les on the hard drive of the fax server. Fax documents can vary in file size from 50k bytes to 110k bytes per page. As a rule of thumb, the average fax document is 75k bytes. Ten megabytes of drive space holds roughly one hour of voice storage. Ten megabytes of drive space holds roughly 120 pages of fax storage. A good rule of thumb for calculating storage requirements is: Each hour of storage holds 120 pages of fax. Storage methods are continually being improved upon to be more efficient. Methods of Creating and Importing Documents Faxing Documents The simplest way to send documents into the Fax Library is to fax them in from a fax machine. The disadvantage of this method is a reduction in image quality. Each time a document is faxed, the image quality deteriorates. Horizontal and verti- cal lines start to look rough (called jagging) and fine detail starts to be lost. Most documents can be faxed into Fax-on- Demand for the initial setup without a serious amount of image deterioration. It is important to start that process with a clean, sharp original. Word Processing Fax-on-Demand can also import documents from most word processors. Any word processor that can export a document in the ASCII text mode (Word, WordPerfect, etc.) can be used to generate documents for a Fax-on-Demand application. These documents are imported into the fax library by transferring them over the LAN to the fax server. The Telecom Handbook & 197 FAX SERVERS PC Fax Board The most efficient, professional way to create a Fax Library is to use a PC fax board. These are commercially available boards that fit into a slot inside a personal computer and allow that com- puter to emulate certain fax functions. Most PC fax cards can: Receive a fax. Send a fax. Convert received faxes into graphic files (which can be edited and cleaned). Convert special files (Postscript, etc.) into faxes. These boards can be used in a PC running a desktop publish- ing system to create and load professional quality documents into a Fax-on-Demand application. Fax-on-De