user manual

ND-20292
CHAPTER 7
APRIL, 1990
LPI
0
ON
_.
OFF
DIPI Baud Rate Switch o
. . . . . . . . . . . . . . . . . . . . . . . . . . _ . . . . . . . . . . . . . . . . r
T-
_
96 x 100
43
24
12
6
3
1.5
Figure 700-l LCR-E ETU Switch/LED Layout
SECTION 720
EQUIPMENT IDENTIFICATION
720.1 GENERAL
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.
720.2 LCR-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.
720.3 PROGRAMMING COMPUTER
1.
2.
3.
General
The Electra Mark11 Digital Telephone System uses
the PC-8300 or NEC’s APC IV etc. to program the
LCR-E ETU.
Specifications
For PC-8300 specifications, refer to the operations
manual provided with the PC-8300.
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