Entering Frame Relay Pvc Configuration Mode - Patton electronics SmartNode Series Software Configuration Manual

14 • Serial port configuration
The purpose of end-to-end FRF.12 fragmentation is to support real-time and non-real-time data packets on
lower-speed links without causing excessive delay to the real-time data. The FRF.12 Implementation Agree-
ment defines FRF.12 fragmentation. This standard was developed to allow long data frames to be fragmented
into smaller pieces (fragments) and interleaved with real-time frames. In this way, real-time and non-real-time
data frames can be carried together on lower-speed links without causing excessive delay to the real-time traffic.
End-to-end FRF.12 fragmentation is recommended for use on permanent virtual circuits (PVCs) that share
links with other PVCs that are transporting voice and on PVCs transporting Voice over IP (VoIP).
The fragmentation size depends on the available bandwidth the chosen codec and its packet length:
• The less bandwidth available per call the smaller the fragment size has to be configured.
• The shorter the voice packets the smaller the fragment size can be configured.
• The smaller the fragment size the bigger the overhead for long data packets.
The following table shows the minimum fragment size depending on the configured codec and its packet
length without fragmenting the voice packets:
Codec (bytes)
G.729
G.729
G.729
G.723
G.723
G.723
G.711
G.711
G.711
Entering Frame Relay PVC configuration mode
The permanent virtual circuit (PVC) is a virtual circuit that is permanently established. PVCs save bandwidth associ-
ated with circuit establishment and tear down in situations where certain virtual circuits must exist all the time.
The Frame Relay network provides a number of virtual circuits that form the basis for connections between
stations attached to the same Frame Relay network.
The resulting set of interconnected devices forms a private Frame Relay group, which may be either fully inter-
connected with a complete "mesh" of virtual circuits, or only partially interconnected.
In either case, each virtual circuit is uniquely identified at each Frame Relay interface by a Data Link Connection
Identifier (DLCI). In most circumstances, DLCIs have strictly local significance at each Frame Relay interface.
Assigning a DLCI to a specified Frame Relay sub interface on the SmartNode 2300 series device is done in the
PVC configuration mode. The DLCI has to be in the range from 1 to 1022.
Note
There is a maximum of eight PVCs that can be defined.
This procedure desribes how to enter the PVC configuration
168
Packet Period (ms)
10
20
30
30
60
90
10
20
30
SmartWare Software Configuration Guide
Minimum Fragment Size
52
62
72
66
90
114
122
202
282
Serial port configuration task list