The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 1994
Filed:
Jul. 17, 1992
Andrew W Jackson, Austin, TX (US);
Long V Nguyen, Austin, TX (US);
Rolm Company, Santa Clara, CA (US);
Abstract
A method and apparatus for transferring data between telephony communications lines having different frame transmission rates. A downlink data frame according to a first protocol (e.g. a ROLMlink frame) is transmitted, at a first data rate, from a private branch exchange (PBX) to a telephone's network interface. One or more fields of data from this frame are collected in shift register which is internal to the interface. After collection, the data is injected into a downlink data frame of the telephone's internal protocol (e.g. a GCI frame), which is being transmitted on the telephone side of the interface at a second data rate (different from the first data rate). Simultaneously with the injecting, one or more fields of data from an uplink data frame of the telephone's internal protocol are shifted into the same register for later injection into an uplink data frame, of the external protocol, destined for the PBX. This later injection occurs simultaneously with data from another downlink data frame, from the PBX side of the interface, being collected in the register.