R0106-HP MSR Router Series Layer 2 - WAN Command Reference(V7)

154
Views
ISDN BRI interface view
Predefined user roles
network-admin
Usage guidelines
Persistent Layer 1 activation is available only on network-side BRI interfaces.
For energy efficiency, a network-side ISDN interface typically deactivates the physical layer when the
data link layer connection is disconnected. To maintain physical layer connectivity when the data link
connection is lost, enable persistent Layer 1 activation. This function prevents Q.921 from sending
deactivation requests to the physical layer.
Persistent Layer 1 activation can only maintain the active state of the physical layer. It does not activate
the physical layer if you enable it when the physical layer is inactive. In contrast, Q.921 attempts to
establish data link connections if you enable permanent Q.921 link connectivity when no data link
connections are present.
NOTE:
Only BRI interfaces on the BSV module can operate on the network side.
Examples
# Enable persistent Layer 1 activation on BRI 2/4/0, a network-side BRI interface.
<Sysname> system-view
[Sysname] interface bri 2/4/0
[Sysname-Bri2/4/0] isdn protocol-mode network
[Sysname-Bri2/4/0] permanent-active
Related commands
• isdn protocol-mode
• isdn q921-permanent
power-source
Use power-source to configure a BRI interface to supply line power to the terminal equipment.
Use undo power-source to restore the default.
Syntax
power-source
undo power-source
Default
A BRI interface does not supply line power.
Views
ISDN BRI interface view
Predefined user roles
network-admin