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COURIER HIGH SPEED MODEMS
-
-
Software:
Initially 19.2K or 38.4K bps, allowing the following
range of link rates:
14.4K/12K/9600/7200/ 4800/2400/1200/300/110
-
bps
Modem:
Xl or higher (rate-specific CONNECT codes) &BO
(variable DTE rate) &NO (variable link rate)
-
Example
-
Modem
DTE/DCE
Action
Response
Rate
-
1.
Power on.
19,200
2.
300-bps call comes in.
RING
19,200
CONNECT
19,200
-
3.
Data link is established.
300
Data transfer takes place.
-
4.
Data session is over.
NO CARRIER
300
Call is ended; loss of
carrier.
-
5.
2400-bps call comes in.
RING
300
CONNECT 2400
300
6.
Data link is established.
2400
-
Data transfer takes place.
7.
Data session is over.
NO CARRIER
2400
-
Call is ended; loss of
carrier.
8.
14.4K-bps call comes in.
RING
2400
-
CONNECT 14400
2400
9.
Data link is established.
19,200
-
Data transfer takes place.
10. Data session is over.
NO CARRIER
19,200
Call is ended; loss of
-
carrier.
-
-
E-14
Fax and Other Operations
-
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