Apparatus for connection to private circuits run by certain public telecommunication operators. Specification apparatus digital according CCITT Recommendation X.21 bis
€165.00
Essential requirements for connection of terminal equipment to 2-wire analogue interfaces, without capacitive termination, of public switched telecommunication networks using either the earth calling, the loop calling-disconnect clearing, the loop calling-guarded clearing or the loop calling-unguarded clearing signalling method
€374.00
Apparatus using cordless attachments (excluding cellular radio apparatus) for connection to analogue interfaces of public switched telephone networks Specification general requirements
€81.00
Specification for visual indicator lamps for use in telephone and telegraph switchboards and for allied purposes
This product is not for sale, please contact us for more information
Overhead line-wire material (non ferrous) for telegraph and telephone purposes
€269.00
Terms and definitions used in connection with telegraphs and telephones
Specification for electric lamps for railway signalling
The relation between the sone scale of loudness and the phon scale of loudness level
Visual indicator lamps
