Specifying An Isdn Bri Interface To Be In Permanent Active State On Physical Layer; Enabling Remote Powering On An Isdn Bri Interface - 3Com MSR 50 Series Configuration Manual

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Specifying an ISDN BRI
Interface to be in
Permanent Active State
on Physical Layer
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Enabling Remote
Powering on an ISDN
BRI Interface
On PRI interfaces, Q.921 layer negotiates to enter multi-framing state immediately
after the user side and the network side connects correctly. On BRI interfaces,
however, the Q.921 layer transits to the multi-framing state only after being
triggered by a call and the Q.921 link that has been set up will be torn down if no
Layer 3 call is received before the T.325 timer expires.
On a BRI interface operating on the network side, the T325 timer is triggered
when the link is torn down on data link layer and deactivating requests are sent
from data link layer to physical layer when the timer expires. Deactivating request
causes BRI interface to turn to active mode on physical layer and thus helps reduce
power consumption. To make a BRI interface to remain in the active state on
physical layer even if no link exists on the data link layer, you can perform the
operations listed in the following table, through which you can disable
deactivating request sending.
Follow these steps to specify an ISDN BRI interface to be in permanent active state
on physical layer:
To do...
Enter system view
Enter specified BRI interface
view
Specify the BRI interface to be
in permanent active state on
physical layer
The support for this function varies with device models.
■
This function is only applicable to BRI interfaces operating in the network side
■
mode. Currently, only BSV board can operate on network side.
This function is different from the permanent link function. The former
■
maintains the active state of BRI interfaces on physical layer and is only
applicable to BRI interfaces operating on the network side. It cannot activate
the BRI interfaces that are in inactive state on physical layer. The latter,
however, enables BRI interfaces to enter Q.921 multi-framing state
immediately after the user side and the network side connects correctly. It is
only applicable to BRI interfaces operating on the user side. If you enable the
permanent link function while no Q.921 link is established, the system
attempts to establish Q.921 links.
Follow these steps to enable remote powering on an ISDN BRI interface:
To do...
Enter system view
Enter specified BRI
interface view
Enable remote powering
on the interface
Use the command...
system-view
interface interface-type
interface-number
permanent-active
Use the command...
system-view
interface interface-type
interface-number
power-source
Configuring ISDN
Remarks
-
-
Optional
A BRI interface is not in
permanent active state on
physical layer
Remarks
-
-
Optional
The remote powering function is
disabled on an ISDN BRI interface by
default.
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