Zhone IMACS 8000 User Manual page 679

Cannot talk to NTU while BERT is running.
You must stop the BERT test before accessing the NTU.
Cannot use the same TS on different WAN.
You cannot assign an SRU card port to the same time slot on different WAN ports.
Can't define any more IP entries.
The maximum number of IP entries has been reached.
Can't initialize modem.
The Interface card modem was not initialized.
Card ACTV;Cannot change IP,Mask,GW,Speed,Connector
PWE card error: cannot update fields with the card ACTV. Put card in STDBY first.
Card already installed.
You cannot use the Configuration option on an occupied chassis slot.
Card does not respond.
The card is not responding to your commands. Remove the card from the chassis, plug it back
in again, and repeat the command. If the message appears again, replace the card.
Card has broadcast/monitor links.
You cannot place the HSU card in standby when it has active broadcast lines.
Card is being reset
Any upgradeable card is being reset by the system. Try your command later.
Card is not available.
You cannot test the card because it is faulty. Replace the card.
Reference Guide B-5