Brother International FAX 275 Service Manual - Page 198

14 CHAPTER TWO If you are installing the fax machine to work with a PBX: I It is not guaranteed that the unit will operate correctly under all circum- stances with a PBX. Any cases of difficulty should be reported first to the company that handles your PBX. 2 If all incoming calls will be answered by a switchboard operator, it is recommended that the Answer Mode be set to MANUAL. All incoming calls should initially be regarded as telephone calls. 3 The unit may be used with either pulse or tone dialing telephone service. Custom Features on Your Phone Line If you have telephone services (offered by your telephone company) on your phone line, please see Telephone Service, chapter 9. Connecting an External Telephone Answering Device (TAD) Sequence You might choose to connect an additional answering system. When you have an external TAD on the same telephone line as the fax machine, the TAD answers all calls. The fax machine "listens" for fax calling (CNG) tones. If it hears them, the fax machine takes over the call and receives the fax. If it doesn't hear CNG tones, the fax machine lets the TAD continue playing your outgoing message so your caller can leave you a voice message. The TAD must answer within four rings (the recommended setting is two rings). The fax machine cannot hear CNG tones until the TAD has answered the call, and with four rings there are only 8-10 seconds of CNG tones left for the fax "handshake." Make sure you carefully follow instructions in this manual for recording your outgoing message. We do not recommend using the toll-saver feature on your external TAD if it exceeds 4 rings.