APC NBRK0320E Datasheet download pdf (Page 135)

Advanced View: Configuring Appliances

126 Using Your Appliance

When monitoring or managing an appliance that is connected to your network using only a PPP/Modem

connection, some functions may be unavailable and some performance limitations will be apparent.

These limitations can become far worse if the PPP connection is slow (lower than 25000 V42bis) or the

appliance is configured in a manner that causes it to send a lot of images, audio, or other data. Some

performance issues that will occur include:

• Loading the Alerts View: If the appliance currently has a very large number of active or resolved

alerts stored on the appliance (or, more likely, stored on an Extended Storage System or NAS),

loading the Alerts View may take a very long time, or may even fail to load correctly and

completely. If this is an issue, limit the number of alerts that are being loaded by un-checking the

Include “Returned to Normal” Alerts check box. Also, once you have successfully loaded the

Alerts View you must set the Refresh Interval value to None. If you do not do this the Advanced

View will automatically attempt to periodically reload the Alerts View, which will greatly impact

the amount of data that the appliance can send over the PPP connection and could prevent you from

being able to load alerts or other data.

• Streaming Audio: Streaming audio does not perform well over PPP/Modem connections. If you

enable streaming audio, you will likely encounter large gaps in the audio stream.

• Access by Multiple Clients: If more than one client is accessing an appliance over a PPP/Modem

connection simultaneously performance will be severely degraded.

• Delivering Higher Resolution Images, Setting High Frame Rates: Large image captures (as part

of an alert notification, or simply delivering images for viewing in the Cameras View) can take a

significant amount of time. If your appliance is generating a lot of alert notifications, all of which

include large amounts of image data, delivery of the notifications will get delayed due to the slow

PPP connection. If too many notifications get “backed up” on the appliance notifications can start to

get dropped. Appliances that will be communicating using PPP should have their Camera Pod

Capture settings and Cameras View frame rates set to with the lowest acceptable values (320x240, 1

frame every 10 seconds respectively).

• Viewing Alert Captures: Loading and viewing alerts that include a large number of image captures

and/or audio clips can take a very long time. Also, if the alert includes audio the audio may not load

properly, and may not be synchronized with the images. Also, loading alerts that include many

image captures in the Basic View over a PPP/modem connection can be extremely slow, and can

cause the browser to become unstable. When using a PPP connection to view alerts, we strongly

recommend you use the Advanced View to do so.

• Performing Multiple Alert Actions Simultaneously: Appliances that will be communicating over

a PPP connection should to be configured to perform more than 2 alert actions simultaneous,

particularly if the alert actions include image captures or in any of actions use the Send Data to FTP

Server notification method. This can cause notifications to get “backed up” on the appliance, which

can result in notifications getting dropped.

• Sensor Data Fails to Load: If the appliance is in the process of transmitting a large amount of data

(caused by Maximum Rate or Mode settings in the Cameras View or by attempting to load an alert

that includes graphs or a large amount of image and audio data, for example) attempts to load sensor

data may fail. Once load on the appliance has been reduced, the sensor data will re-appear

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APC NBRK0320E Datasheet Page 135

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APC NBRK0320E Datasheet Page 135

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