user manual
750.4
LCR PROGRAM CONSTRUCTION
1. BLOCK DIAGRAM,
Figure 700-23 is a block diagram of the Electra
Mark11 with the LCR installed.
Electra Markll
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CPU ;
LCR proper
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Interface -
Section +
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S.XtlOll
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LCR Data
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Programming
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LCR-E ETU
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Figure 700-23 LCR Block Diagram
The LCR-E ETU contains the LCR subsystem
section of the Electra MarkII.
The LCR subsystem selects the least cost route
based on a request from the CPU and informs the
CPU of the same.
The LCR subsystem is composed of the interface
section and LCR proper section.
The interface section executes functions relating to
the Electra MarkII. The LCR proper section
contains the LCR data and executes functions such
as least cost route selection and LCR data entry.
2. PROGRAM CONFIGURATION
LCR data is stored in the LCR proper section by the
programming computer.
This section discusses how the LCR system data is
configured.
The LCR proper section contains the following data
(see Figure 700-24 LCR System Data
Configuration):
Area Code Tables
Three Area Code Tables (l-31 are provided
(although there is a table 0, it cannot be used).
When Tenant Service is used in the Electra Mark11
System, Area Code Tables l-3 are associated with
Tenants l-3 respectively.
Each table contains 160 possible area codes and
contains data that specifies which Weekly Table or
which Route Advance Table is to be referenced
when a given area code is dialed.
Weeklv Tables
Sixty-four Weekly Tables (00-63) are provided.
Each table contains seven items, which correspond
ND-20292
CHAPTER 7
APRIL,
1990
to the days of the week. These tables designate
which Daily Table is to be referenced.
Dailv Tables
Sixty-four Daily Tables (00-631 are provided. Each
tablecontains twenty four items that correspond to
the hours in a day. These tables designate which
Route Advance Table is to be referenced.
Route Advance Tables
Sixty-four Route Advance Tables (00-63) are
provided. Each table can contain 4 entries (l-4)
that correspond to which Route Tables will be
accessed [in priority order (l-411. The LCR
subsystem will attempt to seize routes based on
this order starting with the first. If this route is
unavailable, the second route will be accessed, etc.
If no route is available, or if a lower priority route
is not specified, the user is denied access to the
outside trunks.
Route Tables
Two hundred and ftity six Route Tables (000-2551
are provided. The specified Route Table will
determine which Trunk Access code group will be
selected and what digits are to be dialed to
complete a call routed via LCR.
Each route table contains the following items:
A. Trunk Access Code Group (TRK ACSS CODE)
A maximum of eight Trunk Access Code
Groups are available.
A Trunk Access Code
Group (l-8) must be programmed in each Route
Table for Trunk Group Selection.
B. Area Code Delete (AREA CODE DEL)
The LCR subsystem is Area Code Based.
Therefore, an area code is required to route
calls properly.
Once a Route Table (and a
trunk group) has been selected, depending on
the types of trunk service provided, the area
code may or may not be required to complete
the call.
If, to complete the call on the selected trunk
group, the area code must be deleted, then DEL
should be programmed for Area Code Deletion.
If the area code is required, then NO should be
programmed and the area code will be
included.
NOTE:
LCR Always inserts the HOME NPA (Local
Area Code) when local calls are assigned to
be routed via LCR in System Programming.
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