NEC nd-20292 manual PC8300 and PC-8231A Installation

ND-20292

CHAPTER 9

APRIL, 1990

Attendant intervention with a system supported by a CPU-EBB (or higher) ETU.

To prevent an accidental disconnection, it is recommended to assign the following system data.

NOTE: In this application, the modem connected to the RAA-E Unit must have auto answer capability.

MEMORY BLOCK 3B-4 RAA SLT ASSIGNMENT (CPU-EB3 ETU required)

This Memory Block is used to avoid accidental disconnections between the RA&E unit and the associated programming ETUs (ESI, SLI, VMI, CO1 or TLI) when remote or local programming/ maintenance is being performed. See Figure 910-l.

This program inhibits disruption of the RAA-E Unit programming connection when any of the following changes are attempted for slots, ports or ETUs Involved:

	Table 920
MEMORY	FUNCTION
BLOCK
3D3	Forced Slot	SLI-I ( ),ESI- ( 1,
	Initialization	VMI, COI-( ),
3D4	Forced Terminal RAA-E Unit
	Initialization
4A2	System All Busy	SLI-I( ), VMI,
	Out Assignment	COI-( ), TLI-( ), ESI-
		0
4C2	Interface Slot	%.,I-( 1,VMI,
	Busy Out	COI-( ),TLI-( ),
	Assignment	ESI-( 1
lE3	Terminal Busy	R&&E Unit, SLI ( 1,
	Out Assignment	VMI Extensions
lE3	Port Busy Out	RAA-E Unit, SLI ( ),
	Assignment	VMI, CO1 (TLI)

The following program changes will disconnect the RAA-E connection when applied to the the equipment involved.

The following steps should be considered when connecting the modem to a line.

1.Ensure that all switches are properly set in the modem. Take special care that the baud rate

			Table 920-4
	MEMORY		FUNCTION
	BLOCK
I	4Cl	1Card Interface Slot Assignment		1
I	lE2	I	Terminal Add Port	I

setting of the modem matches that of the RAA-E Unit, and that the modem is set for auto answer.

2.If a dedicated Central Office (CO) line is being used, connect the CO line to the modem as described in the instruction manual provided by the modem manufacturer. If a single line port position is used, connect the modem to the single line port as if it were an SLT, following the instructions provided by the modem manufacturer. If a line is not already available, it may be necessary to run a cable and connect a modular jack to a single line port of the system’s MDF.

920.6GROUNDING the RAA-E and MODEM The RM-E Unit and the modem connected to it, must be grounded to the same earth ground point. In order to effectively ground the RAA-E Unit, a spade lug connected to an 18 AWG grounded wire should be fastened underneath the screw on the back (RS-232C side) of the RAA-E Unit. (See Figure 920-l.)

920.7MODEM to MODEM CONNECTION

Dependingupon the type of modems and computers used, the procedures used to make the end to end modem connections will vary. Refer to the modem’s and computer’s instruction manual to determine the proper procedure for end to end connection. Things to take into account are manual or auto-dial capabilities and manual or auto-answer capabilities. It should also be noted that the ADMI.DO File is a stand alone Host program and does not contain a Communications Application program, therefore, Request To Send CRTS)and Data Terminal Ready (DTR) will not be ON at the PC Communications Port (COM PORT) when the file is executed.

SECTION 930

PC8300 and PC-8231A INSTALLATION

Refer to Chapter 7, Sections 740 and 750.5.

900-6