M.1.2.4 "Primary" tab (only PRI cards)
First B channel:
If you use an ISDN interface with less B channels than the standard ISDN interface, enter the first B channel to be used during connection setup.
Standard setting: 1, for E1 and T1 (European and US standard).
Last B channel:
If you use an ISDN interface with less B channels than the standard ISDN interface, enter the last B channel to be used during connection setup.
Standard setting:
30 for E1 (European standard)
23 for T1 (US standard)
Line code:
Select the line code for the T1 or E1 interface in the list field.
B8ZS for T1 (US standard)
HDB3 for E1 (European standard)
Framing format:
Select the framing format for the T1 or E1 interface in the list field.
Standard setting:
ESF - for T1 (US standard)
CRC4 Multi Frame - for E1 (European standard)
Double Frame - mainly used in France and Belgium.
Bus termination:
Select a bus termination resistance between 75 and 120 ohm in this list field.