6 x 4 ELECTRONIC SCSI SWITCH
3.5 SCSI Interface Cabling
Both versions of the 6 x 4 Electronic SCSI Switch are supplied with 68-pin shielded high-density SCSI-2 connectors. Single-ended devices can have cable lengths up to 20 ft. (6 m). Differential or low-voltage differential (LVD) devices can be connected with up to 82 ft. (25 m) of cable.
Connect the host adapter or peripheral to the rear-panel connector using the proper SCSI cable. Section 6.1 describes standard SCSI-cable interface requirements. When you connect devices to ports A through D, use one of the port connectors, not both.
NOTE
Do not intermix single-ended/LVD and differential devices on any SCSI chain unless a SCSI differential converter is used to convert from one bus type to the other.
Figure 3-1. The SCSI Switch’s rear panel.
3.6 RS-232 Serial Port Cabling
The SCSI Switches have a DB9 female RS-232 serial port on their rear panel, pinned so that you can use a straight-through-pinned DB9 male-to-female serial cable (such as the one provided with the SCSI Switch) to connect it to the DB9 male serial ports on a PC. Pins 1, 2, 3, 5, and 6 (CD, TD, RD, SGND, and DSR respectively) are functional on the SCSI Switch’s RS-232 port; Pins 4 and 8 (DTR and CTS) are tied together; and Pins 7 and 9 (RTS and RI) have no function.
3.7 Ethernet LAN Port Cabling
The SCSI Switches have a RJ-45 female 10BASE-T Ethernet port on their rear panel. Use a standard straight-through-pinned twisted-pair cable (CAT5 or higher) to connect this port to an Ethernet hub, switch, or router. To connect this port directly to a 10BASE-T port on a computer, you’ll need to use a cross-pinned cable.
