Title:
【発明の名称】ディジタル電子構内交換機
Document Type and Number:
Japanese Patent JP3082421
Kind Code:
B2
Abstract:
In a private branch exchange connected to an Integrated Services Digital Network, an ISDN user interface unit separates a signal from each user terminal into a B-channel packet and a D-channel packet and further separates the latter into a signaling message and a D-channel packet mode signal. The separated D-channel packet mode signal is multiplexed with D-channel packet mode signals from other user terminals into a D-channel packet mode multiplex signal and applied through a channel to an ISDN network interface unit, while the signaling message is applied to a controller for processing. In the ISDN network interface unit, the D-channel packet mode multiplex signal is multiplexed with the signaling message processed by the controller into an outgoing D-channel signal and transmitted with the B-channel packet to the ISDN.
Inventors:
Masato Fujioka
Application Number:
JP12175192A
Publication Date:
August 28, 2000
Filing Date:
May 14, 1992
Export Citation:
Assignee:
NEC
International Classes:
H04M3/00; H04M3/20; H04M11/00; H04Q3/42; H04Q3/58; H04Q5/00; H04Q11/04; (IPC1-7): H04L12/56; H04M3/00; H04M3/20; H04M11/00; H04Q3/42; H04Q3/58; H04Q5/00
Domestic Patent References:
| JP2298148A | ||||
| JP6417534A | ||||
| JP1264431A | ||||
| JP435427A | ||||
| JP4120838A | ||||
| JP4103248A | ||||
| JP250645A | ||||
| JP6290065A |
Attorney, Agent or Firm:
Umeo Yamauchi