Ericsson Componedex specialises in the supply of communications
systems for use with satellite, terrestrial and wireless
Ericsson Componedex design, install and maintain high
availability satellite data networks. The earth station
equipment at the network hub or at critical nodes is
often made dual redundant with automatic switching between
live and standby systems in the event of any failure
to ensure a high overall system availability.
Ericsson required the ability to remotely monitor earth
station equipment performance from their offices or
out of hours by engineering staff from their homes.
This would enable a speedy identification and subsequent
replacement of faulty equipment. A further requirement
was the ability to remotely control the uplink site
equipment configuration to assist with fault diagnosis
or to take suspected faulty equipment out of service
The PicoServ miniature web server module together with
the PicoServ digital I/O module was chosen due to its
low cost and flexible configuration options.
A typical earth station uplink facility consists of
two sets (live and standby) of satellite modem, up-converter
and high power amplifier plus a waveguide switch for
connecting either the live or standby equipment sets
to the satellite antenna.
Each piece of equipment at the uplink site provides
a fault summary alarm output which is connected to an
input on the digital I/O card. This enables the fault
status of each unit to be displayed in the browser.
In addition one of the digital I/O module outputs is
used to provide remote manual control of the waveguide
switch. The PicoServ web server module is connected
to the Internet via the local LAN allowing Ericsson
engineering staff to access the site from office or
The system configuration is illustrated in the diagram
Construction of the user interface HTML page was straightforward.
Each unit at the uplink site is displayed as an image,
with a clear unit status shown below. The OK or FAULT
status is displayed according to the state of the alarm
input at the digital I/O module.
Manual control of the live equipment is via two chain
select buttons. A hyperlink assigned to each button
selects the appropriate state of an output on the digital
I/O module which controls the state of the waveguide
The browser window used to monitor and control the
uplink site is shown below.