Broadband network systems

• US 4,675,866 A
• Filed: 04/23/1985
• Issued: 06/23/1987
• Est. Priority Date: 04/24/1984
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Takumi, Kenta, Sakamoto, Hidenori
• Primary Examiner(s): Olms, Douglas W.
• Application Number:
  US06/726,459
• Time in Patent Office: 791 Days
• Field of Search: 370/124, 370/71, 370/73, 370/75, 370/85, 340/825.5, 340/825.51
• US Class Current: 370/489
• CPC Class Codes: H04L 12/2801 Broadband local area networks
• CPC Class Codes: H04L 12/46 Interconnection of networks

Abstract

A specific channel CRF which sends back signals of a specific channel but permits bidirectional free pass of signals of the other channels is inserted at an intermediate point of a transmission path. Furthermore, a baseband network and an internetwork connecting device are connected to a broadband transmission path for effecting communication between baseband networks by utilizing the internetwork connecting device when communication distance is extended.

Claims

1. A broadband network system comprising:

a communication path having a first and a second end;

a plurality of specific network areas disposed along said communication path, each of said areas including a plurality of communication units that are adapted to transmit and receive signals and are connected in parallel to said communication path in a frequency multiplexed communication system, and each of said areas having constraints on a permissible value of propagation delay time for communications between the communication units;

an all-channel CRF connected to said first end of the communication path for receiving transmitted signals sent from the communication units, for converting the transmitted signals into forward signals and for sending the forward signals to said second end of the communication path; and

an intermediate specific channel CRF, located between each adjacent tow of the specific network areas along the communication path, for receiving all transmitted signals then on said communication path, for converting a specific transmitted signal sent from a first side of the specific channel CRF into a specific forward signal, for sending said forward signal to the communication path on said first side of the specific channel CRF, and for preventing either a specific transmitted signal from said first side of the specific channel CRF from being sent to a second other side of the specific channel CRF or a specific forward signal supplied from said second other side of the specific channel CRF from being sent to the first side of the specific channel CRF.

2. A broadband network system comprising:

a communication path having a first end and a second end, and comprising a plurality of first channels and a plurality of second channels,

a plurality of communication areas disposed along said communication path, each of said areas including a plurality of communication units that are adapted to transmit and receive signals, each of said areas having a different first communication channel, respectively, and each of said areas being adapted for communication among said communication units in said area through its corresponding first communication channel; and

a plurality of connecting devices, at least one being included in each said communication area, all said connecting devices and said communication units in an area being connected in parallel to said communication path, at least one of said connecting devices in a first area being paired with at least one connecting device in a second area, each of said pair of connecting devices being assigned different second communication channels, respectively, and each said pair of connecting devices being adapted for communication through its corresponding second communication channel.