Siemens RUGGEDCOM RSL910, Руководство по установке

Страница: 34 / 48

Chapter 4
Communication Ports
RUGGEDCOM RSL910
Installation Guide
24 EoVDSL Wiring
Figure 15: 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
CONTENTS
• Section 4.2.1, “EoVDSL Wiring”
• Section 4.2.2, “Configuration and Setup”
• Section 4.2.3, “EoVDSL Performance”
Section 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.