Circuit termination method and a circuit terminating apparatus

• US 7,177,327 B2
• Filed: 03/05/2002
• Issued: 02/13/2007
• Est. Priority Date: 10/14/1999
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Murata, Shigeru
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): LY, ANH VU H
• Application Number:
  US10/092,963
• Publication Number:
  US 20020122477A1
• Time in Patent Office: 1,806 Days
• Field of Search: None
• US Class Current: 370/503
• CPC Class Codes: H04J 3/0602 Systems characterised by the synchronising information used
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

The present invention relates to a circuit termination method and a circuit terminating apparatus that are used for metallic circuits that offer high-speed communication. When a transmission speed is required to be changed due to a change in conditions of a circuit and the like through an opposite circuit terminating apparatus, a service suspension and resumption of a predetermined bit position common to each frame of multi frames, and a service suspension and resumption of a continuous bit string of a predetermined bit length starting from a predetermined bit position of a predetermined frame of the multi frames are performed, and an inputting speed and an outputting speed of a terminal connected to the circuit terminating apparatus is adjusted to be consistent with a transmission speed between the circuit terminating apparatus and a second circuit terminating apparatus.

Claims

1. A circuit termination method comprising:

updating a transmission speed according to a condition of a circuit between a first circuit terminating apparatus and a second circuit terminating apparatus,

performing a service suspension and resumption of a predetermined bit position common to each frame of a multi frame,

adjusting inputting speed and outputting speed of a terminal connected to the first circuit terminating apparatus to the updated transmission speed between the first circuit terminating apparatus and the second circuit terminating apparatus, and

a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

9. The circuit termination method as claimed in claim 1, wherein a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when the first circuit terminating apparatus detects a specific pattern transmitted from the terminal connected to the first circuit terminating apparatus.

10. The circuit termination method as claimed in claim 1, wherein a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period.

2. A circuit termination method comprising:

updating a transmission speed according to a condition of a circuit between a first circuit terminating apparatus and a second circuit terminating apparatus,

performing a service suspension and resumption of a continuous bit string of a predetermined length starting from a predetermined bit position of a predetermined frame of a multi frame,

adjusting an inputting speed and an outputting speed of a terminal connected to the first circuit terminating apparatus to the updated transmission speed between the first circuit terminating apparatus and the second circuit terminating apparatus, and

a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

3. A circuit termination method comprising:

checking whether a synchronous speed established by a first circuit terminating apparatus and a second circuit terminating apparatus at an operation start is faster or slower than a contracted speed of a terminal connected to the first circuit terminating apparatus,

performing a service suspension and resumption of a predetermined bit position common to each frame of a multi frame to update the synchronous speed, if the established synchronous speed is slower than the contracted speed,

adjusting an inputting speed and an outputting speed of the terminal to the updated speed between the first circuit terminating apparatus and the second circuit terminating apparatus, and

a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

4. A circuit termination method comprising:

checking whether a synchronous speed established by a first circuit terminating apparatus and a second circuit terminating apparatus at an operation start is faster or slower than a contracted speed of a terminal connected to the first circuit terminating apparatus,

performing a service suspension and resumption of a continuous bit string of a predetermined length starting from a predetermined bit position of a predetermined frame of a multi frame to update the synchronous speed, if the established synchronous speed is slower than the contracted speed,

adjusting an inputting speed and an outputting speed of the terminal to the updated speed between the first circuit terminating apparatus and the second circuit terminating apparatus, and

a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

5. A circuit terminating apparatus comprising:

a service control unit which generates a clock pulse, and performs a service suspension according to user conditions and circuit conditions, said service control unit performing a service suspension and resumption of a predetermined bit position common to each frame of a multi frame when a transmission speed needs to be updated due to a change in circuit conditions between a first circuit terminating apparatus and a second circuit terminating apparatus, adjusting an inputting speed and an outputting speed of a terminal connected to the first circuit terminating apparatus to the updated transmission speed between the first circuit terminating apparatus and the second circuit terminating apparatus, and a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

11. The circuit terminating apparatus as claimed in claim 5, comprising a specific pattern detecting unit which detects a specific pattern, thereby when the first circuit terminating apparatus detects the specific pattern that the terminal connected to the first circuit terminating apparatus transmits, the first circuit terminating apparatus establishes synchronization again with the second circuit terminating apparatus starting from a transmission speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus.

12. The circuit terminating apparatus as claimed in claim 5, comprising a synchronization monitoring unit that monitors a synchronization status, thereby when the synchronization is lost for a period longer than a predetermined period, the first circuit terminating apparatus establishes synchronization again with the second circuit terminating apparatus starting from a transmission speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus.

13. The circuit terminating apparatus as claimed in claim 5, comprising a synchronization monitoring unit that monitors a synchronization status, thereby when the synchronization is lost for a period longer than a predetermined period and when afterwards synchronization is re-established and maintained for a period longer than a predetermined period, the first circuit terminating apparatus establishes synchronization again with the second circuit terminating apparatus starting from a transmission speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus.

6. A circuit terminating apparatus comprising:

a service control unit which generates a clock pulse, and performs a service suspension according to user conditions and circuit conditions, said service control unit performing a service suspension and resumption of a continuous bit string with a predetermined bit length starting from a predetermined bit position of a predetermined frame of a multi frame when a transmission speed needs to be updated due to a change in circuit conditions between a first circuit terminating apparatus and a second circuit terminating apparatus, adjusting an inputting speed and an outputting speed of a terminal connected to the first circuit terminating apparatus to the updated transmission speed between the first circuit terminating apparatus and the second circuit terminating apparatus and a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

7. A circuit terminating apparatus comprising:

a service control unit which generates a clock pulse, and performs a service suspension according to user conditions and circuit conditions, said service control unit checking whether a synchronous speed established between a first circuit terminating apparatus and a second circuit terminating apparatus at starting operation is faster than a contracted speed of a terminal connected to the first circuit terminating apparatus, performing a service suspension and resumption of a predetermined bit position common to each frame of a multi frame to update the synchronous speed, if the established synchronous speed is below the contracted speed, adjusting an inputting speed and an outputting speed of the terminal to the updated speed established between the first circuit terminating apparatus and the second circuit terminating apparatus, and a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.

8. A circuit terminating apparatus comprising:

a service control unit which generates a clock pulse, and performs a service suspension according to user conditions and circuit conditions, said service control unit checking whether a synchronous speed established by a first circuit terminating apparatus and a second circuit terminating apparatus at starting operation is faster than a contracted speed of a terminal connected to the first circuit terminating apparatus, performing a service suspension and resumption of a continuous bit string of a predetermined bit length starting from a predetermined bit position of a predetermined frame of a multi frame to update the synchronous speed, if the established synchronous speed is below the contracted speed, adjusting an inputting speed and an outputting speed of the terminal to the updated speed established between the first circuit terminating apparatus and the second circuit terminating apparatus, and a re-negotiation is performed between the first circuit terminating apparatus and the second circuit terminating apparatus starting from a speed faster than a contracted speed of the terminal connected to the first circuit terminating apparatus when frame synchronization between the first circuit terminating apparatus and the second circuit terminating apparatus monitored is lost for a period longer than a predetermined period, and the synchronization is established again for a period longer than a predetermined period.