3. A terminal concentrator consists of six2400bit/sec input lines and a single 9.600kbit/sec output line. The mean packet size is 100 bits and the arrival rate associated with each input line is 5 packets/sec. What is the mean delay experienced by a packet and what is the mean number of packets stored in the concentrator? State any assumptions made. [Hint - no trick. Just indicating that superposition applies to Poisson processes] Comment upon the result obtained when the arrival rate goes to zero. [Hint-does the delay go to 0?]