Installation

￿￿￿￿￿￿￿￿

SECTION 1

PRECAUTIONSThe ETUs used in this system make extensive use of CMOS technology that is very susceptible to static electricity. Static discharge must be avoided when handling ETUs. Always use the following precautions:

Wear a grounded wrist strap anytime you handle an ETU.

Make all ETU DIP switch setting changes before inserting the ETU in

￿the KSU.

Carry ETU in a conductive polyethylene bag to prevent static electricity damage.

SECTION 2

ENVIRONMENTAL

CONDITIONSThe following temperature and humidity variances apply for VMS/FMS( )-U10 ETU operation:

Operating temperature: +32º to 85º F (0º ~ 29.5º C)

￿Long-term temperature: +50º to 80º F (10º ~ 26.7º C)

Operating humidity: 10% to 90% (noncondensing)

SECTION 3

INSTALLING THE

DSP-F-21 UNIT ON

THE VMS(4)-U10

ETUTo upgrade a VMS(2)/(4)-U10 ETU to 8 ports, the DSP-F-21 must be installed. When the VMS(8)-U10 ETU is purchased, the DSP-F-21 is installed at the factory. Refer to Figure 2-1DSP-F-21 Unit Installation.

Hardware Specifications

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NEC 750370 manual Section Environmental, Section Installing