SC75A045B-A Datasheet, PDF (1/2 Pages) Faraday Technology – 4 SWITCH CABLE CLONE

4 SWITCH CABLE CLONE
SIMULATES THE EFFECT OF COAXIAL CABLE IN SERIAL DIGITAL SYSTEMS
• Emulates cable up to 360 MHz
• Simulates more than 300 metres
• Fixed and Switched Programmable
• Known accurate loss for repeatable performance
• Quick and easy to use
• No power needed
• Pocket size
Order Code
SC75A045B-A
SC75A375B-A
Cable Type
BELDEN 8281
BELDEN 8281
Simulated Lengths
5m + 10m + 10m + 20m
25m + 50m + 100m + 200m
SC75A045B-B
SC75A375B-B
SC75A37B
BBC PSF 1/2M
BBC PCF 1/2M
see table opposite
5m + 10m + 10m + 20m
25m + 50m + 100m + 200m
In serial digital applications it is known that a signal
adhering to the amplitude specification of 800mV +
10% will maintain its integrity if the attenuation at the
Nyquist frequency is 30dB or less. It may then be
reconstituted correctly by, say, the Sony deserialiser.
The CABLE CLONE has similar attenuation vs
frequency characteristics to coax cable over the wide
frequency spectrum of the serial digital signal. When
installing or testing serial digital equipment it is often
necessary to establish the maximum length of cable
over which the signal will remain useable, or to ensure
there is sufficient margin (headroom) if a certain length
of cable is required. Most adaptive equalisers, in
deserialisers for example, rely on the attenuation
characteristics of the cable to operate correctly.
At present the only way to do this is to insert the actual
length of cable into the path. This is time consuming,
inconvenient and costly.
The Faraday CABLE CLONE is the solution to the
problem.
SC75A37B
Cable Type
Switch 2 Switch 5 Switch 10 Switch 20
BBC PSF 1/2M
25
BELDEN 8281
25
BBC PSF 1/3M
19
RG59
18
50
100
200
50
100
200
39
78
156
36
72
144
The CABLE CLONE emulates the loss and group
delay frequency characteristics of a cable to
approximately 360 MHz. It is supplied in a small metal
box fitted with BNC connectors which needs no power
supply. It my be carried in the pocket and is always
ready for immediate use.
By using the table on the reverse of the SC75A37B
box the user can relate the loss to lengths of various
types of cable.
Fixed CABLE CLONES of 1dB to 20dB and a Four
Switched Programmable version containing 2:5:10 and
20dB are available for all the various systems with
75Ω for video and 50Ω for Ethernet. An Eight
Switched Programmable version simulating
5:10:10:20:50:100:100 and 200 metres of Belden cable
is also available.
Apart from the smaller space requirements of the cable
clone (vs cable) it offers the advantage that comparable
measurements become possible since the influence of
manufacturing tolerances, customary in the case of
coaxial cables, is abolished.
© Faraday Technology. As part of continual product improvement the specifications, details and dimensions shown in this publication are subject to change without notice
Fara234d.doc
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May-02(C)