1 Introducing the FSBE/S SBus Card

The Sun Microsystems FSBE/S SBus card provides a 10 Mbytes/sec SCSI-2 interface and a twisted-pair Ethernet channel in a single SBus slot. By combining commonly used functions in a single, low-cost card, the FSBE/S card improves the utilization of SBus slots.

The FSBE/S SBus card is designed for operation in systems that are running Solaris 1.1 Rev. A or later - or other compatible operating systems - and is compatible with the Open Boot PROM version 2.0 or later. An on-board FCode PROM provides configuration support that identifies the FSBE/S SBus card to the system and contains selftest routines.

Note - Solaris Release 1.1 Rev. A or later is required for support of 10 MB/sec SCSI bus transfers.

The SCSI interface has these features:

• 40 MHz clock rate

• SCSI-2 support

• support of 10-byte commands for Group 2

• bus-initiated selection receives these message bytes:

-1 byte of identify and

-3 bytes of queue tag nexus

• SCSI bus asynchronous data transfers:

• up to 6 Mbytes per second

• SCSI bus synchronous data transfers:

• up to 10 Mbytes per second

• single-ended SCSI interface

• maximum cable length of 19.685-feet (6-meters)

• support for up to seven devices

• termination power with fuse protection

The Ethernet interface has these features:

• 128 Kbyte static Ethernet memory

• twisted-pair (10 Base-T) Ethernet support with RJ45 connector

• 10 Mbit per second transfer rate

• byte, halfword, and 8 halfword DMA bursts to Ethernet memory

• provides operations of up to 100 meters of twisted-pair without the use of a repeater

• detection and correction of wrong polarity on the twisted-pair medium

• jumper-selectable Link Integrity Test feature

The Fast SCSI-2/Buffered Ethernet SBus card is available for all Sun-4C and Sun-4M platforms.

1.1 Setting the J0302 Jumper

Before you install the FSBE/S SBus card, you need to set the J0302 jumper. The J0302 is a two-head jumper that uses a two-pin shunt.

When the shunt is connected across the two ends of the jumper, the 10Base-T Link Integrity Test feature is disabled. When the shunt is removed or left on only one end of the jumper, the jumper is open, and the Link Integrity Test feature is enabled.

The Link Integrity Test feature is a requirement of the IEEE 10Base-T standard that allows the receiver to detect a simplex link failure. The feature can be disabled, however, if a customer has 10BaseT devices that do not support this feature.

The board will be shipped with the Link Integrity Test enabled.

Note - On many 10Base-T hubs, such as the AT&T Starlan(TM), the Link Integrity Test feature can be enabled/disabled by a switch. In such cases, the feature should be enabled on both the hub and FSBE/S. If the customer chooses to disable the feature, it should be disabled both at the hub and the FSBE/S.

To set the J0302 jumper:

1. Remove the FSBE/S SBus card from the antistatic bag (refer to Figure 1-1).

Spread the bag on a firm surface and use it as a protective mat.

Figure 1-1 Handling the FSBE/S SBus Card

2. Place the SBus card component side-up, on the bag.

3. Locate the J0302 jumper on the SBus card (refer to ).

4. Configure the jumper (refer to Figure 1-2 ):

a. Use needle-nose pliers and put the shunt over both pins on the jumper to disable the Link Integrity Test feature.

b. Use needle-nose pliers and put the shunt in one pin of the jumper to enable the Link Integrity Test feature.

Figure 1-2 FSBE/S SBus Card Components

* J0302 - Link Disable

** J0202 - OSC Enable

Disabling and Enabling the Link Integrity Test Feature

Note - In the event of "loss of carrier" or "net responding" problems, check the status of the link enable on the FSBE/S SBus card and on the hub.

1.2 Installing the SBus Card

See the documentation that shipped with your system for SBus card hardware installation instructions. As an example, Figure 1-3 shows an installation into Sbus slot 0 (as viewed from the rear). Figure 1-4 is a detail of the Sbus card back panel.

Figure 1-3 600MP System Board with FSBE/S Installed in SBus Slot 0

Figure 1-4 FSBE/S SBus Card Back Panel