IBM Aptiva Series Handbook page 155

Table 13: Basic Response codes (Continued)
Digit code Word code
Connect 52000 EC*
Connect 54000 EC*
Connect 56000 EC*
Connect 16800EC*
Connect 115200EC*
Delayed
Blacklisted
Blacklist full
a. EC appears only when the Extended Result Codes configuration option (AT\V1) is enabled. EC is replaced by
one of the following symbols, depending on the error control method used:
Meaning
Connected at 52000 EC bits / s, 56K rate
Connected at 54000 EC bits / s, 56K rate
Connected at 56000 EC bits / s, 56K rate
Connected at 16800 bps
Connected at 115200 bps
Modem response codes B-13