CDMA. Assume sender 1 has the code +1,+1,+1,-1,+1,-1,-1,-1, and sender 2 has the code +1,-1,+1,+1,+1,-1,+1,+1. Assume sender 1 sends 2 bits -1, +1, and sender 2 sends 2 bits -1, -1. Show the following:                    a.   (4 pts) What is the encoded data sent by sender 1 and sender 2? Fill the blank, and then show your work in the following blank. Sender 1: ___________________________________________ Sender 2:____________________________________________                      b.   (4 pts) What is the “channel output”, i.e., the data that is sent on the channel that combines both sender 1 and sender 2’s data. Fill the blank and show your                         work below.                                         Channel output:___________________________________________                        c.   (5 pts) Show that receiver 1, who has the same code as the sender 1, is able to recover the received data.            

Which the following cryptosystem is a public-key cryptosystem?

Subnet division.An institution is given the following IP address block by its ISP: 18.14.8.0/21. Divide this IP address block into smaller subnets to fit for three departments, which require 1000, 200, and 200 IP addresses. To receive full credit, you must: 1. Start from the 1000-host subnet. 2. Make sure the three subnets are continuous. 3. Show your work in “a.”, and fill the final answer. Also, consider x.x.x.0 and x.x.x.255 as valid IPs.           a.   Show your work                    b.   (4 pts) For the 1000-host department: Subnet address (x.x.x.x/x): _______________________________ Subnet mask (x.x.x.x): ___________________________________ First Host IP: ____________________________________________ Last Host IP: ____________________________________________                    c.   (4 pts) For the first 200-host department: Subnet address (x.x.x.x/x) ________________________________ Subnet mask (x.x.x.x): ___________________________________ First Host IP: ____________________________________________ Last Host IP: ____________________________________________             d.   (4 pts) For the second 200-host department: Subnet address (x.x.x.x/x): _______________________________ Subnet mask (x.x.x.x): __________________________________ First Host IP: __________________________________________ Last Host IP: ___________________________________________  

The table in the Network Layer Control Plane slide shows the calculation steps for the route to node u. Based on the same method, compute the route in the figure below for node C and fill your answer into the following table (draw the same table in your answer; a draw-table function is provided in the editing menu).   Step N’ D(A)p(A) D(B)p(B) D(D)p(D) D(E)p(E) D(F)p(F) D(G)p(G) 0             1             2             3             4             5             6             7

Write the correct form of the verb. Rafael no (querer) ir a clase. 

Consider the circuit above.  The control transformer is a 480v to 120v control transformer. When the start button is pushed the volt meter will read:

When one side of the secondary winding of a control transformer is grounded, it is referred to as a floating system.                        

All solenoids that operate on alternating current must have a(n) ________________coil.

The best place to look for specific information about a motor, such as horsepower, voltage, FLC, and full load speed is:    

Interlocking prevents some action from taking place until some other action has been performed.