04951309 is referenced by 38 patents and cites 10 patents.

A modem capable of three modes of operation; a normal mode, a reduced power mode responsive to a control signal from a function controller within the modem, and a further reduced power mode responsive to a control signal from the computer. The function controller monitors activity within the modem and applies or removes power transparently as required to exit or enter the first reduced power mode. The control signal from the computer enables the modem to enter or exit the further reduced power mode, in which no modem functions are available.

Title
Power-down modem
Application Number
7/257953
Publication Number
4951309
Application Date
October 14, 1988
Publication Date
August 21, 1990
Inventor
Lee F McCrocklin
Carrollton
TX, US
Said S Saadeh
Plano
TX, US
Allen E Gross
Carrollton
TX, US
Agent
Arnold White & Durkee
Assignee
Compag Computer Corporation
TX, US
IPC
H04M 11/00
View Original Source