Toshiba Strata AirLink Installation Manual page 75

o System parameters
o UTAM activation
The software is built in layers, each implementing a different function. Each layer gets input from
the layer below and provides services to the layer above. The hardware drivers layer uses
interrupts and API calls interface with the layers above.
The operating system is totally independent of the hardware configuration and uses API calls to
interface with the other layers. All other layers use API calls and inter-task communication
messages to interface each other.
The operating system main services are:
o Task definition and initiation, termination, and context switching
o Inter-task communication (message, semaphores)
o Message handling (mailbox)
Timers
o
o Memory management (buffer pools)
All access to the operating system is performed using an Operating System Shell (OSS). The shell
provides a general API to the operating system services. The software supports the following
interrupt-driven protocols:
o KSU DHWY communication protocol (addressed ASYNC)
o Base Station communication protocol (E1 D channel)
o Local debug/monitor communication protocol (RS-232)
The main data structures are:
o Port information
o Card status
External E1 links state and status
o
o External/internal E1 cross connect configuration
o Base Station configuration
o System ID
UTAM parameter
o
The communication protocol layer, using the corresponding hardware drivers, handles external
interfaces. Messages from the KSU and the Base Station are converted by the communication
protocol layer to inter-task messages and are sent to the corresponding layer or task. The hardware
drivers consist of:
o CPU (Intel 80186EC)
o E1 Transceiver (DALLAS DS2153)
o Matrix (MITEL MT8985)
WDT (CPU)
o
o UART (16550 compatible and internal to the CPU)
o External UART (16550 compatible)
o PIC (8259 compatible and internal to the CPU)
Strata AirLink Installation Guide 5/00
RWIU System Installation
RWIU Additional Information
65