REN number
The REN number of this telephone is 1.
If you wish to connect any other equipment to the line, simply add the REN numbers of each piece together and ensure that the total does not exceed 4. If too many phones are connected to the line, the circuit may be overloaded and your telephone may not ring.
Not all telephones have the same REN. If a British Telecom phone is supplied unmarked, you can assume that it has a REN of 1
Handsfree speaking / On hook dialling
This telephone is designed to work on most telephone lines by drawing power from the line. However, when using the
This telephone requires the use of batteries for memory back up ( see Figure 2 ) and, in the event of insufficient line power, the batteries also provide an additional power source for loudspeaking operation.
Emergency calls
"999" calls can be made on this telephone, for the purpose of making calls to the emergency service. An access code may also be required, if the phone is connected to a PABX.
Audible tones
This telephone is provided with a "valid" and an "invalid" audible tone. Whenever a button is pressed following a valid operation, e.g. dialling a number from memory, a short high pitched sound will be heard. If an incorrect operation is attempted, e.g. pressing a memory button when no memory is present, then a low pitched sound will be heard.
3