Toshiba Strata AirLink Installation Manual page 74

RWIU System Installation
RWIU Additional Information
Ring Back Tones Generator
The RWIU PCB incorporates a 32KB EPROM that generates:
o 440 Hz ring back tone, modulated at 480 Hz
o 2400 Hz busy override tone
o 4 tone channels for the U.S.
Each tone generates 800 bytes every 125 ms. The bytes are sent on a specific time slot of the
matrix and to the related time slot of the PHIN output.
Serial Line Interface
There is a six-pin serial line interface (J7) that debugs and sets up the system. It is a RS-232 port
and connects the PC to the RWIU (see
Table 21 Connector J7 Descriptions
Pin No.
Software Architecture
The RWIU software is a real-time embedded software, written in C language designed for the Intel
80186EC processor. Its modules include real-time tasks, service packages, and hardware drivers.
Its functions are:
o Communication (KSU DHWY and Base Station)
o Local debugging
o Monitor communication
o Call control logic procedures (call origination, delivery and release)
Mobility control (handoff)
o
o Handset text and icon displays
o System and Base Station power up controls
o RWIU cross connects
Base Station software download
o
o Start-up diagnostics (BIT)
o Online diagnostics
o Loop tests
o System audit and parameter refresh
o RWIU and Base Station configuration
o Alarm reports and LEDs
64
Name
1 TXD
2 RTS_0
3 RXD
4 CTS_1
5
6 GND
Table 21).
Description
RS-232 TX data (from the RWIU)
RS-232 RTS data (from the RWIU)
RS-232 RX data (to the RWIU)
RS-232 CTS data (from the RWIU)
Not used
RS-232 Ground (from the RWIU)
Strata AirLink Installation Guide 5/00