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Hardware Overview
26
025-9416
Table 4.
Table 4. E&M Trunk Configurations
# of
Leads
Immediate
Start
Wink
Start
Lead
Supervision
Hybridized
Full-Duplex
Dual Trunk Interface in
E&M Configuration
2
ü
ü
ü
ü
Dual Trunk 4-Wire Audio
Interface Configuration
4
ü
ü
ü
For a simplified configuration schematic of the E&M signaling, see “Configuration Diagrams” in
Section 11.
E&M Immediate Start
Telco, PABX, or RF/
µ
wave link equipment initiate inbound calling to the Model 640 through M-
lead signaling. When -48 V
DC
(-24 V
DC
OK) is applied to the M-lead, the loop detect line goes
low initiating pulse, DTMF, or MF detection as programmed. The dialup equipment transmits the
feed digits to the Model 640. After the dialed digits have been decoded, the E-lead is grounded,
conversation mode begins, and the calling party is prompted for their page entry.
The call is terminated when the telco equipment drops the M-lead voltage, or when the Model
640 opens the E-lead.
E&M Wink Start
Telco, PABX, or RF/
µ
wave link equipment initiate inbound calling to the Model 640 through
M-lead signaling. When -48 V
DC
(-24 V
DC
OK) is applied to the M-lead, the loop detect line goes
low. The Model 640 “winks” to the dialup equipment by flashing the E-lead to ground for
approximately 240 mS. After the wink has been recognized, the dialup equipment transmits the
feed digits to the Model 640. After the dialed digits have been decoded, the E-lead is grounded,
conversation mode begins, and the calling party is prompted for their page entry.
The call is terminated when the telco equipment drops the M-lead voltage, or when the Model
640 opens the E-lead.
Note:
-5 V
DC
or -12 V
DC
M-lead detection can be obtained by removing R6 (Trunk A) or R9
(Trunk B) from the Dual Trunk 4-Wire Audio Interface board (Part No. 702-9488).
DUAL TRUNK 4-WIRE AUDIO INTERFACE BOARD
The dual trunk 4-wire audio interface card (Part No. 702-9488) is essentially a dual trunk
interface board with the telco
hybrid
circuitry removed to provide separate TO TEL and FROM
TEL audio paths with no sidetone. The board is loaded with a dual matrix card (Part No. 702-
9122) for each trunk in order to provide E-lead signaling. These
must
be configured for E&M
operation as described on page 22.
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...
Page 175: ...Parts Lists and Schematics 025 9416 163...
Page 176: ...Parts Lists and Schematics 164 025 9416...
Page 177: ...Parts Lists and Schematics 025 9416 165...
Page 178: ...Parts Lists and Schematics 166 025 9416...
Page 179: ...Parts Lists and Schematics 025 9416 167...
Page 180: ...Parts Lists and Schematics 168 025 9416...
Page 181: ...Parts Lists and Schematics 025 9416 169...
Page 182: ...Parts Lists and Schematics 170 025 9416 Silkscreen...
Page 185: ...Parts Lists and Schematics 025 9416 173 Schematic...
Page 186: ...Parts Lists and Schematics 174 025 9416...
Page 187: ...Parts Lists and Schematics 025 9416 175...
Page 188: ...Parts Lists and Schematics 176 025 9416...
Page 189: ...Parts Lists and Schematics 025 9416 177...
Page 190: ...Parts Lists and Schematics 178 025 9416 Silkscreen...
Page 193: ...Parts Lists and Schematics 025 9416 181 Schematic...
Page 194: ...Parts Lists and Schematics 182 025 9416...
Page 195: ...Parts Lists and Schematics 025 9416 183...
Page 196: ...Parts Lists and Schematics 184 025 9416 Silkscreen...
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...
Page 210: ...025 9416...