Verilink FrameStart FSD (34-00291.F) Product Manual - Manual (Page 12)

6 F r a m e S t a r t D D S C S U / D S U a n d T 1 C S U / D S U a n d F r a m e S t a r t F S E
What is PVC Discovery in FrameStart?
Verilink has included support for PVC discovery at the remote end of each
end-to-end permanent virtual circuit. For the DDS and T1 CSU/DSU units,
this mode is initiated by the user upon installation and configuration of each
logical port in the network. Verilink takes advantage of RFC 1490 rules for
encapsulating data within the Frame Relay frame, and incorporates PVC
extensions for establishing a virtual loopback on each PVC to determine the
remote link characteristics. This information includes remote DLCI numbers,
unit identification, link status, and optional fields such as committed
information rates (CIR) and circuit delay. The user enables this operation for
all active DLCIs on the circuit by setting LMI Mode to On.
What is PVC Delay Testing?
FrameStart allows the user to test an active PVC for delay characteristics. A
DLCI can be selected and a delay calculation is performed end-to-end to
determine the performance characteristics of a particular circuit. This
operation is enabled by the user for any active DLCI on the circuit.
What is a WAN receive level?
On any transmission network, the signal level indicates the strength of the
physical transport system. The better the signal level, the better the
performance of the transmission system. Expensive analyzers are used today
to measure the signal level performance of the transmission network before
data networks are installed. The DDS and T1 CSU/DSU units provide a
simple diagnostic to display the receive level from the network unit. This
removes the need to have additional test equipment on site when installing
data networking components.
What is LMI Monitoring?
During normal operation conditions, FrameStart Monitor continually monitors
LMI traffic on the network to update DLCI tables in the unit. FrameStart
automatically detects new circuits or indicates an Alarm condition for inactive
circuits.
What is LMI Auto Sourcing?
During normal operating conditions, FrameStart automatically detects a failure
with the data equipment (router) and takes control of the circuit to keep the
network alive. This allows for quick fault isolation of the problem. When the
data equipment returns to service, FrameStart reverts to monitor mode.
What is SOS Mode?
During LMI Auto Sourcing, the unit can be configured to send a SOS frame
to the host site and indicate an alarm condition on a particular virtual circuit.
This makes remote troubleshooting and fault isolation quick and easy.