EXECUTIVE SUMMARY .................................................................................................................................. 3
MODEM PERFORMANCE ............................................................................................................................... 3
CONNECT SPEED .................................................................................................................................................. 3
BANDWIDTH AND ATTENUATION......................................................................................................................... 4
NETWORK MODELING.......................................................................................................................................... 4
SNR..................................................................................................................................................................... 5
ERROR CORRECTION............................................................................................................................................ 6
NETWORK TOPOLOGY.................................................................................................................................. 6
CENTRAL OFFICE ................................................................................................................................................. 7
COPPER LOOP ...................................................................................................................................................... 7
PREMISES WIRING................................................................................................................................................ 7
INTER-OFFICE TRUNKING .................................................................................................................................... 8
LONG DISTANCE AND 1-800 NUMBERS ................................................................................................................ 8
PBX SYSTEMS..................................................................................................................................................... 8
ANALOG IMPAIRMENTS ................................................................................................................................ 8
NOISE................................................................................................................................................................... 8
SIGNAL LEVEL ..................................................................................................................................................... 8
ECHO ................................................................................................................................................................... 9
DELAYS ............................................................................................................................................................... 9
DIGITAL IMPAIRMENTS................................................................................................................................. 9
PADS AND ATTENUATION .................................................................................................................................... 9
ADPCM.............................................................................................................................................................. 9
ROBBED-BIT SIGNALING...................................................................................................................................... 9
PCM (56K) DEPENDENCIES AND PERFORMANCE................................................................................ 10
NETWORK TOPOLOGY FOR 56K ......................................................................................................................... 10
REQUIREMENTS ................................................................................................................................................. 10
CONNECT SPEED EXPLAINED ............................................................................................................................. 11
COMPAQ MODEM TESTING........................................................................................................................ 11
PERFORMANCE TESTING..................................................................................................................................... 11
INTEROPERABILITY ............................................................................................................................................ 12
MISCELLANEOUS ............................................................................................................................................... 12
GLOSSARY ........................................................................................................................................................ 12
REVISED 7/20/98
2
DOC. NUM. PRT/005A/0798

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