基本信息:
- 专利标题: AUTOMATIC DATA RESTORAL FOR MODEMS
- 专利标题(中):自动数据恢复模式
- 申请号:PCT/US1991000060 申请日:1991-01-03
- 公开(公告)号:WO1991010308A1 公开(公告)日:1991-07-11
- 发明人: CODEX CORPORATION , SCHROEDER, Stephen , SRIDHAR, Manickam, R.
- 申请人: CODEX CORPORATION
- 专利权人: CODEX CORPORATION
- 当前专利权人: CODEX CORPORATION
- 优先权: US460,780 19900104
- 主分类号: H04M11/00
- IPC分类号: H04M11/00
摘要:
This invention relates to the automatic restoral of data transmission by monitoring line degradation and switching to new lines (36, 38) when line quality falls below a prescribed standard. Data transmission is maintained on the leased lines (8, 10) while communication is being established on the dial lines (36, 38) so as not to disrupt data transmission. Energy is maintained on the dial lines (36, 38) at times when data is not being transmitted to prevent a change of channel on the dial lines (36, 38). A signal processor (30), associated memory (32), and analog interface circuitry (80) provide the data restoral functions. Control of the restoral procedure is handled by one modem (e.g., the calling modem (2)), and commands are sent to the other modem over either the leased lines (8, 10) or dial lines (36, 38). Communication is established across two leased lines (8, 10) and two dial lines (36, 38) in the dual line modulation mode and across one leased line (8) and one dial line (36) in the single line modulation mode.
摘要(中):
本发明涉及当线路质量低于规定标准时通过监测线路衰退和切换到新线路(36,38)来自动恢复数据传输。 当在拨号线(36,38)上建立通信时,在专线(8,10)上保持数据传输,以免中断数据传输。 在不传输数据的情况下,在拨号线(36,38)上维持能量以防止拨号线(36,38)上的频道改变。 信号处理器(30),关联存储器(32)和模拟接口电路(80)提供数据恢复功能。 一个调制解调器(例如,呼叫调制解调器(2))处理该恢复过程的控制,并且通过租用线路(8,10)或拨号线路(36,38)将命令发送到另一个调制解调器。 在双线调制模式下,通过两条租用线路(8,10)和两条拨号线路(36,38)建立通信,并且在单线路调制模式中跨越一条租用线路(8)和一条拨号线路(36)建立通信。