Memory Modules; Cabling; Scsi; Fiber Optic - Sun Microsystems Enterprise 3500 System Reference Manual

D.9

Memory Modules

1. The DIMMs are 168-pin, JEDEC-standard devices. Do not use other types of
memory modules.
2. Requirement — Do not mix 8, 32, or 128 Mbyte DIMMs in the same bank. (All
DIMMs in a bank — eight DIMMs — must have the same capacity.)
3. Note that two banks of DIMM slots on a CPU/Memory+ board are interleaved. A
bank is composed of eight alternating DIMM slots.
4. All DIMMs in a bank should have the same speed rating. If DIMMs of different
speeds are mixed in a bank, the bank will function, but at the lowest speed.
D.10

Cabling

D.10.1

SCSI

1. Requirement — Do not attach any external SCSI devices to the onboard SCSI
connector of the I/O+ board in card cage slot 1.
2. To add external SCSI devices, use the SBus slots on the I/O+ board, or add a
second I/O+ board. You may use either an SBus+ I/O board or a Graphics+ I/O
board.
3. Maximum — The maximum length for a chain of single-ended (non-differential)
SCSI cables is 6.0 meters (20 feet).
4. Maximum — The maximum length for a chain of differential SCSI cables is 25
meters (82 feet).
D.10.2

Fiber Optic

The minimum bend radius for fiber optic cable is 1.0 inch. The IB has FC-AL
circuitry to support up to eight internal fiber optic disk drives. Two GBICs (in slots
LA and UA) on the IB connect through cables to GBICs on the I/O+ board; use a 2-
meter cable. The remaining GBIC slots (LB and UB) on the IB can be used for
D-6 Sun Enterprise 3500 System Reference Manual • August 2001