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Technology Stocks : White light from LED
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To: John Finley who wrote (399)2/18/2001 6:02:42 PM
From: Link Lady  Read Replies (1) of 565
 
I can't answer your question but at the conference call I listened to, the CEO said Laser would not be used in urban areas due to eye safety issue. This was my understanding.
The following was taken from one of their PDF sales files I have in my email. Maybe you can find the answer here.
I am not technologically smart. Sorry
Cellular network operators face increased pressure to roll
out Base Station Controllers (BSCs) to improve network
quality and add capacity, commonly in dense urban areas
where existing backhaul may be saturated.
Micro cellular technology is widely utilised to extend
network coverage but is restricted due to the lack of
available connectivity to the BSCs.
The WaveBridge™ 700 series also provides multiple E1/T1
solutions between sites allowing up to 16 x E1 connections
to be transmitted within one link back to the BSC.
Frequency licensing, planning issues and installation
availability inhibit methods of connecting cellular sites
such as microwave solutions and leased lines.
Technical specifications
Typical range
4 000 meters and beyond
Fade margin
30 dB over 1 km (depending on product)
Capacity
T1 (1,544 Mb/s) – STM-1 (155 Mb/s) (depending on
product)
Transmitter
LED – Wavelength: 800 – 900nm
Power: ATPC up to 17 dBm
Beamwidth: 8 mrad
Receiver
Beamwidth: 9 mrad
Sensitivity: –39 to –52 dBm (depending on product)
Eye safety
Class 1. Eye-safe under all conditions
Network interface:
T1: 100ohm RJ48C UTP
E1: 120ohm RJ48C UTP
E1: 175ohm BNC Coax
Management interface
RS-232, SNMP option
Power
24 - 70V DC
Dimensions
43,2 cm x 25,4 cm x 43,2 cm
Weight
11,3 kg + mounting hardware
Environmental
Operating temperature: –40 ºC to 50 ºC
Storage temperature: –40 ºC to 60 ºC
Housing: IP66
Notes: For cold temperatures, optional heater
subassembly is available upon request. Specifications
subject to change without notice.
Ordering information
Description
WaveBridge™ cellular 700 series
Product Part number Distance
E1 700 Series PWTA 725 4 000 meters
T1 700 Series PWTA 726 4 000 meters
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