Toshiba CTX28 manual LAN Problems

IP Telephony and QSIG Over IP

CTX IP Troubleshooting

Table 9-10 IP Troubleshooting Problems and Resolutions (continued)

No.	Problem	Action	Cause	How to Resolve
		Check the network equipment		Replace to Switching HUB.
		located on the routing path	Repeater HUB was used.	Toshiba recommends the
		between BIPU and IPT.		use of SW-HUB.”
				Reduce the number of
			Path band-width of the	connected IPTs.
		“Capture the network traffic	network between BIPU and	Apply the priority control.
	IPT has harsh noise	between BIPU and IPT, and	IPT was too narrow.	Change voice CODEC to
3	during talking or hearing	analyze the captured data.		G.729A”
	any tone.	Verify the following.
			Routing delay or packet loss
		(1)The interval of RTP packets is	due to low performance of	Same as above.
		almost same as the value	routing devices (router or L3
		configured by Prog 152-FK1.	switch).
		(2)This interval is constant.
			“Illegal packets were sent to
			BIPU/IPTs. Flow a lot of	Remove the originator.
			broadcast packets.”
	LAN Problems:
	“IPT is unable to connect			In case that some repeater
				HUB connects to the other
	to BIPU.		10M-repeater HUB and 10/
		Verify the specification of each		one having different link
4	Condition:		100M-repeater HUB were
		repeater HUB.		speed each other, one of
	Two repeater HUBs were		cascaded.
				those needs to have internal
	cascaded.”
				bridge circuit.
		“If priority control function	“Routers or LAN switches	Disable IEEE802.1p
			were unable to interpret	function. *note) Equipment
		(IEEE802.1p) was set to
			Ethernet frame with VLAN	not to be complied with
		““enable””, return to ““disable””
			tag correctly (IEEE802.1p	IEEE802.1Q/1p seem to
5	No voice path	and try again. If voice path was
			uses a part of VLAN tag	regard ethernet frames with
		restored, verify the specification
			field). So, these frames were	VLAN tag field as illegal
		of routers/switches between
			discarded by the router/	frames and to discard these
		BIPU and IPT.”
			switch.”	frames.
	“IPT is unable to connect		The IPT connection port was
	to BIPU.		configured as tag-based	Disable VLAN setting. IP-
	Condition:	Check the port configuration of	VLAN port. Therefore, this	CTX does not support tag-
6	IPT connects to LAN		port passed only ethernet	based VLAN. So, BIPU and
		LAN switch.
	switch complied with		frames with VLAN-ID same	IPT cannot belong any
	IEEE802.1Q (tag-based		as port configuration, and	VLAN.
	VLAN).”		discarded other frames.
	There are two gateways
	in the network segment			If default gateway is down
7	which BIPU belongs, and	-	restriction	for a while, BIPU cannot re-
	one of them is configured			route another gateway
	as default gateway of			automatically.
	BIPU.
				Setting up and starting
			DHCP server does not exists	DHCP service, or configure
	IPT Problems:	Check the DHCP server exists	on the network.	IPT’s IP address and Subnet
8	“IPT shows ““Can’t set			mask manually.
		on the same network as that IPT.
	IPaddress””.”		DHCP server is located	Setting up and starting
				DHCP service on the same
			beyond the router.
				network as that IPT.

IP Telephony and QSIG Over IP

Strata CTX I&M 06/04 9-37