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DEPRESS
STEP
SWITCH
DIGIT 2 SHOWS
ON VISUAL
DISPLAY
LINK 1
LAMP ON
AUDIBLE RING-
BACK HEARD.
( NOTE )
LINK 2
LAMP ON
AUDIBLE
RING BACK
HEARD .
IS SYSTEM
EQUIPPED WITH
TWO 4B7A KTUs
NO
BSP S18-411·100 -i01 1978-08-47. jpg
IF 1 IS DISPLAYED
DEPRESS SWITCH
NO
AGAIN . IF 1 STILL
DISPLAYED, START
FROM PREPARATION.
NO
SEE
TEST
1
REPLACE
NO
485A OR
48SA KTU
NO
SEE
TEST
1
REPLACE
NO
4B5A OR
4BSA KTU
YES
Fig. 2 1 -Test 2 Sequence-Audible Ringback
Scanned by Frank Harrell, (Cowbo
LINK 3
LAMP ON
AUDIBLE
RINGBACK
HEARD.
LINK 4
LAMP ON
AUDIBLE
RINGBACK
HEARD .
Frank) Castle Rock, Colorado Oct 1S, 2012 2 1 :1 2 : 1 1
ISS 1 , SECTION 5 1 8-4 1 1 - 1 00
NO
SEE
TEST
YES
REPLACE
NO
485A OR
48SA KTU
NO
SEE
TEST
YES
REPLACE
NO
485A OR
4BSA KTU
YES
NOTE : IF SYSTEM IS EQUIPPED
WITH SINGLE SPURT AUDIBLE
RINGBACK OPTION , THE AUDIBLE
RINGBACK TONE WILL BE
CONTINUOUS FOR THE TEST .
END OF
TEST 2
1
1
Page 47
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