HP SW TL881 DLT Mini-Lib/1 Compaq TL881 MiniLibrary System Users Guide (May 19 - Page 97

Interface Cable Specifications, IMPORTANT, MiniLibrary Base Module, Fast/Wide DLT 20/40 Drive

Get HP SW TL881 DLT Mini-Lib/1 PDF manuals and user guides View all HP SW TL881 DLT Mini-Lib/1 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 97 highlights

3-28 Compaq TL881 Minilibrary System Users Guide In order to connect a module to a host computer system, the host system must have at least one SCSI controller and the appropriate driver software. As noted earlier, higher-speed drives may require the use of separate SCSI controllers for each drive or each pair of drives. No more than two TZ89 drives should be connected to a single SCSI bus. Your Technical Support representative is available to answer your questions about installation procedures for specific host systems. Before cabling the system, see the recommended SCSI cable specifications in the following section. Also, see the section entitled Interface Cable and Terminator Installation. Interface Cable Specifications The MiniLibrary is a high-performance system. To avoid degradation of performance, use the highest-quality interface cables. The detailed requirements for SCSI cables are set forth in ANSI X3.131-1994. All SCSI cables used with the MiniLibrary Module meet at least the following requirements: s Shielded or double-shielded, as required to meet EMI specifications; s Impedance match with cable terminators of 132 ohms, ideally; s Characteristic impedance between 90 and 132 ohms, required; s Each end of the twisted pair ground must be connected to chassis ground; s The maximum cable length for a differential Fast SCSI bus is 82 ft. (25 m) IMPORTANT: When calculating the overall length of the bus, be sure to include the internal cabling of the module, which is as follows: MiniLibrary Base Module: Fast/Wide (DLT 20/40 Drive) DLT0 14 inches (36 cm) DLT1 23 inches (57 cm) Expansion Unit: 32 inches (81 cm) s Cables of different impedances should not be used together. Additional specifications to assure the highest SCSI performance can be found in ANSI X3.131-1994 or later.

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
3-28
Compaq TL881 Minilibrary System Users Guide
In order to connect a module to a host computer system, the host system must
have at least one SCSI controller and the appropriate driver software. As noted
earlier, higher-speed drives may require the use of separate SCSI controllers
for each drive or each pair of drives. No more than two TZ89 drives should be
connected to a single SCSI bus. Your Technical Support representative is
available to answer your questions about installation procedures for specific
host systems. Before cabling the system, see the recommended SCSI cable
specifications in the following section. Also, see the section entitled
Interface
Cable and Terminator Installation
.
Interface Cable Specifications
The MiniLibrary is a high-performance system. To avoid degradation of
performance, use the highest-quality interface cables. The detailed
requirements for SCSI cables are set forth in ANSI X3.131-1994. All SCSI
cables used with the MiniLibrary Module meet at least the following
requirements:
■
Shielded or double-shielded, as required to meet EMI specifications;
■
Impedance match with cable terminators of 132 ohms, ideally;
■
Characteristic impedance between 90 and 132 ohms, required;
■
Each end of the twisted pair ground must be connected to chassis
ground;
■
The maximum cable length for a differential Fast SCSI bus is
82 ft. (25 m)
IMPORTANT:
When calculating the overall length of the bus, be sure to include the
internal cabling of the module, which is as follows:
MiniLibrary Base Module:
Fast/Wide (DLT 20/40 Drive)
DLT0
14 inches (36 cm)
DLT1
23 inches (57 cm)
Expansion Unit:
32 inches (81 cm)
■
Cables of different impedances should not be used together.
Additional specifications to assure the highest SCSI performance can be found
in ANSI X3.131-1994 or later.