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Description
The Kenton Research
Switched Line Combiner and Splitter Unit MOD6951 has been designed
to be used in telecontrol applications where one central control
modem is to be connected to up to eight remote sites each equipped
with a 4-wire switched carrier modem. Signals from the control
modem pass through the unit and are sent to each remote site.
The response channel from a remote site is only switched through
to the control modem when valid modem tones are detected and
an interlock disables the other response channels. An antistreaming
timer will lock out any response channel with carrier on for
longer than the set period and allow the remaining channels
to function correctly. Robust modem tone detection techniques
provide fast reliable switching with excellent immunity from
spurious signals and noise.
The
unit incorporates level adjustment on each output port. Line
amplification with selectable amplitude HF equalisation on the
input ports allows use on copper cables. Powering is from an
external dc supply 19 to 60V dc positive or negative earth with
built-in over-voltage and under-voltage protection. Comprehensive
alarm and status outputs are provided for connection to SCADA
systems for remote monitoring and maintenance.
Construction
The unit is housed
in a wall-mounted DIN standard IP66 enclosure which houses a
eurocard subrack with hinged cover in the upper section and
a pcb backplane which extends down to the lower section. Removing
the cover on the lower section gives access to the pcb mounted
connectors for user wiring, power wiring to a Klippon screw
terminal block, safety earth to a M5 stud and all other connections
to Krone IDC connectors. Glands are provided on the base of
the unit for cable entry. A power supply module and control
card are fitted as standard in the eurocard subrack. Line cards
are fitted as required, 5 for a system with 4 remote ports up
to 9 for a system with 8 remote ports. Front panel LED indicators
and test access sockets are provided to assist commissioning
and maintenance.
An
adapter bracket is available to permit mounting in a standard
19" racking enclosure. |
