Verilink WANsuite 5165 (34-00301.H) Product Manual - Manual (Page 57)

W e b S e r v e r I n t e r f a c e 3-27
N2 The N2 counter specifies the total number of link reliability errors and
protocol errors that can occur during the sliding event monitor count defined
by N3. If this count is exceeded, the port is declared inactive.
Values: 1–255
Default: 3
N3 This counter represents a Monitored Events Count. For a network, a
monitored event is the receipt of a status inquiry message or the expiration of
the polling verification timer T2. For a FRAD, a monitored event is the
transmission of a status inquiry message. This parameter defines the size of
the sliding window used by the unit to determine whether a channel or user
device is active.
Values: 5–255
Default: 4
T1 This parameter specifies the number of seconds the unit waits between issuing
status enquiry messages.
Values: 5–30
Default: 10
RFC1315 Trap When this parameter is set to “Enable,” the unit will send the standard
RFC1315 frame relay DTE circuit state change trap every time a DLCI
changes state, provided at least one destination IP address for trap is
configured in the SNMP configuration.
Values: Disable, Enable
Default: Disable
Normal Tx Queue Size Each Frame Relay service has two distinct transmit queues: one for normal-
priority traffic and one for high-priority traffic. At this time, only SCADA and
TCP Server traffic are considered high-priority and are placed in the high-
priority queue. All other types of traffic are placed in the normal-priority
queue.
This parameter defines how many normal priority frames can be put in front
of a high-priority frame. The software always checks for high-priority frames
before placing normal-priority frames in the transmit queue. However, once
the frames are in the hardware transmit queue, their order of transmission
cannot be changed.
If SCADA and/or TCP Server are not up, set this parameter to 28 (the
default). If SCADA and/or TCP Server are up, set this parameter according to
the SCADA host system’s ability to support higher latency. For example, if a
SCADA host system has a timeout of 500 ms when polling remote devices
through a DDS Frame Relay service, the Normal Tx Queue Size parameter
should be set to 2. This would allow two 1500-byte IP frames to be sent
between SCADA frames without reaching the 500-ms limit. If the SCADA
host application has a timeout lower than 500 ms, this parameter should be set
to 1. This then ensures a minimum latency for SCADA applications.
However, it will slow IP traffic since only one IP frame at a time can be
placed in the hardware transmit queue.