84G3 dual line functionThis function requires the G3 Option Board to be mounted. Like DualMode Communication, it is possible to concurrently communicate on twolines. For further details, please refer to Appendix E.600 dpi communicationThis function requires the optional 8 Mb memory to be installed. Wheninstalled, the fax machine can transmit/receive faxes and make copies at aresolution of 600 dpi. For further details, please refer to Appendix F.Memory ExpansionThese fax machines are fitted with a memory expansion slot located insidethe back cover of the machine. Memory expansion is available as 2, 4, or8Mbytes boards. As mentioned previously in this chapter, speed ofcommunication and the ability to handle large data files are all affected bythe machines memory capacity.