Communications system

Details Communications system Communications system

2006-11-21

2006-11-21

Pham, Chi (Department: 2616)

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

C370S351000, C370S503000, C370S509000, C370S510000, C370S507000

Reexamination Certificate

active

07139264

ABSTRACT:
In a synchronous digital communications system a network of SDH (or SONET) equipments (SE) are arranged to exchange synchronisation signals via ports on the SEs, each port being allocated a source identifier (SID). These SIDs are used to identify the source of each synchronisation signal input at a particular SE. When the SE selects a synchronisation signal to transmit out of its ports, the SID associated with that selected signal is compared with SID of each port. If a match is found the synchronisation status message (SSM) associated with the synchronisation signal sent out at that port is set to “Do Not Use” (DNU) to warn the destination SE that the synchronisation signal has been looped back. Each SE is allocated a unique equipment identifier. The SID of each port is set to the unique SE identifier of SE to which it is directly connected.

REFERENCES:
patent: 5886996 (1999-03-01), Wolf
patent: 6185216 (2001-02-01), Chapman
patent: 6560245 (2003-05-01), Slater
patent: 6567422 (2003-05-01), Takeguchi et al.
patent: 2 301 991 (1996-12-01), None
patent: WO 96/39760 (1996-12-01), None

Affiliated with

Also associated with

Rating

Communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communications system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3646215