What is a Central Office?
A common carrier switching center facility that is conveniently located in areas to serve subscriber homes and businesses. They provide telephony services (lines) that are connected on what is known as a local loop. The central office contains switching equipment that can switch calls locally or to long-distance carrier telephone offices.
What is a local loop?
A local loop is the wired connection from a telephone company's central office. The system was originally designed for voice transmission only using analog transmission technology on a single voice channel. Today, computer modems make the conversion between analog signals and digital signals. With Integrated Services Digital Network (ISDN) or Digital Subscriber Line (DSL), the local loop can carry digital signals directly and at a much higher bandwidth than they do for voice only. Today, local loops may include a digital loop carrier system segment or a fiber optic transmission system referred to as fiber-in-the-loop.)
Why are Tinned Copper Conductors used in Central Office designs?
Historically, cable with tin copper conductors were selected and terminated in Central Offices by soldering the wire to a distribution frame terminal. As soldering has decreased, the tin copper conductor for this application has remained. Today tinned conductors are preferred to wire wrap onto tinned binding posts on various transmission pieces of equipment within central offices, remote terminals and premise telephone wire rooms. Tinned copper conductors with their associated insulation materials provide outstanding stripability, flexibility, and resistance to corrosion along with a gas–tight connection, which is electrically equivalent to a soldered connection from the past.
My upcoming project mandates that I use RoHS compliant cables. Are cables manufactured by Superior Essex RoHS compliant; do you have supporting documentation; and where can I find it?
Yes, Superior Essex manufactures RoHS (Restriction of Hazardous Substances) compliant products. These cables can be easily identified by the appearance of a RoHS logo located near the standards compliance box of our print and online product specification sheets. (Keep in mind that the most current information is available online.)
The Restriction on Hazardous Substances (RoHS) and Waste Electrical and Electronic Equipment (WEEE) directives are aimed at reducing the hazardous materials content in electronic products as well as increasing the recycling efforts for these products and became effective July 1, 2006. RoHS specifically bans or restricts the use of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated biphenyl ethers (PBDE).
General information on RoHS compliance is available on our Web at RoHS Compliance as well as on the RoHS website.
To obtain a stand-alone documents for a specific part number(s), contact your inside sales manager. He or she can provide the documentation.
If you have other questions concerning RoHS compliant cables manufactured by Superior Essex, please contact Technical Support at 877.263.2818 or via email.