Until now, users of Asterisk and other PC-based systems with T1/E1 or BRI connections needed a separate external analog line at an additional cost if they wanted reliable fax service. Fax machines connected to a PBX using T1/E1 or BRI connections would run inconsistently at best because the analog interface supporting the fax machine were not synchronized with the PSTN timing.
CABL-633 — Connect two cards in total, one master clock source and one slave.
Sangoma's latest AFT hardware & firmware revisions include an option for the analog card to receive its clocking from a T1/E1 or BRI card via a simple two-wire jumper cable.
Hardware Requirements
List of currently supported hardware:
AFT A101/2/4/8dm: All AFT T1/E1 cards with HW Echo Cancellation
- Hardware echo canceler is mandatory
AFT A500d: BRI card
- If the card is being used as a clocking source then hardware echo canceler is mandatory
- If the card is receiving the clock then the hardware echo canceler is NOT mandatory
AFT A200: Quad Port Analog FXO/FXS Card, (upto to 24 ports)
- Hardware echo canceler is optional for analog cards
AFT A400: 12 Port Analog FXO/FXS Card, (upto 24 ports)
- Hardware echo canceler is optional for analog cards
AFT B600: 5 Port Analog FXO/FXS Card (Note: Sync cable goes on jumper JP6)
- Hardware echo canceler is optional for analog cards
Please note that AFT A101/2/4/8 and A200/400 cards that were shipped before June 1st, 2007 do not support this feature and are not field upgradeable!
This feature is only supported on Maxim based T1/E1 AFT cards (AFT A101dm/A102dm/A104dm/A108dm).
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