GB261338A - Artificial line for use in cross-talk calibration in telephony - Google Patents
Artificial line for use in cross-talk calibration in telephonyInfo
- Publication number
- GB261338A GB261338A GB14143/26A GB1414326A GB261338A GB 261338 A GB261338 A GB 261338A GB 14143/26 A GB14143/26 A GB 14143/26A GB 1414326 A GB1414326 A GB 1414326A GB 261338 A GB261338 A GB 261338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistances
- damping
- resistance
- line
- loge
- 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
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/40—Artificial lines; Networks simulating a line of certain length
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
261,338. Felten & Guilleaume Carlswerk Akt.-Ges. Nov. 12, 1925, [Convention date]. Artificial lines.- In an artificial line for use in measuring cross - talh between two telephone lines, in accordance with principles described in Specification 189,165 and elsewhere, ohmic resistances only are employed, so that the measurements may be independent of frequency. The resistances are arranged to form a T, Fig. 1, or an H, Fig. 2, and a further resistance may be bridged across the left-hand (input) end of the line. The resistances W1, w, are adjusted so as to represent units and tenths, respectively, of the " damping," while the resistance W2 represents the impedance as measured from the right-hand (output) end. The input voltage Va (representing the disturbing transmitter .is related to the output voltage Vc(representing the disturbed receiver) approximately by the formula Va/Ve = W1/w. [1 + (W2 + W)/R] where W<1>, W2, wr are the resistances indicated in Fig. 1, R is the load resistance, and w is small compared with W1. On identifying this formula with one for a real line Va/Ve = ¢ e<b># (1 + Z/R), where Z represents the " wave resistance " and b the .. damping," it is found that Z # W2 and b = loge W1 + loge (2/w), w being neglected in the value of Z. Hence Z and b may be imitated by means of separate adjustments of W1 and W2 respectively. In the case of b, units of damping are represented by W1 and tenths by w.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE261338X | 1925-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB261338A true GB261338A (en) | 1927-03-17 |
Family
ID=5973766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14143/26A Expired GB261338A (en) | 1925-11-12 | 1926-06-04 | Artificial line for use in cross-talk calibration in telephony |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB261338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3413413A (en) * | 1963-09-23 | 1968-11-26 | Siemens Ag | Switching arrangement for the transmission of direct current telegraph signal units |
-
1926
- 1926-06-04 GB GB14143/26A patent/GB261338A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3413413A (en) * | 1963-09-23 | 1968-11-26 | Siemens Ag | Switching arrangement for the transmission of direct current telegraph signal units |
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