KRAMER ELECTRONICS LTD
3
1.2 Factors Affecting Quality of Results
The factors affecting the quality of results when video or audio signals are transmitted from a source to an
acceptor are:
Connection cables
Low quality coaxial cables are susceptible to interference; they degrade signal
quality due to poor matching and cause elevated noise levels. They should
therefore be of the best quality. The fiber optics system is no exception to this
rule.
Sockets and connectors of
the sources and acceptors
So often ignored, they should be of highest quality, since "Zero Ohm" connection
resistance is the objective. Sockets and connectors also must match the required
impedance (75ohm in video). Cheap, low quality connectors tend to rust, thus
causing breaks in the signal path. The sockets’ quality is critical for proper optic
fiber signal transmission as bad sockets cause energy loss and fast signal
degradation.
Distance between sources
and acceptors
Plays a major role in the final result. For long distances (over 15 meters) between
sources and acceptors, special measures should be taken in order to avoid coaxial
cable losses. These include using higher quality cables or adding line amplifiers.
Interference from
neighboring electrical
appliances
These can have an adverse effect on signal quality. Balanced audio lines are less
prone to interference, but unbalanced audio should be installed far from any
mains power cables, electric motors, transmitters, and so on, even when the
cables are shielded. The optic fiber system is practically immune to electric
interference, as the signals transmitted along the optic fiber are rays of light and
not electrical signals.
2 SPECIFICATIONS
T-611R Set
FUNCTION
Fiber optic Video Transmitter / Receiver
INPUTS
Composite Video, 1Vpp/75 ohm on a BNC
(
611T
), Optic Fiber ST connector (
611R
).
OUTPUTS
Optic Fiber ST connector (
611T
), Composite
Video, 1Vpp/75 ohm on a BNC (
611R
).
OPERATION RANGE:
Up to 5km (Multimode).
VIDEO BANDWIDTH
55 MHz (-3dB), 20 MHz (-0.1dB).
VIDEO S/N RATIO
Better than 60 dB.
DIFF. GAIN:
<0.4%.
NON-LINEARITY
<0.6%.
CONTROLS
Gain and cable Equalization on both the
611T
and the
611R
.
DIMENSIONS
12cm X 7.5cm X 2.5cm (4.7"x 3 "x 2", W, D, H.)
WEIGHT
0.27 kg. (0.59 Lbs.) Approx.
POWER SOURCE
12 VDC, 80mA (
611T
), 40mA (
611R
).
3 HOW DO I GET STARTED?
The fastest way to get started is to take your time and do everything right the first time. Taking 15 minutes to
read the manual may save you a few hours later. You don’ t even have to read the whole manual. At the
beginning of each section, you’ ll find an overview of the section. If the section doesn’ t apply to you, you don’ t
have to spend your time reading it.
