
Chapter 19 BRI ISDN: BRI loop properties 189
Networking Configuration Guide
T-loop general settings
The Settings tab allows you to define loop characteristics. Note that not all of these settings are
required in all BRI markets. Figure 59 illustrates the Settings tab.
Figure 59 Settings subpanel (T loops)
Table 32 describes the fields on this panel.
ONN blocking Suppression bit: the system flags the call to the Central
Office (CO) so that the name and number is not sent to the
person you call.
Service code: VSC digits are dialed out before the called
number to activate ONN at the central office. These codes
are supplied by your service provider for the lines. Refer to
“ONN Blocking codes (North American systems)” in the
Device Configuration Guide (NN40020-300). PRI lines have
only one code, so do not require specific configuration.
Table 32 Details for Loop (Sheet 1 of 2)
Attribute Value Description
Clock source Primary External
Secondary External
Internal
Primary External - uses clock from PSTN
Secondary External - used if system has more than
one Loop
Internal - uses clock on BCM
Overlap: receiving <check box> Supports target lines in markets which use Overlap
receiving signaling on the BRI trunks. Overlap
receiving must be configured for each BRI loop.
Overlap: length <0-15> Set the local number length for loops to interfaces that
receive overlap rather than enbloc digits. This number
is the total length of the called party number received.
This number is used to calculate the number of
leading digits that need to be removed by the system.
Table 31 Loops main panel (Sheet 2 of 2)
Attribute Value Description
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