Optional Equipment Installation
110
025-9416
q
6.
If an extender card was used, remove it and reinstall the trunk card.
If a second trunk card was removed for the adjustment procedure, reinstall it.
q
7.
Replace the top cover of the paging terminal and secure it with screws.
DUAL MULTI-FREQUENCY (MF) DECODER
The multi frequency decoder option (Part No. 702-9197) allows the terminal to accept MF digit
feed from direct inward dial (DID) trunks or E&M 2- or 4-wire trunks emulating DID.
Note:
MF is not the same as DTMF (touch-tone
) signaling. The multifrequency option will
not decode DTMF feed digits.
MF is a dual-tone signaling method similar to the common touch-tone DTMF (dual tone multi
frequency) protocol. Both formats use two combined tones. MF tones, however, are different
frequencies from DTMF tones. Also, the MF protocol involves rigid timing constraints and
framing characters, so that
a DID line with four feed digits actually sends six characters which
can NOT decode properly as DTMF
.
MF service can be indirectly tested with most RF service monitors, using their DTMF decoders
AC coupled to the telco pair. If MF feed digit service decodes properly as DTMF characters with
no framing digits, then contact the telco service provider to correct the situation. If feed digits
plus two extra characters are observed and do not properly decode as DTMF and if the tone
bursts are not clipped, the MF digits are probably acceptable. The telco technician should have
an MF decoder to verify feed digits if necessary.
The MF option board (Part No. 702-9297) installs onto the dual trunk board to decode these
tones. Essentially, it provides a specialized tone decoder chip for each half of the dual trunk.
JP1 is used only for production testing of MF tone generation. Table 13 shows tone pairs for MF
and DTMF protocols to illustrate the differences.
Table 13. MF and DTMF Tone Pair Comparison
MF Format
Tone Pair Frequencies
Coded Digit
Name
MF Format Tones
DTMF Format Tones
1
1
700, 900
697, 1209
2
2
700, 1100
697, 1336
3
3
900, 1100
697, 1477
4
4
700, 1300
770, 1209
5
5
900, 1300
770, 1336
6
6
1100, 1300
770, 1477
7
7
700, 1500
852, 1209
8
8
900, 1500
852, 1336
9
9
1100, 1500
852, 1477
Summary of Contents for 640 DAPT XTRA
Page 2: ......
Page 6: ...Statements vi 025 9416...
Page 20: ...Introduction 8 025 9416...
Page 26: ...Specifications 14 025 9416...
Page 96: ...Installation 84 025 9416...
Page 126: ...Optional Equipment Installation 114 025 9416...
Page 134: ...Voice Prompts 122 025 9416...
Page 174: ...Parts Lists and Schematics 162 025 9416 Schematic...
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Page 198: ...Parts Lists and Schematics 186 025 9416 RAM Disk 702 9386B ROM Disk 702 9389B...
Page 199: ...Parts Lists and Schematics 025 9416 187 TNPP Interface 702 9362C 2...
Page 200: ...Parts Lists and Schematics 188 025 9416 Terminal Block Adapter 702 9470B...
Page 201: ...Parts Lists and Schematics 025 9416 189 CONFIGURATION DIAGRAMS Dual Trunk Telco DID 024 0076A...
Page 202: ...Parts Lists and Schematics 190 025 9416 Dual Trunk Telco End to End 024 0077A...
Page 203: ...Parts Lists and Schematics 025 9416 191 Dual Trunk Telco E M 024 0078A...
Page 204: ...Parts Lists and Schematics 192 025 9416 Dual Trunk Telco Ground Start 024 0079A...
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