H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 1/20 (2006.01) H04L 12/26 (2006.01) H04Q 3/00 (2006.01)
Patent
CA 2047262
Abstract Message Network Monitoring Fig. 4 A switching network consists of end units between which messages flow. The end units are connected together directly (via LANs) or via common switching nodes through level O (LO) links; the nodes are connected together via level 1 (L1) links; and the nodes are grouped into areas which are connected together via level 3 (L3) links. A message entering a node has its destination area code (23, AREA) compared with the node's area (in 26), and an area/port table 28 or an end unit/port table 29 is used to look up the output port to the end unit, next node in the area, or next area. Logic circuitry 35-48 determines the incoming and outgoing levels (LO->LO, LO->L1, ... L2->L2), and the combination is logged (at 30) together with certain details of the message. Messages are thus monitored - i.e., their passage is recorded - when they cross levels in the hierarchy. Thus provided the network is "well-behaved", messages are accurately counted and categorized according to the distances which they travel through the network.
Dolan Francis
Harper John
Digital Equipment International Limited
Dolan Francis
Harper John
Smart & Biggar
LandOfFree
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