Protocol for determining physical order of active stations on a

Details Protocol for determining physical order of active stations on a Protocol for determining physical order of active stations on a

1983-02-03

1985-03-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 86, 34082505, H04J 116, H04J 314, H04J 300

Patent

active

045077770

ABSTRACT:
A reconfigurable serial loop or ring communication system is provided with a method and apparatus which enables stations on the loop to ascertain the address of its nearest active upstream neighbor (NAUN). A Ring Poll Frame is generated and broadcast from an originating station. The Ring Poll Frame includes a Ring Poll command, a From Address and a reset Address Recognized (AR) control bit. The first active downstream station recognizes the command with the control bit in the reset state, copies the contents of the ring poll frame and sets the bit. The set bit inhibits subsequent downstream stations from copying the frame. The first active station then generates a substantially similar formatted ring poll frame and passes it downstream. The process is continued by downstream active stations until the originating station receives a ring poll frame having a reset control bit. The reset control bit is an indication that all stations on the loop know the address of its NAUN.
A ring management station may use the ring poll process to acquire information relative to the location of active stations on the ring.

REFERENCES:
patent: 3564145 (1971-02-01), Deutch et al.
patent: 3824545 (1974-07-01), Brenner et al.
patent: 3985962 (1976-10-01), Jones et al.
patent: 4000378 (1976-12-01), Caplan
patent: 4034351 (1977-07-01), Takezoe
patent: 4161635 (1979-07-01), Wolaver
patent: 4335426 (1982-06-01), Maxwell et al.
patent: 4410985 (1983-10-01), Yasumoto et al.

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