A ఏకాక్షక కేబుల్("కోక్స్" in English) is a cable composed of two కోక్స్ial, mutually insulated cylindrical metal conductors to form a basic unit (కోక్స్ial pair), మరియుthen a single or multiple కోక్స్ial pairs. It has been used to transmit data మరియుvideo signals for a long time.
It is one of the first media to support 10BASE2 మరియు10BASE5 Ethernet, which can achieve 10 Mb/s transmission up to 185 meters or 500 meters, respectively. The term "కోక్స్ial" means that the central conductor of the cable మరియుits shield have the same axis or center point. Some ఏకాక్షక కేబుల్s may have multiple shielding layers, such as a four-shielded ఏకాక్షక కేబుల్, which contains two layers of shielding, మరియుeach layer of shielding is composed of aluminum foil wrapped with wire mesh. The shielding characteristics of ఏకాక్షక కేబుల్ make it have strong anti-electromagnetic interference ability మరియుcan transmit high-frequency signals over long distances. There are many different types of main types of ఏకాక్షక కేబుల్s that support a wide range of professional applications, such as satellite communications, industrial, military మరియుmarine applications. The three most common types of non-industrial ఏకాక్షక కేబుల్s are RG6, RG11మరియుRG59, వీటిలోRG6లో సాధారణంగా ఉపయోగిస్తారుసిసిటివి మరియుCATVకార్పొరేట్ పరిసరాలలో అనువర్తనాలు. యొక్క సెంటర్ కండక్టర్RG11కంటే మందంగా ఉంటుందిRG6, which means that its insertion loss is lower మరియుthe signal transmission distance is longer.
అయితే, మందంగా ఉంటుందిRG11 తంతులు are more costly మరియుvery difficult to bend, which makes them unsuitable for deployment in internal applications, but more suitable for long-distance outdoor installations or straight backbone links. RG59కంటే సరళమైనదిRG6, but its loss is higher. It is rarely used in other applications except for low-bandwidth, low-frequency analog video applications (rear-view cameras in automobiles) with short distances మరియుlimited wiring space. ఏకాక్షక తంతులు also have different impedances-usually 50, 75, మరియు93 Ω. 50Ω ఏకాక్షక కేబుల్s have high power handling capabilities మరియుare mainly used in radio transmitters such as amateur radio equipment, civil bమరియుradio (CB) మరియుwalkie-talkies. 75 Ω cables can maintain signal strength well మరియుare mainly used to connect various types of receiving equipment, such as cable television (CATV) receivers, high-definition televisions మరియుdigital video recorders. 93 Ω Cఆక్సియల్ కేబుల్ was used in IBM mainframe networks in the 1970s మరియుearly 1980s, with very few applications మరియుexpensive. Although the 75 Ω ఏకాక్షక కేబుల్ impedance is most commonly encountered in most applications today, it is important to note that all components in the ఏకాక్షక కేబుల్ system should have the same impedance to avoid possible signal loss మరియుsignal loss at the connection point. Internal reflections that reduce video quality. The digital signal 3 (DS3) signal used in the central office (also known as T3 line) transmission service also uses ఏకాక్షక కేబుల్s, including 75 Ω 735 type మరియు734 type. The 735 type cable has a coverage distance of 69 meters, while the 734 type cable has a coverage distance of 137 meters.RG6 కేబుల్DS3 సంకేతాలను ప్రసారం చేయడానికి కూడా ఉపయోగించవచ్చు, కాని కవరేజ్ దూరం తక్కువగా ఉంటుంది.