HDC-UHD Series User Guide
27
6.3.3 Category cable for extension
To ensure the best performance with category cables, select a high quality category cable type, ensuring
that proper pinning and pairing requirements are observed.
・
Cat5e UTP/STP and Cat6 UTP/STP can be used, but we recommend CAT.5E HDC cable* for optimal
performance.
・
If using STP cables, connect the FG connector to a local electrical ground bonding point. Without
bonding FG to ground, the shielding feature may not effectively eliminate interference. If using UTP
cables, it is still recommend that the FG connector be used.
・
The STP cables are less affected by interference or external noise than UTP cables.
・
Connectors for long-haul transmission are the same as that of eight-core modular connector used for
Ethernet, but the transmission system is not the same so that it cannot be connected to Ethernet.
・
The maximum transmission distance of a category cables is the shorter distance of the maximum
transmission distances of transmitter/receiver/sink device connected to the HDC.
・
Pin assignments: T568A or T568B straight
・
Do not pull the cable using excessive force. The allowable tension of the category cable is 110 N.
・
Do not bend the cable at a sharp angle. Keep the bend radius four times of the cable diameter or larger.
・
Do not clamp or tie the cable tightly; leave some space allowing the cable to move slightly.
・
If you use multiple category cables, we recommend keeping a distance between the cables or not to
place the cables closely in parallel.
・
Keep the category cable running as straight as possible. Looping or coiling the cable, causes it to be
more easily affected by noise; especially when using longer cable run lengths.
・
Do not place the cable in an electrically noisy environment, since high-speed impulsive noise may couple
into the category cable. Use of a high-output radio transmission device near the HDC or remote receivers
may interfere with or interrupt video and or audio signals.
・
If the total transmission distance from the transmitter to receiver is 328 ft. (100 m) or less, up to two cable
interconnection points can be used. Products supporting Cat6A (10GBase-T) are recommended. The
maximum transmission distance of high-resolution transmission, such as 4K, may be shortened by about
10% compared with other lower bandwidth resolution formats.
・
The table below shows supported transmission distance for each category.
Note that specified distances may shorten depending on the conditions within the actual environment.
[Table 6.2] Transmission distance
Noise
influence
Category
Transmission
distance
TMDS clock
Recommended cable
Easily
affected
UTP
Cat5e
164 ft.
(50 m)
≦
225 MHz
For 164 ft. (50 m) or longer:
CAT.5E HDC
*
, Cat5e STP, and
Cat6 UTP/STP cables
Cat6
328 ft.
(100 m)
230 ft.
(70 m)
> 225 MHz
(4K format)
For 4K format 230 ft. (70 m) or
longer:
CAT.5E HDC*, Cat5e STP, and
Cat6 STP cables
Less
affected
STP
Cat5e
*
Cat6
328 ft.
(100 m)
*
The CAT.5E HDC cable is a double-shielded category cable optimized for video signal transmission.
The double-shielded structure protects the video signal from external interference. It is certified to
500 MHz bandwidth at distances up to 328 ft. (100 m) and verified to meet requirements specified by
HDBaseT Alliance.
