NEC nd-20292 manual Section Equipment Identification

ND-20292

CHAPTER 7

APRIL, 1990

ON	_..	DIPI Baud	.r	Rate Switch	o
. . . ... . . . . . . . . . . . . . . . . . . .		.......... ...			_
OFF					T-
		96 x 100
		43
		24
		12
LPI		6
0		3
		1.5

Figure 700-l LCR-E ETU Switch/LED Layout

SECTION 720

EQUIPMENT IDENTIFICATION

720.1GENERAL

The LCR-E ETU is an option in the system. Equipment such as the portable computer, PC-8300 or APC IV, IBM PC XT or AT, Datavue’s Spark Laptop, Epson’s Equity LT Laptop, or IBM PS/2 Model 30, which is required for programming, must be locally provided.

720.2LCR-E ETU

The LCR-E ETU is the Least Cost Routing Unit that consists of an 8 bit microprocessor, a 256K ROM chip, a 256K RAM chip, clock generator circuit, RS-232C interface and common memory circuit.

The LCR-E contains three switches, an LED and an RS232C connector ended ribbon cable (see Figure 700- 1 LCR-E ETU Switch/LED Layout).

Switch 1, designated SWl, is used to turn on a backup battery for the LCR-E memory. This switch should be set to the ON position to allow memory retention during power failure or brownout conditions.

Switch 2, designated SW2 is used to busy inlout the LCR-E ETU allowing the ETU to be removed or inserted without powering down the system.

The DIP1 switch is a seven position dip switch used to select a baud rate in the range of 150-9600. This

switch should normally be set to 4800 baud. See Figure 700-l LCR - E ETU Switch/LED Layout.

LPl LED (green) lights in conjunction with SW2 being in the ON position, indicating that the LCR-E ETU is receiving power,

A 25 pin RS-232C connector ended ribbon cable is provided to connect to the programming computer, which is used to enter data into the LCR-E ETU memory.

A maximum of one LCR-E ETU can be installed in a system, into either OPl, OP2, or OP3 slots of any CCU.

720.3PROGRAMMING COMPUTER

1.General

The Electra Mark11Digital Telephone System uses the PC-8300 or NEC’s APC IV etc. to program the LCR-E ETU.

2.Specifications

For PC-8300 specifications, refer to the operations manual provided with the PC-8300.

3.Equipment Required

The following equipment is required to install, program, and maintain the LCR-E ETU.

A.APC IV or equivalent computer with a built in 3.5” or 5.25” drive OR

700-2