Enabling Permanent Q.921 Link Connectivity On An Isdn Bri Interface; Enabling Persistent Layer 1 Activation On A Bri Interface - HPE FlexNetwork MSR series Configuration Manual

Enabling permanent Q.921 link connectivity on an ISDN BRI
interface
You can enable permanent Q.921 link connectivity only on user-side ISDN BRI interfaces.
When this feature is enabled, the ISDN BRI interface establishes and maintains permanent data link
connections automatically, regardless of whether or not a call is present.
When this feature is disabled, the ISDN BRI interface transits to the multiframe established state only
when a call is present. In multiframe established state, the interface disconnects the Q.921 link if no
Q.931 call is present when the T325 timer expires.
To ensure successful call setup when ISDN NI is used, you must enable permanent Q.921 link
connectivity.
To enable permanent Q.921 link connectivity on an ISDN BRI interface:
Step
1. Enter system view.
2. Enter ISDN BRI interface
view.
3. Enable permanent Q.921
link connectivity.

Enabling persistent Layer 1 activation on a BRI interface

Persistent Layer 1 activation is available only on network-side BRI interfaces.
NOTE:
Only BRI interfaces on the BSV module can operate on the network side.
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 set up data link connections if you enable permanent Q.921 link connectivity when no
data link connections are present.
To enable persistent Layer 1 activation an ISDN BRI interface:
Step
1. Enter system view.
2. Enter ISDN BRI interface
view.
3. Enable persistent Layer 1
activation.
Command
system-view
interface bri interface-number
isdn q921-permanent
Command
system-view
interface bri interface-number
permanent-active
116
Remarks
N/A
N/A
By default, permanent Q.921 link
connectivity is disabled.
Remarks
N/A
N/A
By default, a BRI interface
deactivates the physical layer
when the Q.921 data link is
disconnected.