Справочник Пользователя для Seagate ST43400N/ND

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Figure 13 shows how the terminator resistor-paks are attached on drives with
differential I/O. These terminator resistor-paks, which are dual inline packages,
mount in sockets in the control board. These terminators are also marked with a
dot above pin 1.
If the drive is located at either end of the daisychain, ensure that it has
resistor-pak(s) installed. Section 4 lists resistor-pak part numbers. Refer to
information earlier in this section regarding the terminator power source
jumper.
Grounding the system
Grounding the system through the power cables and I/O cables is usually
sufficient to protect against noise and emissions.
Terminator
Resistor-Paks
(dual inline
packages)
Terminator Power
Source Jumper
Terminator
Resistor-Pak
(note orientation)
Terminator
Socket
Pin 1
Figure 13. Terminator attachment—differential I/O