Outdoor Telephones Type Tm-4901 | |
According to the purpose and installation place there are following types of outdoor telephones:
Telephones are intercom type. Electronic units and devices, intercom panel and other telephone elements are built in silumine housing fitted on supporting post. Entry signal telephone housing is accommodated for mounting on the signal
post. |
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Telephones in ABS and
level crossing huts - supporting plates with electronics and other elements
as well as operating panels are built in the hole (window) of huts. As circumstances
require, these telephones can be built in telephone housings fitted on supporting
posts near huts. |
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Operating panel of outdoor telephone is made of aluminum plate that provides needful mechanical robustness. On the upper section of panel are line keys and keys for dialing across lines with call separation, key for panel illumination, optical indication LED diodes, microphone and loudspeaker. The keys are metallic and therefore resistive to mechanical strain. On the lower part of panel operating manual is written. |