and one target must be present.

SCSI Device

A single unit on the SCSI bus, identifiable by a unique SCSI address. A SCSI device can act as an initiator or target. For SCSI-3, each SCSI device supports up to sixteen LUNs.

SCSI Port

An opening at the back of the FCR200 providing connection between the SCSI adapter and the SCSI bus.

SCSI Status

A menu name used to show the number of SCSI devices on the bus.

Shortwave

Lasers or LEDs that emit light with wavelengths around 780 nm or 850 nm. When using multimode fibre (50 nm), shortwave lasers can be used with FC links less than 500m. To achieve longer lengths, single-mode fibre is required. The preferred fibre core size is 50 micron as this fibre has large bandwidth so that the distance is limited by the fibre attenuation. 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.

Glossary gl-5