Ringer Equivalence Number REN, Hook Flash, Guard Tone

Regulatory Notices

The output power of this modem is fixed and cannot be changed by the user.

The approval mark attached to this product indicates that the modem itself carries BABT approval. No approval is conferred on the host computer or the serially connected computer and the label must not be transferred to the case of the computer. A copy of the approval label may be attached to the telephone line cable. The approval label must not be removed. The text of the approval mark is reproduced below:

APPROVED for connection to telecommunications systems specified in the instructions for use and subject to the conditions set out in them.

The modem does not incorporate circuitry to suppress bell-tinkle during pulse dialing. When used with some electronic ring type telephones and on two wire circuits that bell tinkle will occur during pulse dialing. This is not a fault and we advise you not to call the Fault repair service. This modem is not approved for use with parallel connected telephones when used in public dialing mode.

Ringer Equivalence Number (REN)

REN is a customer guide to indicate the maximum number of apparatus that may be connected simultaneously to a single telephone line without affecting the bell (or tone) ringing characteristics of the items connected. The REN of each line connection of the modem is 1. To calculate the maximum number of items that may be connected to a single exclusive telephone line add all the REN values of the connected equipment. The total should be 4 or less. Unmarked telephones are assumed to have a REN of 1. All other equipment must be clearly marked with it REN value. If a REN of 4 is marked on the apparatus, then only apparatus marked with a REN of 0 (zero) are permitted to be connected simultaneously. Because of the wide spread of characteristics a guarantee of successful operation in an installation of mixed types of equipment may not be given by the supplier.

This apparatus has a REN of 1.0 for each line connection.

Hook Flash

The XircomUser’s Guide refers to “Hook Flash’ using the “!” dial modifier. For use in the UK this modifier generates a momentary break of 95 ms (not 600 ms) in accordance with UK type approval regulations. This timing is fixed.

Guard Tone

By default the &Gn command is set to n=2 (1800 Hz).

Speaker Control

The Mn command controls the signal presented to the host PC. There is no speaker on the modem itself.

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