The Online State column reveals the state of the modem;
values include:

offline - Cable modem considered offline

offline time - the time the cable modem went offline; the format is the same as other show cable modem commands (month, day, time, and year)

init (r1) - Cable modem sent initial ranging

init (r2) - Cable modem is ranging

init (rc) - Cable modem ranging complete

init (d) - Dhcp request received

init (i) - Dhcp reply received; IP address assigned

init (o) - Option file transfer started

init (t) - TOD exchange started

online - Cable modem registered, enabled for data

online(d) - Cable modem registered, but network access for the cable modem is disabled

online(pk) - Cable modem registered, BPI enabled and KEK assigned

online(pt) - Cable modem registered, BPI enabled and TEK assigned

reject (m) - Cable modem did attempt to register; registration was refused due to bad MIC

reject (c) - Cable modem did attempt to register; registration was refused due to bad COS

reject (pk) - KEK modem key assignment rejected

reject (pt) - TEK modem key assignment rejected