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48 Chapter 5 R2MFC card maintenance
N0087114 1.0
During call setup, the following information is passed between the Norstar and the CO:
1 Dialed digits — Dialed digits are passed without any change. Up to 24 digits can be dialed.
The MFC trunk is capable of repeating dialed digits on outgoing calls to the CO, when
requested according to protocol.
Digits are passed immediately to Norstar as they are received (PRI overlap mode) on incoming
calls from CO to Norstar. This causes the Norstar to determine end of dialing, and to
immediately signal call completion.
2 Calling number — (in PRI: CLID; in MFC: ANI) This number is passed without any change,
and can be up to 16 digits long.
3 Termination status — Termination status is translated as presented in the Table 6. The table
shows both directions. When translating a signal, only the bold value is used.
Other protocol-specific fields are not translated from side to side. They are handled as described
Table 6 in the protocols implementation.
Clock synchronization
By default, the R2MFC card synchronizes on the external E1 line, and transmits this clock on the
internal link to the Norstar. By doing so, the Norstar can synchronize on the external link.
Slips can occur between the Norstar and the R2MFC card, if the Norstar must synchronize on
another DTI card. To avoid slips, the R2MFC card must synchronize on the internal link to the
Norstar, instead of the external E1 line. Synchronization settings can be set up by using the CLI.
See Chapter 6, “Command Line Interface (CLI),” on page 59 for commands available through the
CLI.
Table 6 Translation of Subscriber Status
Subscriber State PRI Signal MFC Signal
1
1 MFC signal is indicated by meaning. Actual signal depends on country; ITU/T standard is indicated in parentheses.
Free (ringing) ALERTING BW_FreeCharge (B6)
BW_FreeNoChrg (B7)
Busy Cause 17 BW_Busy (B3)
Unallocated number Cause 1 BW_Unlocated (B5)
Network congestion
or general failure
Cause 42
All other values
BW_B_Congest (B4)
Unknown signal
Line out of order Cause 27 BW_OutOfOrder (B8)
Number changed Cause 22 BW_ChangOrder (B2)