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DLCI window 98
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 8 • Frame Relay
Full Enquiry Interval (N391)(frDlcmiFullEnquiryInterval)
Status Enquiry messages are of two different varieties: 1) Link Integrity Verification, which simply exchange
sequence numbers between peers and 2) Full Status messages, which is a request from the peer for the list of all
active/inactive PVCs. The default is 6.
Error Threshold (N392)(frDlcmiErrorThreshold)
N392 is the number of errors (T392 and T391 timeouts and sequence number errors) before action is taken.
Action consists of changing all the PVCs from active to inactive. N392 must be less than or equal to N393.
The default value is 3.
Monitored Events (N393)(frDlcmiMonitoredEvents)
Expected and unexpected events are counted up till the Event Count reaches N393, whereupon the Event
Count is cleared and the Error Threshold Count is cleared. Events consist of timer (T391 and T392) expira-
tions and received Status Enquiry messages. N393 must be greater or equal to N392. The default value is 4.
MultiCast Service (frDlcmiMulticast)
Not currently implemented.
Max Virtual Circuits (frDlcmiMaxSupportedVCs)
The maximum number of PVCs determines the amount of internal resources are allocated for the Frame Relay
system. The default value is 32.
LMI Interface (frDlcmiInterface)
LMI is used in the generic sense as an in-band signaling system. The signaling is slightly different depending
on which end of the Frame Relay Interface it is, or in other words its orientation. The User end issues periodic
STATUS ENQUIRY messages and waits for a STATUS reply from the Network. The USER setting is correct
if the T-DAC is a DCE connecting to a Frame Relay network. It is possible to configure an T-DAC to “look”
like a Frame Relay Network. By setting the LMI Interface to NETWORK, you can connect another Frame
Device directly to the T-DAC. This is also the setting if you were to connect two T-DAC back-to-back without
the benefit of an established Frame Relay network.
Bidirectional Polling (frDlcmiPollingBiDir)
Bidirectional Polling pertains only to the Network LMI side. If enabled, the Network LMI issues STATUS
ENQUIRY messages and waits for a STATUS reply from the User.
Polling Verification (T392)(frDlcmiPollingVerification)
Polling Verification pertains only to the Network LMI side. It is the amount of time permitted without receiv-
ing a STATUS ENQUIRY message from the User before Counting an Error.
DLCI window
The Data Link Connection Identifier (DLCI) provides each PVC with a unique identifier at both the T-DAC
and the Frame Relay switch. Within each link (DLMI) there can be multiple Permanent Virtual Circuits
(PVC). Each of these PVCs are point-to-point links to remote locations, and define the data path between the
T-DAC and the Frame Relay network.