AT&T MERLIN LEGEND Release 4.0 Feature Reference page 435

Feature Reference
NOTE:
Most Local Exchange Carriers do not offer multiple telephone numbers
associated with a single channel. Therefore, Routing by Dial Plan can only route
calls to a single data extension per a single telephone number provided by the
Local Exchange Carrier central office.
The three settings in the Incoming Routing Table are as follows:
Expected Digits–The number of digits sent from the service provider.
Digit Addition–Digits are added to the beginning of the digits.
Digit Deletion–Digits are deleted from the end of the digits.
An example Incoming Routing Table is shown in table 34.
Table 34. Sample T1 Switched 56 Dial Plan Routing Table
Entry
Service
Expected Digits 3
Example #
Digit deletion
Digit addition
Extension
Systemwide Programming Options
Clock Synchronization
Clock synchronization is an arrangement in which digital facilities operate from
a common clock. Whenever digital signals are transmitted over a
communications link, the receiving end must be synchronized with the
transmitting end to receive the digital signals without errors.
The system synchronizes itself by extracting the timing signal from the incoming
digital stream. If the system has one 100D module, that module provides its own
primary synchronization. If the system has at least one 800 NI-BRI module, more
than one 100D module, or a combination of 100D modules and 800 NI-BRI
modules, then one of the connections provides primary clock synchronization
for all 800 NI-BRI and 100D module ports and for the system's time-division
multiplexing (TDM) bus. The primary clock synchronization source must be
identified during system programming. The factory setting is the first 100D
module or the first port on the first 800 NI-BRI module in the carrier. This can be
changed through system programming.
1 2
T1 S56 T1 S56
3
234 235
1 1
[none] [none]
34 35
3 4 ... 24
T1 S56 T1 S56
3 3
300 492
1 1
67 69
6700 6992
Primary Rate Interface (PRI) and T1
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