公开(公告)号：US5847660A

公开(公告)日：1998-12-08

申请号：US560557

申请日：1995-11-17

申请人： James Mason Williams ,  Jonas Butvila

发明人： James Mason Williams ,  Jonas Butvila

IPC分类号： H04H20/42 ,  H04H20/78 ,  H04H20/79 ,  H04H60/97 ,  H04J1/12 ,  H04L12/28 ,  H04M3/18 ,  H04M7/00 ,  H04N7/173 ,  H04H1/02

CPC分类号： H04H20/12 ,  H04H20/42 ,  H04J1/12 ,  H04L12/2801 ,  H04M3/18 ,  H04M7/006 ,  H04N7/17309 ,  H04H20/78 ,  H04H20/79 ,  H04H60/97

摘要： Carriers (51) in a cable telephony system (10) are prioritized (70) according to their usability. A local access manager (LAM) (27) creates a frequency list that ranks the carriers (51) based upon their frequency. When a cable fixed access unit (CFAU) (44) requests a traffic channel, the LAM (27) selects a traffic channel based on the channel's carrier usability. The LAM (27) also selects an alternative channel based on both the channel's carrier usability and the based on the number of carriers between the traffic channel and the alternate channel in the frequency list. When either the LAM (27) or the CFAU (44) determines the traffic channel is unacceptable during a call they transmit a "Switching to Alternate Channel" message. The CFAU (44) retunes to the alternate channel and transmits a "Re-Connect" request. The LAM (27) then transmits a new alternate channel and the call continues.

摘要翻译： 有线电话系统（10）中的运营商（51）根据其可用性被优先（70）。 本地接入管理器（LAM）（27）创建一个频率列表，其根据它们的频率对载波（51）进行排序。 当电缆固定接入单元（CFAU）（44）请求业务信道时，LAM（27）根据信道的载波可用性选择业务信道。 LAM（27）还基于信道的载波可用性和基于频率列表中的业务信道和备用信道之间的载波数量来选择替代信道。 当LAM（27）或CFAU（44）确定业务信道在呼叫期间不可接受时，它们发送“切换到备用信道”消息。 CFAU（44）重新连接到备用频道并发送“重新连接”请求。 然后，LAM（27）发送新的备用信道，并继续通话。