System and method for detecting routing problems

• US 20080052566A1
• Filed: 06/21/2007
• Published: 02/28/2008
• Est. Priority Date: 06/24/2006
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Cashman, Paul, Moore, Roderick
• Application Number:
  US11/766,572
• Publication Number:
  US 20080052566A1
• Time in Patent Office: Days
• US Class Current: 714/716
• CPC Class Codes: H04L 41/0681 Configuration of triggering conditions
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A system includes an adapter and a string of switches having a head-of-string switch and a tail-of-string switch. The adapter is connected to the head-of-string switch. Each switch in the string is connected to an adjacent switch. The system further includes one or more devices connected to each respective switch. The system is arranged to periodically transmit a first signal from a first device connected to an end-of-string switch. The first signal passes through all of the switches in the string to a second device connected to the opposite end-of-string switch. A second signal is transmitted from the second device to the first device. In this way, routing problems in the switches can be detected. The first device is arranged to generate an error message, following a predefined period after transmitting the first signal, if the second signal is not received at the first device.

Claims

1. A system comprising:

an adapter;

a string of switches comprising a head-of-string switch and a tail-of-string switch, the adapter connected to the head-of-string switch, each switch in the string connected to an adjacent switch; and

,

one or more devices connected to each respective switch,

wherein the system is arranged to periodically transmit a first signal from a first device connected to an end-of-string switch, the first signal passing through all of the switches in the string to a second device connected to the opposite end-of-string switch and to transmit a second signal from the second device to the first device.

2. The system of claim 1, wherein the first device is connected to the tail-of-string switch and the second device is the adapter.

3. The system of claim 1, wherein the first device is the adapter and the second device is connected to the tail-of-string switch.

4. The system of claim 1, wherein the first device is arranged to generate an error message, following a predefined period after transmitting the first signal, if the second signal is not received at the first device.

5. The system of claim 1, further comprising a second adapter, wherein the system is further arranged to transmit a third signal, the third signal passing through all of the switches in the string, and to transmit a fourth signal back to the originator of the third signal, the second adapter being the originator of the third signal or the recipient of the third signal.

6. The system of claim 1, wherein the second signal comprises an acknowledgement of the first signal.

7. The system of claim 1, further comprising one or more switches in-between the head-of-string switch and the tail-of-string switch of the string of switches.

8. A method for operating a system, the system comprising an adapter, a string of switches comprising a head-of-string switch and a tail-of-string switch, the adapter connected to the head-of-string switch, each switch in the string connected to an adjacent switch, and one or more devices connected to each respective switch, the method comprising:

periodically transmitting a first signal from a first device connected to an end-of-string switch, the first signal passing through all of the switches in the string to a second device connected to the opposite end-of-string switch; and

,

transmitting a second signal from the second device to the first device.

9. The method of claim 8, wherein the first device is connected to the tail-of-string switch and the second device is the adapter.

10. The method of claim 8, wherein the first device is the adapter and the second device is connected to the tail-of-string switch.

11. The method of claim 8, further comprising generating an error message at the first device, following a predefined period after transmitting the first signal, if the second signal is not received at the first device.

12. The method of claim 8, wherein the system further comprises a second adapter, and wherein the method further comprises transmitting a third signal, the third signal passing through all of the switches in the string, and transmitting a fourth signal back to the originator of the third signal, the second adapter being the originator of the third signal or the recipient of the third signal.

13. The method of claim 8, wherein the second signal comprises an acknowledgement of the first signal.

14. The method of claim 8, wherein the system further comprises one or more switches in-between the head-of-string switch and the tail-of-string switch of the string of switches.

15. A computer-readable medium having one or more computer programs to perform a method for operating a system, the system comprising an adapter, a string of switches comprising a head-of-string switch and a tail-of-string switch, the adapter connected to the head-of-string switch, each switch in the string connected to an adjacent switch, and one or more devices connected to each respective switch, the method comprising:

periodically transmitting a first signal from a first device connected to an end-of-string switch, the first signal passing through all of the switches in the string to a second device connected to the opposite end-of-string switch; and

,

transmitting a second signal from the second device to the first device.

16. The computer-readable medium of claim 15, wherein the first device is connected to the tail-of-string switch and the second device is the adapter.

17. The computer-readable medium of claim 15, wherein the first device is the adapter and the second device is connected to the tail-of-string switch.

18. The computer-readable medium of claim 15, further comprising generating an error message at the first device, following a predefined period after transmitting the first signal, if the second signal is not received at the first device.

19. The computer-readable medium of claim 15, wherein the system further comprises a second adapter, and wherein the method further comprises transmitting a third signal, the third signal passing through all of the switches in the string, and transmitting a fourth signal back to the originator of the third signal, the second adapter being the originator of the third signal or the recipient of the third signal.

20. The computer-readable medium of claim 15, wherein the system further comprises one or more switches in-between the head-of-string switch and the tail-of-string switch of the string of switches.