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61202011L1-1
DSU III AR User Manual
E-1
Appendix E
DSU to DSU Tail Circuit
MODEM TAIL CIRCUIT APPLICATION
A DDS Tail Circuit is a serial connection of two DDS circuits as
shown in Figure E-1 on page E-2. The two circuits are joined at the
DTE port interface of each DSU unit. A special tail circuit crossover
cable is required so that transmit line connects to the receive line on
the other DSU as well as the DTR, CTS, RTS, and CD signal lines
get matched appropriately. Figure E-2 on page E-3 details the
crossover cable wiring.
ADTRAN DSU/CSU units will operate in this configuration.
ADTRAN does not recommend the tail circuit mode due to the potential
for clock slippage and data loss when using this configuration. Moreover,
further problems can occur when each DDS circuit is using a different
master clock source and will require additional hardware called a tail cir-
cuit buffer to reduce the risk of data overruns and clock slips.
Summary of Contents for 1202011L1
Page 1: ...DSU III AR Data Service Unit User Manual Part Number 1202011L1 61202011L1 1C May 2001...
Page 18: ...Table of Contents xviii DSU III AR User Manual 61202011L1 1...
Page 24: ...List of Tables xxiv DSU III AR User Manual 61202011L1 1...
Page 72: ...Chapter 6 Configuring DTE Options 6 18 DSU III AR User Manual 61202011L1 1...
Page 82: ...Chapter 9 Manual Command 9 4 DSU III AR User Manual 61202011L1 1...
Page 110: ...Chapter 11 Testing and Troubleshooting 11 26 DSU III AR User Manual 61202011L1 1...
Page 130: ...Appendix B AT Commands B 12 DSU III AR User Manual 61202011L1 1...
Page 134: ...Appendix C Default Configuration Profiles C 4 DSU III AR User Manual 61202011L1 1...
Page 136: ...Appendix D EIA 232 Connector D 2 DSU III AR User Manual 61202011L1 1...
Page 140: ...Appendix E DSU to DSU Tail Circuit E 4 DSU III AR User Manual 61202011L1 1...
Page 144: ...Appendix F Specifications Summary F 4 DSU III AR User Manual 61202011L1 1...
Page 158: ...Appendix H Glossary H 10 DSU IV ESP User Manual 61204011L1 1...