digital transmission

1. Draw a DS1 frame and label it in detail.

2. ISDN

a. What is the data rate for a single BRI channel (which does not use bit robbing)?

b. Some home ISDN "modems" will combine two BRI channels together. What would the data rate be if you could use both channels simultaneously for data transmission?

c. What is the data rate of a single channel on a T1 connection that does not use bit robbing?

d. What is the overhead of a DS1 frame that uses bit robbing?

3. An E1 is the European version of our T1. An E1 frame has 32 channels. The first channel is channel 0. All 8 bits of channel 0 are used for framing. Channels 1 to 15 are used for data or voice and no bit robbing is used or needed. Channel 16 is used for control information on all the voice and data channels. Channels 17 to 31 are also for voice or data.

a. How many channels are overhead?

b. How many channels can be used to send data?

c. What is the overhead and the through put for an E1 frame?

d. Using the magic number, what is the total data rate used to send E1 frames?

e. What is the data rate for the users information?

f. How many framing bits are sent in one second?