RWIU System Installation
RWIU Additional Information
Strata AirLink Installation Guide 5/00
59
The WWIS PCB (see
Figure 29
) has the following components:
♦
Four E1 transceivers with crystals, line transformers, protectors, and electronic circuit
breakers
♦
Two LEDS for each transceiver
♦
Eight elastic buffers, two for each E1 interface
♦
Surface Mount Technology (SMT) resistors and capacitors
Figure 29
Top and Side View of WWIS
The thickness of the RWIU is 1.6 mm and the maximum distance between the WWIS PCB
(including the height of the mounted components) is 30 mm.
Signaling
A high density Mach decoder generates all the chip select signals and control signals for Erasable
Programmable Read Only Memory (EPROM), flash and RAM memories, peripherals, and Input/
Output (I/O) devices. The Mach device includes a serial interface on connector J7 for on-board
programming.
The digital I/O block has two digital input buffers and four output D flip-flops for the digital
output signals. All input buffers and output flip-flops connect to the CPU lower data bus using a
bidirectional transceiver. All control signals are generated to the I/O devices by the Mach decoder.
A power ON external reset generator is provided by an internal WDT chip. There is also a power-
fail circuit that alerts the CPU when the voltage falls below 4.75V. This feature is necessary
because the CPU stores data in the backup memory of the RTC during a power failure.
An RTC chip mounts on the RWIU PCB only. It has an internal Lithium battery and an internal
backup 2KB of SRAM memory, powered by the same Lithium battery.
The RWIU interfaces to the Strata DK system using a 32 time slot, 2.048 MHz Pulse Code
Modulator (PCM) channel. The PCM channel has the following signals:
♦
PHOUT – 32 time slots (receiving data)
♦
PHIN – 32 time slots (transmitting data)
♦
PHFS – 8 KHz frame synchronization output
3722
J4
LED4
LED3
LED2
LED1
J3
J2
J1
P16
P17
P14
P15
P13
P12
P9
P10
WWIS1A
TOSHIBA
WWIS (top view)
J4
LED4
LED3
LED2
LED`
J3
J2
J1
WWIS (side view)
Summary of Contents for Strata AirLink
Page 6: ...Contents Chapter 5 Maintenance and Troubleshooting iv Strata AirLink Installation Guide 5 00 ...
Page 10: ...Introduction Related Documents Media viii Strata AirLink Installation Guide 5 00 ...
Page 28: ...Pre installation Step 10 Mount Base Stations 18 Strata AirLink Installation Guide 5 00 ...
Page 106: ...Maintenance and Troubleshooting Troubleshooting 96 Strata AirLink Installation Guide 5 00 ...