Nos. of Communication Variable
I believe you are talking about IAC. If yes, it will be treated as one communication variable.
Infact, IAC utilizes UDP for external communication. one communication variable corresponds to one IAC frame. One UDP message can contain one or more IAC frames. The maximum message size of UDP frame is 1400 bytes (for non-SIL). If all communication variables do not fit in one message, several requests are made.