Aastra OpenCom 130 User Guide - Page 53
a/b Ports, OpenCom 131. In this case, an electronic switch enables the low-frequency - manual
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Installation Port Assignment, Termination, Cable Lengths The maximum permissible length of the twin-wire cable on a Upn port is 500 m. This line may only be laid inside buildings. The maximum permissible length of the twin-wire cable on a Upn port of an interface card is 1,000 m when 0.6 mm cable (with twisted pairs) is used (these interface cards are available for an OpenCom 130 / 150). The power consumption of each Upn port is approx. 3 W. S0int 2a 2b 1a 1b Upn/RFP with 1 Upn 12345678 RFP with 2 Upn 12345678 12345678 Pin assignment of the S0 and Upn ports 3.10.3 a/b Ports The a/b ports are for operating analogue devices (e.g. a fax machine, modem or telephone). The maximum permissible length of the cable is 1,000 m when twinwire 0.6 mm cable (with twisted pairs) is used. Doorstation equipment can be activated on an a/b1 port (OpenCom 130, OpenCom 131). In this case, an electronic switch enables the low-frequency voltage to be separated from the feed. Tip: It is possible to operate analogue trunk lines with an addi- tional interface card. Further explanations regarding this in- terface card can be found in the "M100-AT4 Interface Card" manual. 51