Compaq Armada 7300 Armada 7300 Family of Personal Computers Reference Guide - Page 161
Telephone Network Connection, disconnect pulse dialing or multifrequency tone dialing.
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Telephone Network Connection s The modem is suitable for connection to the Public Switched Telephone Network (PSTN) direct exchange lines and relevant branch systems (PBXs). s A ringer equivalent number (REN) is a value given to all apparatus to be connected to the PSTN. Its value can be taken and used to calculate the maximum number of equipment items that can be connected in parallel without impairing the performance of the standard bell circuit. t REN = 3/n where n is the maximum number of units that may be used in parallel. t The maximum REN of a line is 4; therefore, the total REN of all apparatus connected to the line (obtained by summing the individual REN values) should not exceed 4. This value includes any BT-provided instrument, each of which is assumed to have REN value of 1.0 unless otherwise stated. Exceeding the REN 4 = 4 value may cause your telephone(s) to ring weakly or not ring at all. t Only one modem should be connected to a telephone line. Connecting a modem in parallel with one or more telephone instruments is not allowed. t The REN for this piece of equipment is 1.0. s The exchange should provide facilities for either loop disconnect (pulse) dialing or multifrequency (tone) dialing. The modem can be configured to operate with either system. s During dialing, this apparatus may tinkle the bells of other telephones using the same line. This is not a fault, and we advise you not to call the Fault Repair Service. s The Compaq series 577 global modem specified in this guide is for the Compaq 2910 series of computers. s This apparatus has been approved for the following facilities: t Simple modem t Facsimile t Telephone answering machine functions t Speakerphone functions u Automatic call initiation u Detection of initial proceed indication B-12 Regulatory Notices