ET-400 DUoFONE Cordless Telephone System
(430-0550A)                    Specifications          Faxback Doc. # 16897

NOTE:  This Addendum contains modifications to the 43-550A.  Use it in
       conjunction with the basic Service Manual for the 43-550 DUoFONE
       ET-400.

                                   UNIT     NOMINAL     LIMIT      
PULSE DIALING

Manual Access Pause                sec.     2.0         1.8 - 2.2
Flash                              sec.     0.7         0.5 - 0.9

SIGNAL LEVEL

Duration of Signals                ms       100         90 (min.)
Inter-Digital Time                 ms       100         90 (min.)

HANDSET UNIT

Receiver

Frequency Response at 3000Hz       dB       -14.0       -14.0 +/- 6.0
Ringer Sound Level                 phon     88          78

Transmitter

Modulation sensitivity at 
  2kHz Dev.                        mV       18          5 - 36

NOTES:  Nominal specs represent the design specs; all units should be able
        to approximate these--some will exceed and some may drop slightly
        below these specs.

        Limit specs represent the absolute worst condition which might be
        considered acceptable; in no case should a unit perform to less
        than within any limit spec.

        These specifications reflect changes for the 43-550A version of the
        43-550 basic Service Manual.

        Each listing denotes a change to the basic 43-550 Service Manual
        that applies only to the 43-550A version of the manual