| The
time-space-time (TST) switch |
|
|
|
|
|
|
|
|
| n | Works in local
exchange and subscriber stage |
||||||
| n | Performs PCM
concentration, usually 10:1 … 3:1 |
||||||
| n | Connects
subscribers also to information tones |
||||||
| and test
equipment |
|||||||
| n | Time switch
contains one bus for incoming and outgoing |
||||||
| calls
(full-duplex) |
|||||||
|
|
| Question:
Why time or |
|
| space
switch is not always enough? |
|