Topic
Dry loop
About: Dry loop is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 6 citations.
Papers
Patent•
20 Sep 1991TL;DR: In this article, a telephone test set that performs dry loop testing of telephone lines has a passive speech network, a speakerphone circuit, and an amplifier and a speaker coupled to the speakerphone.
Abstract: A telephone test set that performs dry loop testing of telephone lines has a passive speech network, a speakerphone circuit, and an amplifier and a speaker coupled to the speakerphone circuit. The passive speech network and the speakerphone circuit area isolated by the use of latching relays which are switched by a relay driver circuit that provides a short current burst. Line power can be used to power the speakerphone, so as to extend battery life of a battery which can augment the line power as needed.
6 citations
Patent•
18 Sep 1992TL;DR: In this paper, a telephone test set that performs dry loop testing of telephone lines has a passive speech network (38), a speakerphone circuit (50), and an amplifier (30) and a speaker (32) coupled to the speakerphone.
Abstract: A telephone test set that performs dry loop testing of telephone lines has a passive speech network (38), a speakerphone circuit (50), and an amplifier (30) and a speaker (32) coupled to the speakerphone circuit. The passive speech network and the speakerphone circuit are isolated by the use of latching relays (17) which are switched by a relay driver circuit (31) that provides a short current burst. Line power can be used to power the speakerphone, so as to extend battery life of a battery which can aug-ment the line power as needed.
Performance Metrics
| Year | Papers |
|---|---|
| 1992 | 1 |
| 1991 | 1 |