Nortel Networks R2MFC 사용자 설명서
62 Chapter 6 R2MFC MBM maintenance
NN40010-300
During call setup, the following information is passed between the BCM 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.
requested according to protocol.
Digits are passed immediately to BCM as they are received (PRI overlap mode) on incoming
calls from CO to BCM. This causes the BCM to determine end of dialing, and to immediately
signal call completion.
calls from CO to BCM. This causes the BCM 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.
. 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
in the protocols implementation.
Clock synchronization
By default, the R2MFC MBM synchronizes on the external E1 line, and transmits this clock on the
internal link to the BCM. By doing so, the BCM can synchronize on the external link.
internal link to the BCM. By doing so, the BCM can synchronize on the external link.
Slips may occur between the BCM and the R2MFC MBM, if the BCM needs to synchronize on
another digital trunk MBM. To avoid slips, there is an option for the R2MFC MBM to synchronize
on the internal link to the BCM, instead of the external E1 line. Synchronization settings can be set
up by using the CLI. See
another digital trunk MBM. To avoid slips, there is an option for the R2MFC MBM to synchronize
on the internal link to the BCM, instead of the external E1 line. Synchronization settings can be set
up by using the CLI. See
for commands
available through the CLI.
Table 9 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)
BW_FreeNoChrg (B7)
Busy
Cause 17
BW_Busy (B3)
Unallocated number
Cause 1
BW_Unlocated (B5)
Network congestion
or general failure
or general failure
Cause 42
All other values
All other values
BW_B_Congest (B4)
Unknown signal
Unknown signal
Line out of order
Cause 27
BW_OutOfOrder (B8)
Number changed
Cause 22
BW_ChangOrder (B2)