Hitachi AMS 2100, Hardware Manual

Page: 154 / 306

5–36
Installation
Hitachi AMS 2100/2300 Storage System Hardware Guide
Connecting ENC cables (expansion unit)
This section covers the expansion unit. See the next section for information
to connect cables to a high-density expansion unit.
Use the ENC cables supplied with the expansion unit to connect an ENC unit
in an expansion unit to the base unit controller(s) and/or to other expansion
units or high-density expansion units. Two ENC cables are supplied with
each expansion unit.
As shown in Figure 5-33 , the connector that plugs into the control unit on a
base unit is stamped with a diamond. This connector can also plug into an
OUT connector on an ENC unit. The connector that plugs into the IN
connector on an ENC unit is stamped with a circle.
Figure 5-33: ENC Connectors
• When two or more expansion units are connected, both cables in ENC
unit #0 and ENC unit #1 should be connected to the expansion unit.
• If it is necessary to bend an ENC cable to connect it, keep the bend
radius as large as practical, and not less than 30 mm. This prevents
excessive stress on the cable and the connector.
CAUTION! The connectors on the ends of an ENC cable are
different. Check the label on the connector before plugging it in.
ENC connectors are designed to slide easily into the connector on
the ENC unit. If a connector does not plug in easily, check the
connector to make sure you have the correct end of the cable.
CAUTION! Additional chassis must be connected in order of Path
number and unit ID number. For details, refer to Chapter 11,
Connection configuration restrictions .
Table 5-8: ENC Connectors
Item Description Item Description Item Description

Lock Tab (pull tab
to unlock connector
before unplugging
it)

Diamond stamp
on controller and
ENC OUT end of
cable

Circle stamp on
ENC IN end of
cable.