Brother International MFC 8500 Service Manual - Page 214
WSW47, WSW48 to WSW50, external telephone.
UPC - 012502603832
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Selector No. 1 2 3 4 5 | 8 WSW47 (Delay of FAX line disconnection) Function Setting and Specifications Not used. Delay of FAX line disconnection when switching to the pseudo-ringing external telephone No. 3 4 00 : 01 : 10 : 11 : 200 ms 400 ms 700 ms 1000 ms Not used. NOTE: Selectors 3 and 4 are applicable only to models supporting pseudo-ringing of a connected external telephone. l Selectors 3 and 4: Delay of FAX line disconnection when switching to the pseudo-ringing external telephone When the equipment receives a phone call, it can make the connected external telephone ring (so called pseudo-ringing). During pseudo-ringing, if you pick up the handset of the external telephone, the line might be disconnected due to cut-off of the line current. To hold the line, the equipment may supply line current by making use of the pulse generator circuit that forms a parallel loop. This way the FAX line disconnection may be delayed. These selectors determine the delay period. Selector No. 1 | 8 Not used. Function WSW48 to WSW50 Setting and Specifications 47