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|  MIL-I-24078(SHIPS)
3.21 Signal indicator lamps. - The release indicator Lamp shall be located directly over the release
switch. The call and bus y indicator lamp shall be individually located over the station selector switches.
Signal indicator lamps shall be subminiature, omnidirectional, red plastic dome using a type T-1-3/4
lamp.
3.22 Station identification. - This shall be a durable, abrasive-resistant laminated plastic strip
suitable for engraving. The laminations shall be opaque black and translucent white. Guide lines shall -
be engraved on the marker to indicate the limits of the area to be engraved with the station designation.
The engraved area shall be at a sufficient depth to expose the translucent white lamination. The marker
shall be a single strip removable from the f rent of the equipment.
3.23 Rectifiers. - Silicon type rectifiers shall be used to supply high voltage for the amplifier. Suit-
able resistance shall be inserted in the high voltage circuit as a surge current limiter. Rectifiers' shall
be selected from approved types listed in MIL-STD-200.
3.24 Operational features. - The operational features of the system shall be as specified in 3.24.1
through 3.24.7. Equipment furnished under this specification shall be designed to operate in a system
which may include type LS-385/SIC or LS-386/SIC intercommunication stations manufactured in accordance
with MIL-I-17928 or type LS-458/SIC intercommunication stations (hands-free operated reply reproducer)
manufactured in accordance with MIL-I-22560. The schematic diagram for the LS-458/SIC intercommuni-
cation station is shown on figure 1 of this specification. Master stations referred to may be type LS-385/SIC,
LS-386/SIC, or the type of intercommunication station to be furnished under this specification. Intercom-
munication stations furnished under this specification shall be electrically compatible with types LS-385/SIC,
LS-386/SIC and LS-458/SIC such that any of the three types can be replaced by a unit furnished under this
specification.
3.24.1 Communication between two master stations. -
3.24. 1.1 Normal operation to call. - Press station selector switch. If station selected is not busy
(indicated by busy lamp) operate press-to-talk switch and talk into speaker.
3.24. 1.2 Normal operation to answer a call. - Operate press-to-talk switch and talk into speaker.
3.24. 1.3 Operation when calling a busy station. - When a station has received a busy indication, it
shall not be possible to hear speech from the busy station.
3.24. 1.3.1 Busy override feature. - All units shall be provided with a busy override feature. By
removal of jumper connections at ships terminal boards at each station, it shall be possibIe to rearrange
the busy circuit so that a station receiving a busy indication can hear the communication of the busy station
and talk to the busy station. Under this condition the station calling the bus y station may superimpose
speech signals on those of the busy station.
3.24. 1.3.2 Operation with busy override. - If busy indication is received (see 3.24.1. 1) operate the
press-to-talk switch. This will cause the busy light to go out and speech from the busy station or station
to whom the busy station is talking to be heard. To talk to the busy station, operate the press-to-talk
switch and speak into the loudspeaker.
3.24.2 Parallel operation of two master stations. - When two units are connected for parallel operation
they shall be the same as for normal single operation with the following exceptions:
(a) Incoming speech will be heard at both units.
(b) Either station may answer a call but not both. (Inadvertent answering by both units
simultaneously will not cut off transmission of speech to the calling unit. )
(c) Operation of volume control from either unit will control volume of both units.
(d) Outgoing speech from one paralleled unit will not be heard at the unit to which it is paralleled.
(e) Operation of a station selector at either of the paralleled units in addition to lighting the
call light at the called station will cause the call light in the unit to which it is paralleled
to light.
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