topic Hi, Stephen, WIFI phone in Wireless

High latency between PDA and Laptop in the same SSID and VLAN

rockzhang1 — Mon, 05 Jul 2021 10:18:39 GMT

Hi,

we are using CISCO 5508 WLC and got High latency between PDA and Laptop in the same SSID and VLAN, latency is around 300ms...but between laptop, the latency is 5ms.

May I know what can cause this problem?

thank you so much indeed.

There could be a lot of

Stephen Rodriguez — Thu, 28 May 2015 13:11:18 GMT

There could be a lot of things that could cause that. What band the devices are on, what their chipset is, what the driver version is, what the CPU on the device is etc.

What is the particular PDA? what are it's specs? does it have enough RAM and CPU power?

what are you using to test the latency, ping? I don't trust ICMP, it's low priority traffic and can be dropped or delayed if there is any congestion.

Steve

Hi, Stephen, WIFI phone

rockzhang1 — Fri, 29 May 2015 04:37:51 GMT

Hi, Stephen,

WIFI phone detais

OpenStage WL3

SW version

5.1.24

WLAN version

3.5.d

WLAN information

FAVO SSID

Security mode

WPA-PSK/WPA2-PSK

Beacon period : 102

DTIM :1

QOS: WMM&WMM-PS

Txpower 14dbm

Please refer to the link for

Abhishek Abhishek — Tue, 02 Jun 2015 06:00:52 GMT

Please refer to the link for troubleshooting network latency issues-

http://support.internetconnection.net/THE_WWW/Troubleshooting_Network_Latency.shtml

Hi, What band do you see on

shabeer G — Wed, 03 Jun 2015 08:04:14 GMT

Hi,

What band do you see on the controller for the devices which has high latency?

If it is on 2.4 try enabling band select on the WLC and see if it improves the latency as the clients will try to connect to the 5Ghz band if it supports.

Thanks

Small devices like to use

George Stefanick — Wed, 03 Jun 2015 12:47:18 GMT

Small devices like to use power save. For example if I ping my Cisco phones they show high latency because they are constantly going to sleep to save battery. Once in a call the radio is active and latency is gone. A packet capture could show this or your pda may allow you to configure power save.

Check the power save setting

Prakash Parvathala — Wed, 03 Jun 2015 13:32:16 GMT

Check the power save setting on wireless client, if enabled for max battery then set to CAM or continuous awake mode.

Hi,Enterprise grade equipment

abwahid — Thu, 11 Jun 2015 09:42:20 GMT

Hi,

Enterprise grade equipment will have more features. Some will help you identify the issue. Use a tool like inssider to check if there are other APs in the area which may be interfering. Any nearby network on the same channel, or adjacent channels for that matter.

inssider is a great tool no

gohussai — Fri, 12 Jun 2015 13:05:41 GMT

inssider is a great tool no doubt to check the neighbor LAPs. But you do proper survey with the said tool given below ,it also gives you best results.

http://www.ekahau.com/wifidesign/ekahau-site-survey

inssider