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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.
Specifications
| Line Interfaces |
Transformer coupled main port plus
up to 8 branches,
Selectable 600 or 1200 ohm impedance, 3kV ac isolation.
User wiring to Krone IDC connectors.
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| Power |
19 to 60V dc
positive or negative earth, 150mA maximum.
Over and under voltage protection, 300mA PTC and 500mA a/s fuse.
Wiring to Klippon 10A screw terminal block, protective earth to M5
stud. |
| Line Card |
Nominal input
/ output levels 0dBm (-13dBm modem tones).
Front panel test monitor / access points type 247A.
Front panel LED indicators for detected carrier and time-out.
RX amplification 0 to 15dB in 1dB steps with selectable HF equalisation.
TX amplification 0 to 15dB in 1dB steps.
Carrier on detect level (after amplification) -28dBm @ 1700Hz
-24dBm @ 1300/2100Hz.
Carrier on detect time 4ms.
Carrier off detect time - branch 6ms,
main 250ms. |
| Control
Card |
Front panel
LED indicators for system ready and detected response.
Front panel test access (socket type 247A) to monitor control and
response signals.
PCB mounted hex switch sets anti-streaming from 0 to 15sec in 1sec
steps. |
| Power Supply
Card |
Front panel
LED indicators show status of derived voltages. |
| Volt Free |
Supply fail,
unit fail, main port carrier fail, branch timeout (one per branch),
rating 60V / 100mA max, 1kV ac
isolation.
Wiring to Krone IDC connectors. |
| Approval |
TBR17 pan European
4-wire leased line. |
| CE Marking |
TTE, EMC to
BS EN 55022 class B & BS EN 50082-2 industrial, LVD,
safety to BS EN 60950. |
| Dimensions |
236 x 353 x
237mm H x W x D. |
| Operating
Temperature |
-10 to+55 deg
C. |
| Enclosure
Protection |
IP66. |
Line
Combining Unit - Front View
(Terminal Cover Removed)
| Part Number |
Description |
| Main
Systems |
| MOD 6951-4 |
LCU, 1 main
and 4 remote ports |
| MOD 6951-5 |
LCU, 1 main
and 5 remote ports |
| MOD 6951-6 |
LCU, 1 main
and 6 remote ports |
| MOD 6951-7 |
LCU, 1 main
and 7 remote ports |
| MOD 6951-8 |
LCU, 1 main
and 8 remote ports |
| Optional |
| MOD 6951PU |
Mains Power
Supply 220/240V |
| MOD 6951RM |
Adapter Kit
for 19" rack mounting |
| MOD 6951EXT |
Card Extender
3Ux220 |
| MOD 6951BAT |
Battery set
24V 1.8 A/M |
| TLBT247A2M5P4 |
Test Lead BT247A
to 4mm |
| Spares |
| MOD 6951-0 |
LCU Housing
Complete with Backplane |
| MOD 6951-1 |
Power Supply
Card |
| MOD 6951-2 |
Controller Card |
| MOD 6951-3 |
Line Card |
Mains
Power Supply
MOD 6951PU
The mains power
supply operates from a mains supply 200 to 240 VAC and provides
a regulated output of 24VDC at 1 Amp. The supply may be fitted with
battery back up which operates an LCU for up to 12 hours in the
event of a mains failure.
The
power supply may be wall mounted or fitted to the rear of the 19"
rack adapter bracket. LED's on the unit give mains and battery status.
Conforms to EN6090 and VDE 0871-B.
Adapter Kit
MOD 6951RM
The adapter kit enables the LCU to
be mounted in a standard 19" rack. The total height of the
bracket is 6U, an extra 1U should be allowed at the bottom for cable
entry. The mains power supply may be fitted to the rear of the bracket
with the fixing supplied.
Card Extender
The
card extender allows the operation of a line card outside the LCU
card frame. This may be used for setting up or fault finding.
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KENTON RESEARCH LIMITED
Unit 19, Bourne Industrial Park, Crayford
Kent DA1 4BZ
Tel: 01322 552000 Fax:
01322 552020
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