| 释义 |
Cat 1 (Category 1) A type of cabling that is specified in ANSI/ICEA S-80-576 and ANSI/ICEA S- 91-661, but is not recognized in either the EIA/TIA or ISO/IEC standards. Cat 1 is obsolete in telecommunications applications, but much remains in place in applications such as POTS and ISDN BRI telco local loops, analog PBX and key telephone systems, inside wire and cable systems, low speed data cables (e.g., RS-232 and RS-422), alarm cabling, and audio speaker wire. Cat 1 runs over unshielded twisted pair (UTP) of unspecified gauge and is rated at less than 1 MHz, but typically supports bandwidth less than 100 kHz. In ISO/IEC 11801 terms, Cat 1 variously falls into Class A (≤ 100 kHz) and Class B (≤ 1 MHz). See also bandwidth, gauge, ISDN BRI, POTS, and UTP. |