Lucent Technologies Release 8.2 manual Maintenance-Related System Parameters, IP Parameters

H.323 Trunk Administration 2 H.323 Trunks

Maintenance-Related System Parameters

Four parameters on the Maintenance-Related System Parameters screen set threshold values for network performance:

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•	Roundtrip Propagation Delay (sec)	High: 800_	Low: 400_
•	Packet Loss (%)	High: 40__	Low: 15__

•Ping Test Interval (sec): 20

•Pings per Measurement Interval: 10

These parameters have no effect unless the bypass function is activated on the Signaling Group screen. If the bypass function is activated for a signaling group, ongoing measurements of network activity collected by the system are compared with these values. If the values of these parameters are exceeded by the current measurements, the bypass function terminates further use of the network path associated with the signaling group. The following actions are taken when thresholds are exceeded:

•existing calls are maintained

•incoming calls are allowed

•outgoing calls are blocked on this signaling group; if so administered, blocked calls are diverted to alternate routes (either IP or circuits) as determined by the administered routing patterns

You can use the default values set for these parameters, or you can change them to fit the needs of your network. The Maintenance-Related System Parameters screen can be administered by the init, inads, or craft logins. Open the screen with the change command (ch sys ma).

IP Parameters	The IP Media Parameters screen allows you to specify the type of codec used for
	voice encoding and companding (compression/decompression). The main difference
	between codecs is in the compression algorithm used: some codecs compress the
	voice data more than others. A greater degree of compression results in lower
	bandwidth requirements on the network, but may also introduce transmission delays
	and lower voice quality.
	The default codec is set for G711. The G711 provides the highest voice quality
	because it does the least amount of compression, but it uses the most bandwidth. The
	G711 default setting can be changed to one of four other codecs if the G711 does not
	meet your desired voice-quality/bandwidth tradeoff specification. Also, if the far-end
	switch is a not a DEFINTIY ECS, you may need to change the codec to match one
	that is supported by that switch.
	The order in which the codecs are listed on this screen is the order of preference of
	usage. A trunk call between two DEFINITY switches will be set up to use the first
	common codec listed on the two IP Parameters screens.
	NOTE: The codec ordering must be the same on DEFINITY switches at
	both ends of an H.323 trunk connection. The set of codecs listed need
	not be the same, but the order of the listed codecs must be the same.

		Administration for Network Connectivity
34	CID: 77730	555-233-504 — Issue 1 — April 2000