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  TM 11-7440-232-12/NAVELEX 0967-LP-275-5010
MODIFICATION 1 TO MODEM SHELF
·Modification 1 to Modem Shelf 46880 provides wiring, a module connector, and a data carrier alarm module so that
a data carrier alarm module can be installed into an unshielded modem shelf. When the modem shelf has been modified
to accept a data carrier alarm module (as is used for the Digital Data Modem MD-701A/UY) a modification has been
made to the power supply, transmitter, and decoder error detector; and the digital receiver clock module 900-44760-01
has been replaced by digital receiver clock module 900-44760-02.
· This modification to the modules provides alarm output interconnecting wiring connections to the data carrier alarm
module.
PART OF 46880
26C DATA SET SHELF
(MODIFIED)
1-8
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