A 2305 facility consisted of an IBM 2835 Storage Control and one or two 2305 fixed head storage modules.
The 2835 Storage Control was used with the 2305 to handle the data flow between the facility and the computer.
The 2305 could also be used with the 3330 disk storage to provide greater input/output capability and larger direct access storage capacity for systems equipped with a block multiplexer channel.
RFC 2305 - A Simple Mode of Facsimile Using Internet Mail
Network Working Group K. Toyoda Request for Comments: 2305 H. Ohno Category: Standards Track J. Murai WIDE Project D. Wing Cisco March 1998 A Simple Mode of Facsimile Using Internet Mail Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.
Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol.