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Country-Specific Information C-23
Country-Specific
Information
4-Wire Leased Line Interface (Models 3263/3268)
4-wire leased line connections are made via the 2W/4W LEASE interface.
Table C-11 describes 4-wire leased line interface pinouts.
Delayed and Forbidden Lists
When operating in certain countries, the modem processes call attempt failures as
delayed and forbidden calls. This section describes how delayed/forbidden lists
operate in each country that supports this feature.
Australia—Delayed Call Lists
The modem processes call attempt failures as delayed calls, according to PTT
regulations. Before dialing a number, the modem determines whether:
• The number is on the delayed list
• The delayed list is full (the list holds 10 numbers)
In either case, the number is not dialed. When the modem is turned off and then on
again, the lists are cleared, and the numbers can be dialed.
After dialing, the modem processes the following call failures as delayed calls:
• The modem receives a busy tone after dialing a call
• The call is not answered within the time in the Call Timeout (AT
*
TT) option
For these call failure conditions, nine subsequent redial attempts are allowed. If the
redial call attempts are unsuccessful after a total of 10 calls, the number is placed on
the delayed list. Then it cannot be dialed for 30 minutes. After 30 minutes, the
number is available for dialing.
Table C-11.
4-Wire Leased Line Interface (Models 3263/3268)
Dial Line
Connector Pin
Canada/Japan/
U. S. A.
Hong Kong/
South Africa/
United Kingdom
All Other
Countries
1 TX Ring Not Used TX Ring
2 TX Tip Not Used TX Tip
3 Not Used RX Tip RX Tip
4 Not Used TX Tip TX Ring
5 Not Used TX Ring TX Tip
6 Not Used RX Ring RX Ring
7 RX Tip Not Connected RX Tip
8 RX Ring Not Connected RX Ring