Tài liệu Giáo trình tiếng anh điện tử viễn thông - digital telephone exchanges

Digital Telephone Exchanges
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4. Time slot between two samples =
5. Number of samples per second =
4. LISTENING
Listen to the following conversation about a call connect system, or PABX (Private
Automatic Branch Exchange). The conversation is between Tim Allison, a sales representative,
and John Gibbs, manager of company in the south of England.
4.1. Complete the table.
Functions Instructions
a. Internal calls i. Pick up the handset
ii .
iii Dial the four digits of the extension
b. External calls i Pick up the handset
ii .
iii Push button 2
iv .
v .
c. Transferring calls i Pick up the handset
ii Wait for the internal dial-tone
iii .
iv .
v .
d. Automatic call- back i Dial your internal correspondent
ii .
iii Push button 4