HDC-TH401/201/101 User Guide
18
5.2.3 Twisted pair cable for long-haul transmission
When connecting a twisted pair cable to the HDC, please observe the following precautions.
・
Cat5e/Cat6 UTP/STP can be used, however, we recommend a CAT.5E HDC cable* for the twisted pair
cable which is developed by IDK to maximize quality of video transmission.
・
If using an STP cable, connect the FG connector to an earth ground source. Otherwise, the shielding
feature does not work correctly. When using a UTP cable, we still recommend using the ground connector.
・
The shielded STP cables are less affected by interference or external noise than UTP cables.
・
The connector for twisted pair cable is as same as the connectors which are used for Ethernet (8 core
modular type connector), however, it cannot be connected and use for Ethernet because the way of data
transmission is different.
・
The maximum extension distance of Cat5e/Cat6 UTP/STP cable is the shorter maximum extension
distance of the connected HDC receiver and sink device.
・
For pin assignments, apply T568A or T568B standards for straight through wiring.
・
Do not give connection cables a strong pull. The allowable tension of the twisted pair cable is 110 N.
・
Do not bend the connection cable at a sharp angle. Keep the bend radius four times of the cable diameter
or longer.
・
Do not tie the cable tightly; leave a space allowing the cable to move slightly.
・
If you use the same cables, we recommended keeping a distance between the cables or not to place the
cables closely in parallel.
・
Keep the twisted pair cable as straight as you can. If you coil the cable, it is easily affected by noise.
・
Do not place this product in an electrically noisy environment, since high-speed signal is transmitted.
Particularly when you use a high-output radio around this device, video or audio may be interrupted.
・
If the distance between the transmitter and receiver is 197 ft. (60 m) or shorter, up to two cable couplers
can be used. Couplers supporting Cat6A (10GBase-T) are recommended.
・
Following table shows extension distance by each twisted pair cable. The extension distance depending
on installation environment.
[Table 5.1] Twisted pair cable and extension distance
Noise
influence
Category
Distance
TMDS clock
Remarks
Easily
affected
UTP
Cat5e
98 ft. (30 m)
≦
225 MHz
For 98 ft. (30 m) or longer,
Cat5e STP, Cat6 UTP/STP,
CAT.5E HDC
*
cables are
recommended.
Cat6
197 ft. (60 m)
Less
affected
STP
Cat5e
*
Cat6
197 ft. (60 m)
*
The CAT.5E HDC cable is a double-shielded twisted pair cable that optimizes video signal transmission.
It is certified to 500 MHz bandwidth at distance up to 328 ft. (100 m) and verified to meet requirements
specified by HDBaseT Alliance. The double-shielded structure protects video signal from outside
interference.
Note:
If there is a problem in the transmission path, video or audio may be interrupted. Check the precautions above.
If the problem still cannot be solved, shortening the twisted pair cable may remedy the problem.
