Communication Ports
4.2.1 EoVDSL Wiring
Pin-Out
The following is the pin-out for the EoVDSL terminal block:
Figure 4.4
EoVDSL Terminal Block
Terminal
Description
R9
Receive on Port 9
T9
Transmit from Port 9
R10
Receive on Port 10
T10
Transmit from Port 10
4.2.1
EoVDSL Wiring
VDSL operates over 2-wire Category 3 (CAT-3) or higher twisted-pair wiring. Other
twisted-pair wiring with similar characteristics may work, although the performance
will vary depending on the cable characteristics and distance.
When wiring EoVDSL terminals, note the following:
• EoVDSL terminals are designed to be used on private communications lines for
point-to-point connections and are not to be connected to the Public Switched
Telephone Network (PSTN).
• To reduce the risk of fire, use only #26 AWG or larger telecommunication line
cord.
• Twisted-pairs are an effective way of reducing both magnetic and capacitive
interference, as they reduce the magnetic loop area to nearly zero and maintain
a consistent distribution of capacitances to both ground and other sources.
Therefore, make sure twisting is consistent throughout the cable length.
• Open leads (also known as bridged taps or drop-lines) along the length of the
cable will cause an impedance mismatch and result in VDSL signal degradation.
• Make sure the cable impedance is consistent throughout the cable run. Avoid
mixing different wiring (e.g. wiring with different gages) in cable runs, as this
will cause an impedance mismatch and result in VDSL signal degradation.
• Make sure wiring is adequately separated between power and control circuits.
Switching spikes and surges in power and control circuits can couple noise onto
the VDSL line, causing interruptions in communications.
• Lower speeds are less susceptible to interference and will transmit greater
distances over the same wiring than higher speeds. Use the minimum speed that
will provide adequate data transfer speed.
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RUGGEDCOM RSL910
Installation Manual, 04/2022, C79000-G8976-1305-13
