NT5K19 Analog Tie Trunk Card 3-9
UK Trunk cards description 553-3001-173
Table 3-4
Summary of NT5K19 DC-5 signalling states
Si gna l
Out g oi ng PB X sen di ng
co ndi t io n — M W ir e
I ncomi ng PB X s end ing
co ndi t io n — M W ir e
I dl e
Ear t h-O ff
Ear t h-O ff
Sei z e
Ear t h-O n
—
Ho ld
Co nti nuat i on of s ei ze si gnal
—
Di al i ng:
Di gi t Pu ls e
DT MF
Ear t h-O ff pul s es in s tep wi t h
di al pul ses
DT MF di gi t s
—
—
Ans wer
—
Ear t h-O n
Fa r End Rel eas e
Ear t h-O ff f or l onger than 300
mi l l i s econds
—
Ne ar End Rel eas e
—
Ear t h-O ff f or l onger than
300 mi l l i sec onds
AC15 trunk operation (2280 Hz Tie trunk)
The NT5K19 Analog Tie trunk card supports the United Kingdom
AC15-A method of signalling, which is used between two PBX machines.
The system is based on a single voice frequency, 2280 Hz, method of
signalling.
In this system, four signalling wires are used: one pair for forward signals
and one pair for backward signals. The transmit pair through which signals
are transmitted is the receive pair at the far end. All signals are in the form
of either tone-on or tone-off. Table 3-5 provides a summary of signals in
both transmit and receive directions.
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