NOTICE
1. All the transmission distances are measured using Belden CAT-5e 125MHz Solid cable and
ASTRODESIGN Video Signal Generator VG-859C. The transmission distance is defined as the
distance between the SP-9112 and the remote VGA display.
2. The transmission length is largely affected by the type of Cat-5/5e/6 cables, the type of VGA sources,
and the type of VGA display. The testing result shows solid UTP cables (usually in the form of 300m
[1,000ft] bulk cables) can transmit a lot longer signals than stranded UTP cables (usually in the form of
fixed length patch cords). Shielded STP cables are better suited than unshielded UTP cables. A solid
UTP Cat-5e cable shows longer transmission range than stranded STP Cat-6 cable. For long
extension applications, solid UTP/STP cables are the only viable choice.
3. EIA/TIA-568-B termination (T568B) for Cat-5/5e/6 cables is recommended for better performance.
4. To reduce the interference among the unshielded twisted pairs of wires in Cat-5/5e/6 cable, one can
use shielded STP cables to improve EMI problems, which is worsen in long transmission.
5. Because the quality of the CAT5/6 cables has the major effect on how long the transmission limit can
achieve and how good is the received picture quality, the actual transmission range is subject to one's
choice of Cat-5/5e/6 cables. For desired resolutions greater than 1080i or 1280x1024, a Cat-6 cable is
recommended.
6. The RS-232 channel for all the connected receivers actually share the same path, and therefore the
system designers must be aware of that the feedback after each serial command sent by the source
must only happen once on one remote device or no feedback at all to avoid interfaces from different
receivers!
Performance Guide for HDMI over Category Cable Transmission
Performance rating
Type of category cable
Wiring
Shielding
CAT5
CAT5e
CAT6
Solid
Unshielded (UTP)
Shielded (STP)
Stranded
Unshielded (UTP)
Shielded (STP)
Termination
Please use
EIA/TIA-568-B
termination (
T568B
) at any time
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