CONFIGURATION EDITOR
SERIAL PORTS
ACCESS PORTS

Dial Backup Port

Backup Triggers / Timers

Clocking

Enabled Inter-Unit Session Resiliency

Full Status Polling Count (N391/nN1)

IP Parameters

Link Polling Timer (T391/nT1)

LLC Parameters

LLC2 Frame Format

Local Management Protocol

Modem Settings

Multiple Flag Separation

NAU Name

Port Initially Enabled

RNR Timeout

Session Switch Threshold

Signal Control

Speed

Virtual Bridge Number

Virtual Ring Number


The dedicated dial backup feature provides a more cost-effective alternative to the DTR-initiated dial backup function for a remote branch office. When configuring an access port exclusively for dial backup, you may set the port to run with either Hayes or V.25bis-compliant devices. In addition, you may configure the unit to backup traffic selectively.
 
Note:      If you connect the port to an external ISDN modem that supports V.25bis commands, you may use this connection over an ISDN network.
 

NAU Name

This optional name enables you to assign a name to the port. NAU names must be unique to the unit.
Range: Up to eight characters (A-Z, 0-9, @, #, $)
 

Port Initially Enabled

This option determines whether or not the port is enabled at system startup. If disabled, the port must be started manually by an operator.
Range: Enabled or Disabled
 

Clocking

This parameter defines the port's clocking.
Internal clocking enables the unit to emulate a physical DCE interface
External clocking enables the unit to emulate a physical DTE interface
X.21 clocking must be used for X.21 interfaces
Range: Internal, External, X.21 Internal, X.21 External
 

Speed

If the port provides clocking, this parameter sets the speed at which the link and attached devices operate.
If clocking is external, the link runs at the speed of the clocking device, up to the unit's maximum rate. For the best line performance, the speed should match that of the actual link.
Range: Any speed available from the pull-down list
 

Signal Control

This option enables you to define the physical settings used to determine the port's status.
 

Multiple Flag Separation

This switch defines whether or not the port will use multiple flag separation.
Range: Enabled or Disabled
 

Virtual Ring Number

This value defines the virtual ring number assigned to the frame relay WAN. This value must be unique to the network. If possible, leave it set to 2. If you assign another number, factory-fresh units will have an additional hop.
Do not assign numbers 1 or 3, they are reserved for factory-fresh units.
Range: 001 -- FFF
 

Virtual Bridge Number

In most cases, this value should not be changed. It defines the virtual bridge number for the WAN.
Range: 1 -- 9
 

Local Management Protocol

This protocol must match the one used by the network.
Range: Annex A, Annex D, or LMI
 

Link Polling Timer (T391/nT1)

This timer determines how frequently the unit sends a full status inquiry message to the frame relay network.
Range: 5 -- 30 seconds (in increments of 5)
 

Full Status Polling Count (N391/nN1)

This value defines the number of polling intervals that must expire before transmitting a Full Status request message.
Range: 1 -- 255 intervals
 

LLC Parameters

These values may be adjusted to fine-tune the ports performance.
 

LLC2 Frame Format

This parameter enables you to specify which LLC2 frame format the frame relay link can use.
Range: Token Ring, Ethernet Version 2, IEEE 802.3, or All
 

IP Parameters

These parameters must be defined if you intend to use IP or SNMP.
 

Enabled Inter-Unit Session Resiliency

Enable this feature if you have redundant FRADs configured on the host end.
Range: Enabled or Disabled
 

Session Switch Threshold

The remote FRAD maintains a session switch time-out counter for each session. When this counter equals the configured session switch threshold, this feature switches sessions with the same internal ring number from the primary to the parallel route. This is similar to a PVC failure. Sessions that do not have a parallel route defined are terminated immediately.
 
This parameter enables the detection of a lost virtual route. When traffic exceeds this threshold, the remote FRAD tries the parallel route. If the parallel route is also down, the remote FRAD tries the alternate route.
Range: 0 -- 15
 

RNR Timeout

This parameter defines the receiver not ready timeout value.
Range: 0 -- 9
 

Backup Triggers / Timers

Click on this button to identify the line failure that must occur to activate the dial backup port.
 

Modem Settings

Click on this button to define the parameters that enable the port to communicate with the modem.