The interaction of telephony and video signaling places special demands on VDSL2 splitters. When a telephone is “off-hook,” the battery at the central office provides -48VDC over the phone line. When the phone is ringing, peak ring voltage is 127 volts. If the subscriber answers the phone (a condition called “ring trip”) at the negative peak of the voltage cycle, the instantaneous voltage (a combined -48VDC from the CO battery and -127 from the ringer) adds up to -175 volts. When this happens, an ordinary splitter can allow high-voltage, high-frequency transients to enter and interfere with the VDSL2 spectrum. This, in turn, can cause corruption or loss of data packets and interference with video signals.
For VDSL2, as the cable length from the DSLAM (Digital Subscriber Line Access Multiplexer) to the customer premise increases, signal strength decreases and the line becomes more susceptible to noise. Additionally, every component or extension that is attached to the cable between the DSLAM and the customers will also introduce impedances that will either reduce the signal strength further increasing the insertion loss, add signal reflections decreasing the return loss, or degrade the balance of the twisted pair cable increasing the noise.
Due to the frequency sensitivity of the HomePNA signal there are a few things that should be considered when training technicians installing HomePNA over coax.
According to LAN Magazine, “85-95% of network failures are due in large part to cabling problems.”
As speeds and bandwidth increase, slight errors in installation CAN make the system non-compliant and MAY make a network useless so consider the following list of cabling tips:
One technique of extending broadband access to end users located beyond the serving radius is to use pair bonding. With pair bonding, the broadband access service is deployed using two DSL access lines where the sum of the bit rates from each line are used to provide the objective distance needed for access area. Alternatively, pair bonding can be used to increase the bit rate available to the customer for enhanced service quality.
The HDMI Specifications do not specify cable lengths. However, for long cable runs the following is recommended:
If you need to send a 1080p signal more than 25feet, or a 1080i signal more than 49 feet, active electronics will help clean up and boost an HDMI signal when it’s traveling long distances. You can purchase either a stand-alone booster or an active cable, where the circuitry is embedded in the connectors themselves. In both cases, the connection requires a power source.
Assortment of color rings for video connectors such as our SURE Lock™ F connectors make identifying cables and wires trouble-free. Once the SURE Lock™ compression connector is compressed on to the cable, professional installers simply slide the selected color ring over the connector for easy identification. These colors are defined by industry standards to make commonly used connections for electronic devices in a home theater system easy to identify. Here are a list of signal connections that reference the CEA-863-A standard for “Connection Color Codes for Home Theater Systems.”
When installing coax cable externally it is very important to ensure the cable is weatherproofed. This is critical because any moisture entering the coax cable will produce a large increase in the level of loss. If any moisture passes into the dielectric material it will cause impairment to the performance of the dielectric, and also increase the level of loss. It is extremely important to seal the end of the cable if it’s used externally with the proper connector to ensure that no moisture enters the connector and in turn the cable. It is also important to ensure that the outer jacket of the cable remains intact and is not damaged during installation in any way.
A single cable layout is pretty straightforward but there are several things to keep in mind when you design a system.
When considering what type of coax cable in a residential application there are two common choices: either an RG-6 or RG-59 cable type. Though both cables are 75Ω characteristic impedance cable types, RG-59 cable has a 20 AWG center conductor while RG-6 cable has an 18 AWG center conductor.
RG-59 with it’s smaller center conductor is suitable for use with baseband video frequencies, such as composite video, but its high-frequency loss is too great for use with broadcast frequencies over distance greater then a few feet. RG-6 on the other hand provides less high-frequency loss in a manageable size. However, remember that even RG-6 is available in many different quality configurations so be sure to pick a cable with proper shielding and center conductor materials. We recommend a quad-shield RG-6 cable with a solid copper center conductor for most residential installations.
All of Suttle’s SOHO Access™ Enclosures (and most of our other products) are marked cULus meaning that these products are dual listed for both the Canadian market as well as the US market.
Certain enclosure sizes in the Suttle product portfolio can provide a dedicated secure space inside the tenant’s home for the management of voice, data and video products as well as the fiber equipment such as the ONT and power supply used in the deployment of FTTH services. Suttle is providing this solution to several of its customers to support the delivery of their FTTH initiatives. The SOHO Access™ enclosure should be in a location that is accessible for cabling maintenance. When ever possible, the location should be centralized within the home to minimize the length of outlet cables according to guidelines provided by the EIA/TIA 570 B residential telecommunications infrastructure standard. For a quick overview of these guidelines follow this link: http://en.wikipedia.org/wiki/TIA_570B.
People often confuse the TIA/EIA-568-B wiring standard with the T568A or T568B pin/pair assignment defined in this standard. According to this excerpt taken from Wikipedia.org, “TIA/EIA-568-B specifies that horizontal cables should be terminated using the T568A pin/pair assignments, or, optionally, per [T568B] if necessary to accommodate certain 8-pin cabling systems.” Despite this instruction, many organizations continue to implement T568B for various reasons, chiefly associated with tradition (T568B is equivalent to AT&T 258A). The United States National Communication Systems Federal Telecommunications Recommendations do not recognize T568B.”
Did you know that the limit for a field terminated modular plug is 32.8ft (10 meters)? Many installers incorrectly attempt to terminate these modular plugs on both ends of a cabling drop even though the average drop length in a residential home-run wiring system is 75ft (23 meters).