Using Nfas For Isdn Pri - Lucent Technologies PortMaster 4 Configuration Manual

Configuring the PortMaster 4 for Channelized E1
Follow these steps to configure a Tri E1 board on the PortMaster 4 for channelized E1
service:
1. Set the view
Command> set view Slotnumber
2. Set the line for in-band signaling.
Command Slotnumber> set Line0 inband
3. Set the signaling protocol and the line provisioning.
Command Slotnumber> set Line0 signaling r2generic|mfr2 Profile
4. Set the framing format for the line.
Command Slotnumber> set Line0 framing crc4|fas
5. Set the encoding method for the line.
Command Slotnumber> set Line0 encoding hdb3|ami
6. Repeat Steps 2 through 5 for the other two lines on the Tri E1 board.
7. Save the configuration changes and reset the slot.
Command Slotnumber> save all
Command Slotnumber> reset slotSlotnumber
8. Use the following command to display the configuration for each E1 line:
Command Slotnumber> show Line0

Using NFAS for ISDN PRI

Non-facility associated signaling (NFAS) is an ISDN PRI protocol that allows you to
define one or two D channels to carry signaling messages for up to 20 T1 lines, or
interfaces. This feature relieves telephone companies and Internet service providers
(ISPs) of the need to provide D channel signaling for each T1 interface, and increases
bandwidth by making those D channels available to carry data.
Most telephone companies offer two varieties of NFAS:
• Standard NFAS—A PRI service in which one T1 interface provides D channel
signaling for an NFAS group of up to 20 interfaces
• NFAS with D channel backup (DCBU)—A PRI service in which two T1
interfaces provide D channel signaling for an NFAS group of up to 20 T1 interfaces
In the D channel backup system, one T1 interface is configured as the primary
interface and another is configured as the secondary interface. If the primary
interface fails, the secondary interface takes over signaling responsibilities for the
group. When the failed primary interface returns to service, it backs up the
secondary interface.
Configuring T1, E1, and ISDN PRI

Using NFAS for ISDN PRI

10-15