Power line communications analyzer

• US 5,812,557 A
• Filed: 09/04/1997
• Issued: 09/22/1998
• Est. Priority Date: 04/02/1993
• Status: Expired due to Fees

• Current Assignee: Echelon Corporation (Renesas Electronics Corporation)
• Original Assignee: Echelon Corporation (Renesas Electronics Corporation)
• Inventors: Sutterlin, Philip H., Andrus, Marie E., Hurlbut, Amy O., Tormey, Milton T., Riley, Glen M., Stewart, J. Marcus
• Primary Examiner(s): Chung, Phung M.
• Application Number:
  US08/926,586
• Time in Patent Office: 383 Days
• Field of Search: 371/20.1, 371/5.5, 371/64, 371/5.1, 371/2.1, 370/252, 370/317, 370/318, 375/254
• US Class Current: 714/712
• CPC Class Codes: G01R 31/42 AC power supplies
• CPC Class Codes: H04B 2203/5408 using protocols
• CPC Class Codes: H04B 2203/5454 Adapter and plugs
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: H04B 3/48 Testing attenuation H04B3/466 takes precedence
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: H04B 3/546 Combination of signalling, telemetering, protection circuits for remote indication of supply or distribution network condition H02J13/00

Abstract

A power line communications analyzer (PLCA) provides a signal strength metering system and selectable signal attenuation functions for adjusting the transmitting unit'"'"'s attenuation and measuring error rate without the need for a user to be present at both the sending and receiving locations under test. Each PLCA is coupled to a power line communication network via an electrical outlet and power lines. In actual operation, one of the PLCAs acts as a data transmitter and the other PLCA acts as a data receiver. The mode of operation of the PLCA can be dynamically altered during operation of the system. The PLCA comprises control logic that receives command inputs from a keypad, generates data packets for transmission on the power line communication network, receives and analyzes data packets received from the power line communication network, detects the power line signal and/or noise level and drives the LED display accordingly, and displays packet transmission information on an LCD display.

Claims

1. A communication analyzer for measuring a signal quality of a transmission signal over a communications network, said communication analyzer comprising:

control logic for measuring a signal strength of said transmission signal and a noise level present on said communications network, said control logic also for determining an operating margin between said signal strength of said transmission signal and a minimum transmit signal strength required for reliable communication on said communications network over said noise level; and

a transmitter logic for generating and transmitting data packets in said transmission signal on said communications network, said transmitter logic including logic for generating and transmitting control messages on said communications network, said control messages including a control message for dynamically selectively setting a parameter on a remote communication analyzer coupled to said communications network, said parameter including information to dynamically configure said remote communications analyzer in one of a transmit mode and a receive mode, said parameter being dynamically selectively set based on said operating margin determined by said control logic.

2. The communication analyzer as claimed in claim 1 wherein said parameter includes information to configure an attenuation level of said transmission signal.

3. The communication analyzer as claimed in claim 1 wherein said communications network is a power distribution network.

4. The communication analyzer as claimed in claim 3 wherein said parameter includes information to configure an attenuation level of said transmission signal.

5. A system for adjusting communication quality on a communications network, said system comprising:

control logic for measuring a signal strength of a communication signal and a noise level present on said communications network, said control logic also for determining an operating margin between said signal strength of said transmission signal and said noise level; and

transmitter logic for transferring information to another system coupled to said communications network, said information including information to dynamically configure said another system in one of a transmit mode and a receive mode, said information to dynamically configure said another system being dynamically selectively set based on said operating margin determined by said control logic.

6. The system as claimed in claim 5 wherein said communications network is a power distribution network.

7. The system as claimed in claim 6 wherein said information includes information to configure an attenuation level of said communication signal.