
Chapter 21 BRI ISDN: BRI loop properties 235
BCM 4.0 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 77 illustrates the Settings tab.
Figure 77 Settings subpanel (T loops)
Table 47 describes the fields on this panel.
T-loop SPIDS and network DNs
The T-loop SPIDS and network DNs settings are available only for systems running a North
American profile. SPID numbers are supplied by the ISDN service provider. Also refer to “ISDN
overview” on page 709.
Figure 78 illustrates the SPIDs tab.
Table 47 Details for Loop
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 0-10 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.
Note: This parameter appears only when Overlap receiving is enabled.
Example:
Public received number = 4502303
Target line received numbers = 303
Local number length = 7
Public received number length = 3
Thus the first four digits are deleted by the system.
Send Name Display
(ETSI QSIG only)
<check box> If the switch allows outgoing name display, select the check
box.
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