Adaptec 3940UW User's Guide Page 25
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Installing the Host Adapter and SCSI Devices
AHA-3940U/3940UW/3940UWD User’s Guide
Stock Number: 511041-00, Rev. B Page: 2-5
Print Spec Number: 494569-00
Current Date: 2/14/97 ECN Date: 2/17/97
Connecting SCSI Cables and Devices
Choosing SCSI Cables
Always use high-quality SCSI cables to connect the host adapter to
devices on the SCSI bus. Poor-quality cables can cause data corrup-
tion, parity errors, and other problems. High-quality cabling is espe-
cially critical if you use UltraSCSI or Fast SCSI data transfer rates.
The round cables used for external SCSI devices vary widely in
quality and electrical characteristics. Be sure external SCSI cables
meet SCSI-2 standards (ask your cable vendor). For UltraSCSI appli-
cations, SCSI cables must meet Fast-20 SCSI standards. Here are
some guidelines for external SCSI cables:
■
SCSI-2: Use cables with a single-ended impedance range of 90
to 132 ohms.
■
UltraSCSI: Use cables with a single-ended impedance range of
90 ± 10 ohms. For the
REQ
and
ACK
signals the impedance
should be 90 ± 6 ohms.
■
Do not use cables shorter than 30 cm (11.8 inches) between any
two SCSI devices.
Adaptec sells high-quality internal and external UltraSCSI and
SCSI-2 cables. If your reseller does not stock these cables, call
Adaptec directly at the number listed on page ii.
Maximum Cable Lengths
To assure reliable operation, the total length of the SCSI bus, includ-
ing both internal and external cabling, should not exceed 6 meters
(19.7 feet) for synchronous or asynchronous data transfer rates, and
3 meters (9.8 feet) for UltraSCSI data transfer rates.
Caution:
AHA-3940U/3940UW/3940UWD host adapters
support only single-ended SCSI devices. Do not connect
differential SCSI devices, or the host adapter may be dam-
aged. Read your device documentation to find out whether
the device is single-ended or differential.
- AHA-3940U/3940UW/3940UWD 1
- AHA-3940U/3940UW/ 3
- GO ADAPTEC 4
- Contents 7
- 4 Operating System Support 8
- 5 Troubleshooting 9
- B Optimizing Performance 9
- C Disk Drives Over 1 GByte 9
- Print Spec Number: 494569-00 10
- Introduction 13
- Product Features 14
- PCI Bus Interface 15
- PCI-to-PCI Bridges 15
- Data Transfer Rates 15
- Disk Array Support 16
- Multiple Device Support 17
- Helvetica Italics 18
- Advisories 19
- Installing the Host Adapter 21
- Host Adapter Layout 22
- WARNING: 23
- Caution: 23
- Choosing SCSI Cables 25
- Maximum Cable Lengths 25
- Plug this end into the 26
- Plug this end into an 26
- 8-bit internal device 26
- Internal SCSI 28
- Colored Stripe 28
- External SCSI Cable 29
- External SCSI Connector 29
- (AHA-3940UWD has two 29
- External 30
- SCSI Cable 30
- External SCSI Device 30
- SCSI Cables 30
- Terminating the SCSI Bus 31
- Terminating the Host Adapter 32
- Host Adapter 33
- Termination 33
- Disabled 33
- Automatically 33
- SCSI IDs 34
- Setting SCSI IDs 35
- LED Connector J4 36
- LED Cable 36
- Configuring Your Host 39
- When to Use SCSI 41
- Starting SCSI 41
- Selecting a SCSI Channel 42
- Using the Options Menu 43
- =default) 44
- Host Adapter SCSI ID 45
- SCSI Parity Checking 46
- Host Adapter SCSI Termination 47
- Boot Device Options 48
- SCSI Device Configuration 49
- Saving Configuration Changes 55
- Format Disk 56
- Verify Disk Media 57
- Verify Disk 57
- Operating System Support 59
- Adaptec 7800 Family Manager 60
- Troubleshooting 61
- BIOS Startup Messages 62
- Other Problems and Solutions 66
- Multiple Computer 69
- Configuration 69
- Optimizing Performance 71
- Enabling Wide Negotiation 72
- Disabling the Channel BIOS 72
- Enabling SCSI Parity Checking 72
- Setting Enable Disconnection 72
- Disk Drives Over 1 GByte 75
- Than 1 Gbyte 76
- ▼ ▼ ▼ ▼ 77
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