3170-avs.ib.rev5.doc
page 3 of 16
16/10/2007
General description
The AVS-3170 5 x 1 relay switcher for video and RF is a passive unbalanced circuit relay switcher.
The relays used are low capacitance reed relays wired to minimise crosstalk from the unused inputs and thus allow
the switcher to be used with RF or video signals in excess of 140 MHz.
This also allows the switcher to be used for high-speed digital signals with minimal effect on the pulse risetime.
When used at very high data rates the small amount of high frequency attenuation may be corrected by following
the switcher with a data distribution amplifier. This not only provides automatic equalisation, but also source
isolation and multiple outputs.
Termination resistors for 75
Ω
signals are fitted as standard. These may be easily changed to 50
Ω
for RF signals or
removed for switching TTL or other signals.
When the switcher is not powered, relay 1 circuit switches input 1 to the output thus providing a secure path during
power failures.
The AVS-3170 5 x 1 relay switcher is designed to interface with other IRT Eurocard 3000 series switchers or with
the VG-737 video and AG-738 audio program fail detectors.
The switcher may be fitted with a local control panel, type CPS-3050, or with a tally panel, type TPS-3010, for local
path indication when the switcher is operated remotely.
The AVS-3170 is built to the IRT Eurocard format and may be mounted in any of IRT's standard Eurocard frames
together with other Eurocard modules.
Standard features:
•
Suitable for video, RF, ACS or high speed digital signals.
•
May be used for G.703 MPEG transport streams.
•
Economical switcher for 2, 8, 34 & 45 Mb/s data signals.
•
Termination impedance may be easily changed from 75
Ω
to 50
Ω
or open circuit.
•
Default path from source 1 on power fail.
•
Compatible with 3000 series switchers or wire per crosspoint control.
Accessories available: -
FRU-3000 Eurocard module mounting frame
Mounts up to 12 Eurocard modules and one PSU-
3000 Dual AC power supply side by side in 134 mm
of standard rack space (3 Rack Units).
FRU-1030 1 RU chassis conversion/PSU
Converts Eurocards to a 1 rack unit format. The
FRU-1030 can be fitted with either one or two
Eurocards in a horizontal side by side format. A
single AC power supply is included to power the
cards.
TME-6 Eurocard extender board.
Instruction Book.