user manual

ND-20292
CHAPTER 9
APRIL, 1990
Refer to the modem instruction manual to set up the
A
Pull Cover Back and Up
. different parameters. Some modems use dip switches
; for set up, and some types need a PC with a terminal
emulation program to set these parameters.
Grounding Screw
Front
NOTE: Problems may occur at baud rates higher
than 1200 on standard voice grade telephone
lines. If a transmission rate of 2400 baud is
required, it may be necessary to use data
grade lines to ensure the integrity of the
data being transmitted between modems.
Figure 910-l provides an overview of the relationship
of equipment used with an RAA-E Unit. After a
connection is established, the signal flow at the remote
location is from the computer, to the modem and out
through the CO. At the Electra MarkII location, the
signal comes in from the CO in one of two ways (A):
through the CO&E ETU; from there it is transferred or
diverted via DIT/ANA into the SLI-E( ) ETU. From
the SLI-E( > ETU; the signal goes through the modem
to the RAA-E Unit and to the ESI-E( 1 ETU
programming port of the Electra Mark11 system.
Signal flow from the on site location (to a remote
location) is in the opposite direction.
m 03): the CO
may be connected directly to the modem if so desired.
Figure 920-l Removal of RAA-E Cover
(Rear View of RAA-E Unit)
llolBLlmElllol
DIRECT MODEM RAA 16LK IMS MKll High Low
I/
SECTION 920
RAA-E and MODEM INSTALLATION
920.1 RAA-E Unit SWITCH SETTINGS
The RAA-E Unit has five switches which are used to
set up proper interfacing to the modem or computer,
and between the RAA-E Unit and the Electra Ma&II
system. Switch SW1 is located on the front of the RAA-
E Unit. Switches SW2-SW5 are accessed by removing
the grounding screw located on the rear of the RAA-E
Unit and pulling back and up on the RAA-E cover (See
Figure 920-l).
Reassembly is accomplished by
reversing this procedure.
Switches perform the
following functions:
25
CN2
IIIIIIIIIIIIIIIIII
1 II K-232-C I 1 1
Figure 920-2 RAA-E Unit Switch Locations
(Top View)
NOTE: If the switch settings are changed for any
reason, disconnect and reconnect the
modular line cord. This allows the RAA-E
Unit to read the new settings. (Table 920-l
shows the switch settings.)
other three must be off.
A baud rate setting of 300,
600, 1200, or 2400 can be obtained by turning on
the corresponding dip switch.
2.
3.
SW2 - Direct/Modem Switch is used to tell the
processor in the RAA-E Unit that it is connected
directly to the computer (DIRECT position) or to a
modem (MODEM position).
1. SWl-
Baud Rate Switch is a bank switch
consisting of 4 dip switches accessible from the
front panel next to the POWER LED indicator.
This switch must be set to the same baud rate as
the modem connected to the RAA-E Unit. Only
one dip switch should be set to the ON position, the
SW3 - RAA/lGLK Switch tells the RAA-E Unit
how to configure itself to translate the information
being received from the system and being sent to
the system. This switch should be set to the RAA
position. The 16LK position is reserved for future
use.
900-3