Frame Management Type

This must match the management type expected by the network provider. Selecting AutoLearn allows the system to automatically determine the management type based on the first few management frames received. If a fixed option is required the following options are supported:

• Q933 AnnexA 0393

• Ansi AnnexD

• FRFLMI

• None

Frame Learn Mode

This parameter allows the DLCIs that exist on the given WAN port to be provisioned in a number of different ways.

• None No automatic learning of DLCIs. DLCIs must be entered and configured manually.

• Mgmt Use LMI to learn what DLCIs are available on this WAN.

• Network Listen for DLCIs arriving at the network. This presumes that a network provider will only send DLCIs that are configured for this particular WAN port.

• NetworkMgmt Do both management and network listening to perform DLCI learning and creation.

Max Frame Length

Maximum frame size that is allowed to traverse the frame relay network.

Fragmentation Method

The options are:

• RFC1490

• RFC1490+FRF12

Frame Link Type

Default = PPP

Data transfer encapsulation method. Set to the same value at both ends of the PVC (Permanent Virtual Channel). The options are:

• None

• PPP Using PPP offers features such as out of sequence traffic reception, compression and link level connection management.

• RFC 1490 RFC 1490 encapsulation offers performance and ease of configuration and more inter-working with third party CPE.

• RFC1490 + FRF12 Alternate encapsulation to PPP for VoIP over Frame Relay. When selected all parameters on the Service | PPP tab being used are overridden.

DLCI

Default = 100 This is the Data Link Connection Identifier, a unique number assigned to a PVC end point that has local significance only. Identifies a particular PVC endpoint within a user's physical access channel in a frame relay.

RAS Name

Select the RAS Service you wish to use.

Tc

Default = 10

This is the Time Constant in milliseconds. This is used for measurement of data traffic rates. The Tc used by the system can be shorter than that used by the network provider.

CIR

(Committed Information Rate) Default = 64000 bps This is the Committed Information Rate setting. It is the maximum data rate that the WAN network provider has agreed to transfer. The committed burst size (Bc) can be calculated from the set Tc and CIR as Bc = CIR x Tc. For links carrying VoIP traffic, the Bc should be sufficient to carry a full VoIP packet including all its required headers. See the example below.

EIR

(Excess Information Rate) Default = 0 bps This is the maximum amount of data in excess of the CIR that a frame relay network may attempt to transfer during the given time interval. This traffic is normally marked as De (discard eligible). Delivery of De packets depends on the network provider and is not guaranteed and therefore they are not suitable for UDP and VoIP traffic. The excess burst size (Be) can be calculated as Be = EIR x Tc.

Address Length

The address length used by the frame relay network. The network provider will indicate if lengths other than two bytes are to be used.

N391

Full Status Polling Counter

Polling cycles count used by the CPE and the network provider equipment when bidirectional procedures are in operation. This is a count of the number of link integrity verification polls (T391) that are performed (that is Status Inquiry messages) prior to a Full Status Inquiry message being issued.

N392

Error Threshold Counter

Error counter used by both the CPE and network provider equipment. This value is incremented for every LMI error that occurs on the given WAN interface. The DLCIs attached to the given WAN interface are disabled if the number of LMI errors exceeds this value when N393 events have occurred. If the given WAN interface is in an error condition then that error condition is cleared when N392 consecutive clear events occur.

N393

Monitored Events Counter

Events counter measure used by both the CPE and network provider equipment. This counter is used to count the total number of management events that have occurred in order to measure error thresholds and clearing thresholds.

T391

Link Integrity Verification Polling Timer

The link integrity verification polling timer normally applies to the user equipment and to the network equipment when bidirectional procedures are in operation. It is the time between transmissions of Status Inquiry messages.

T392

Polling Verification Timer The polling verification timer only applies to the user equipment when bidirectional procedures are in operation. It is the timeout value within which to receive a Status Inquiry message from the network in response to transmitting a Status message. If the timeout lapses an error is recorded (N392 incremented).