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1.
All HDMI over CAT5 transmission distances are measured using Belden Cat-5e 125MHz LAN cable and
ASTRODESIGN Video Signal Generator VG-859C. The transmission distance is defined as the distance between the
transmitting unit (TX) and the receiving unit (RX).
2.
The transmission length is largely affected by the type of LAN cables, the type of HDMI sources, and the type of HDMI
display. The testing results show solid LAN cables (usually in bulk cable [300m/1000ft] style) can transmit signals a lot
longer than stranded LAN cables (usually in patch cord style). Shielded STP cables are better suited than unshielded
UTP cables. A solid UTP CAT5e cable shows longer transmission range than stranded STP CAT6 cable. For long
transmission applications, solid UTP cables are the only viable choice.
3.
EIA/TIA-568-B termination (T568B) for LAN cables is recommended for better performance.
4.
To reduce the interference among the unshielded twisted pairs of wires in UTP cable, one can use shielded STP cables
to improve EMI problems, which is worsen in long transmission.
5.
Because the quality of the Cat-5/5e/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.
If your HDMI display has multiple HDMI inputs, it is found that the first HDMI input [HDMI input #1] generally can
produce better transmission performance among all HDMI inputs.
Performance Rating
Type of Category Cable
Wiring
Shielding
CAT5
CAT5e
CAT6
Unshielded (UTP)
Solid
Shielded (STP)
Unshielded (UTP)
Stranded
Shielded (STP)
Termination
Please use EIA/TIA-568-B termination (T568B) at any time
Notice