RD meaning in Military and Defence ?

Answer:

What is Ringdown mean?

In telephony, ringdown is a method of signaling an operator in which telephone ringing current is sent over the line to operate a lamp or cause the operation of a self-locking relay known as a drop.

Ringdown is used in manual operation, as distinguished from automatic signaling by dialing a number. The signal consists of a continuous or pulsed alternating current (AC) signal transmitted over the line. It may be used with or without a telephone switchboard. The term originated in magneto telephone signaling in which cranking the magneto generator, either integrated into the telephone set or housed in a connected ringer box, would not only ring its bell but also cause a drop to fall down at the telephone exchange switchboard, marked with the number of the line to which the magneto telephone instrument was connected.

The last ringdown telephone exchange in the United States was located at Bryant Pond, Maine, had 400+ subscribers, and converted to dial service in October 1983.

reference

Full Form	Category
River Diversion	Academic & Science
Reinforcement Distribution	Academic & Science
Rutherford	Academic & Science
Rata Die	Academic & Science
Rising Darkness	Academic & Science
Regular Decision	Academic & Science
Rage Day	Academic & Science
Reconciliation Department	Banking
Recurring Deposit	Banking
Registered Design	Business
Rating Difference	Business
Royal Dutch Petroleum Company	Business
Recemment Degorge	Business
Random Dilution	Chemistry
Rough Draft	Community
Readers Digest	Community
Reference Data	Community
Rainbow Dash	Community
Residential Development	Community
or R-D Rate Distortion	Computer and Networking
Rewind Disk	Computer Assembly Language
Register Destination	Computer Assembly Language
Register Dump	Computer Assembly Language
Remote Desktop	Computing
Remove Directory	Computing
Removable Disk	Computing
Rotate Degrees	Computing
Real Date	Computing
Requirements Development	Computing
Round Dollar	Cryptocurrency
Record Delimiter	Database Management
Relatively Divisible	General
Restricted Data	General
Risk Difference	General
Readiness Date	General
Reference Drawing	General
Raise Degree	General
Red Door	General
Rear Differential	General
Recommended Diet	General
Registered Dietitians	General
Ritual Dimension	General
Race Derived	General
Referenced Document	General
Revolving Door	General
Random Dungeon	General
Rimorchiatori Dragamine	General
Rural Depot	General
Robert Delmage	General
Radiation Dominated	General
Registered Dieititian	General
Royal Decree	General
Ram Disk	General
Raging Demon	General
A Reference Date	General
Rural District	General
Random Duration	General
Retarded Donkey	General
Republican Domination	General
Rendering Description	General
Repo Department	General
Radical Dreamers	General
Ratings Difference	General
Roster Dependant	General
Rose Diane	General
Rest and Daydreaming	General
Red Diamond	General
Regression Discontinuity	General
Rate Distortion	General
Registered Dietician	General
Relaxation Device	General
Road	General
Recreation Droid	General
Refined Decision	General
Raw Dog	General
Rijksdriehoeksmeting A Division	General
Rodadura Desplazable	General
Read Data	General
Read Devster	General
Running Dummy	General
Rural Delivery	General
Roger Dorothy	General
Reactor Description	General
Review Date	General
Relative Density	General
Reaction Diffusion	General
Remove Duplicates	General
Report Direction	General
Ranch Dog	General
Red	General
Roof Drain	General
Report Delayed	General
Really Drunk	General
Ramon Daniel	General
Resistance Divider	General
Ready Diluted	General
Regional Director	Governmental
Requirement Directive	Governmental
Rural Development	Governmental
Registration District	Governmental
Rigid Decipline	Governmental
Road Dog	Governmental
Rear Drag	Governmental
Rolling Demo	Governmental
Reserve Decoration	Governmental
Rassemblement démocrate	Governmental
Registration Dossier	Governmental
RAM DAYALU NAGR	Indian Railway Station
Real Decreto	International
Reforma Democrática	International
Registered Dietitian	Jobs
Residential Director	Jobs
Resident Director	Jobs
Recursive Doubling	Maths
Recursion Desired	Maths
Resultant Distance	Maths
Rat Dog	Medical
Respiratory Disease	Medical
Recently Disgorged	Medical
Raw Data	Medical
Regio Dragamine	Medical
Retinal Detachment	Medical
Rescued Dog	Medical
Resistant Disease	Medical
Russian Doll	Messaging
Rude Dude	Messaging
Repair Database	Military and Defence
Ringdown	Military and Defence
Replacement Detachment	Military and Defence
Results Database	Military and Defence
Rapid Deployment	Military and Defence
Rock Drill	Military and Defence
Routing Domain	Networking
Receiving Data	Networking
Remote Device	Networking
Real Drive	News & Entertainment
Rilindja Demokratike	News & Entertainment
Reservoir Dogs	News & Entertainment
Relative Dispersion	Physics Related
Republica Dominica	Regional
Regional Distributor	Regional
Radiation Detection	Space Science
Reference Designator	Space Science
Requirements Document	Space Science
Reference Document	Space Science
Racketball Deal	Sports
Racing Developed	Sports
Recreational Device	Sports
Ratings Deviation	Sports
Round Dance	Sports
Run Differential	Sports
Race Developed	Sports
Receive Delay	Telecommunication
Receive Data	Telecommunication
Ryan International Airlines	Transport & Travel
Ram Dayalu Nagar railway station	Transport & Travel