Token ring network protocol analyzer

• US 5,287,506 A
• Filed: 10/17/1991
• Issued: 02/15/1994
• Est. Priority Date: 10/17/1991
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Whiteside, Charles H.
• Primary Examiner(s): Kriess, Kevin A.
• Assistant Examiner(s): Spivak, Kevin
• Application Number:
  US07/777,987
• Time in Patent Office: 852 Days
• Field of Search: 370/16, 370/85.8, 370/60, 370/85.7, 370/85.5, 364/825, 324/533, 395/650, 395/700
• US Class Current: 714/39
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks

Abstract

A method and apparatus for inserting a computer network protocol analyzer into a Token Ring network. Commercial integrated circuits are used to initiate a standard protocol test and synchronization sequence and to actuate an insertion relay in a network coupling unit. After actuation of the insertion relay, incoming network data is switched onto outgoing network data lines, bypassing the commercial protocol circuitry. As a result, the analyzer can be inserted into a Token Ring even when there are network problems which would prohibit insertion under normal protocol.

Claims

1. A method performed by an adapter, for forcing insertion of an analyzer into a token ring network even when there are problems occurring in the network;

wherein an insertion switch, controlled by an insertion switching signal, switches incoming data from the network to the analyzer and outgoing data from the analyzer to the network;

wherein the analyzer incorporates a protocol processor which has a processor insertion output signal and a processor data output signal;

the method comprising the following steps;

(a) switching the insertion switching signal to the processor insertion output signal;

(b) inserting the analyzer into the network through the insertion switch by the processor insertion output signal;

(c) forcing the analyzer to remain inserted into the network by switching the insertion switching signal from the processor insertion output signal to a force signal; and

(d) switching the outgoing data to the network, from the processor data output signal to the incoming data from the network.

2. An adapter apparatus for forcing insertion of an analyzer into a token ring network even when there are problems occurring in the network, the adapter comprising:

an insertion switch, controlled by an insertion switching signal from the adapter, which switchably connects an incoming data signal from the network to the adapter and switchably connects an outgoing data signal from the adapter to the network, thereby inserting the adapter into the network;

a protocol processor having a processor insertion output signal and a processor data output signal;

first forcing means for switching the insertion switching signal from the processor insertion output signal to a force signal; and

second forcing means for switching the outgoing data signal to the network, from the processor data output signal to the incoming data signal from the network.