Black Box IS425A, Manual

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IS425A - ISDN Terminal Adapter with S/T-Interface
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2. In the section labeled Service Profile Identifiers - SPID, click inside
the Tel Port #1 window and enter a SPID. A SPID is the number
that identifies each terminal equipment to the Telephone Company.
Notice that the SPID is automatically copied to
Data Port #1 .
⇒
Note: Your local phone company assigns SPIDs. Only the Data
Port and the Tel Ports can share SPIDs. The Tel Port or Data
Port cannot share the same SPID with any S/T devices.
3. In the section labeled Directory Numbers, click inside the Tel Port
#1 window and enter the phone/directory number that corresponds to
the Tel Port #1 SPID window. Notice that the DN is automatically
copied to Data Port #1 .
4. Repeat steps 3 and 4 for Tel Port #2.
⇒
You must enter a different SPID and Directory number than the
SPID and Directory number entered in TEL Port #1.