3.3 TL1 Acknowledgment

An acknowledgment is a brief TL1 output message from the NE to an OSS acknowledging the receipt of a request. It updates the user on the status of a given command. Acknowledgment should be issued if the normal response to a message will be delayed longer than two seconds.

TL1 acknowledgment can take the following format:
acknowledgment_code     ctag  terminator

An example for acknowledgment message is
OK 12345
>

where, OK - acknowledgment code, 12345 - ctag, greater than symbol > - terminator

3.3.1 Acknowledgment code

Standard TL1 acknowledgment codes are

• IP: In Progress
  
• PF: Printout follows (identical to IP)
  
• OK: All right
  
• NA: No acknowledgment
  
• NG: No Good
  
• RL: Repeat Later system busy

3.3.2 CTAG

Refers to the correlation tag of the input message to which this acknowledgment is made.

3.3.3 Terminator

TL1 acknowledgments always end with greater than symbol > terminator.