GB2111348B - V.f. receivers for use in digital switching systems - Google Patents
V.f. receivers for use in digital switching systemsInfo
- Publication number
- GB2111348B GB2111348B GB08134147A GB8134147A GB2111348B GB 2111348 B GB2111348 B GB 2111348B GB 08134147 A GB08134147 A GB 08134147A GB 8134147 A GB8134147 A GB 8134147A GB 2111348 B GB2111348 B GB 2111348B
- Authority
- GB
- United Kingdom
- Prior art keywords
- receivers
- switching systems
- digital switching
- digital
- systems
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal
- H04Q1/4485—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal which is transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Time-Division Multiplex Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08134147A GB2111348B (en) | 1981-11-12 | 1981-11-12 | V.f. receivers for use in digital switching systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08134147A GB2111348B (en) | 1981-11-12 | 1981-11-12 | V.f. receivers for use in digital switching systems |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2111348A GB2111348A (en) | 1983-06-29 |
GB2111348B true GB2111348B (en) | 1985-06-12 |
Family
ID=10525828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08134147A Expired GB2111348B (en) | 1981-11-12 | 1981-11-12 | V.f. receivers for use in digital switching systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2111348B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4519072A (en) * | 1982-11-10 | 1985-05-21 | Rockwell International Corporation | Answer supervision system |
JPS62204652A (en) * | 1986-03-04 | 1987-09-09 | Nec Corp | Audible frequency signal identification system |
KR100258150B1 (en) * | 1997-05-29 | 2000-06-01 | 윤종용 | Method and circuit for channel assign trunk line test in rf communication system |
-
1981
- 1981-11-12 GB GB08134147A patent/GB2111348B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2111348A (en) | 1983-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |