Bedienungsanleitung NetBotz NBWL0455 (Seite 100 von 154) (Englisch)

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91NetBotz Appliance User’s Guide

Managing your appliance using a dial-In PPP connection

When dial-in support is enabled, the appliance places the external modem in auto-answer mode. This

allows you to initiate a dial-in connection to the appliance through the external modem. To authenticate a

PPP connection, you must provide a user ID and password for a user account with Administrator access.

Once the PPP connection is established, you can access the appliance using the IP address 192.168.254.1.

Note: IP traffic is not routed through the appliance, so you cannot use the appliance PPP

connection to access other devices or systems on the same Ethernet network as the appliance,

if the appliance is connected to an Ethernet network as well as a modem.

PPP performance considerations

PPP/Modem connections are slower than Ethernet and wireless network connections. Using SSL to

communicate with an appliance over a PPP/Modem link slows communications further. If the appliance

attempts to send too much data over a PPP connection, some events never get delivered or get delivered

long after they occur.

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

connection, some functions are unavailable and performance is limited. The use of NetBotz Surveillance

with StruxureWare Data Center Expert on appliances connected to the network using PPP is not

supported. Performance can become worse if the PPP connection is lower than 25000 V42bis or the

appliance is configured to send large files such as images and audio. Some performance issues include:

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

on the appliance, an External Storage System, or the NAS, loading the Alerts View may take a

long time, or the Alerts view may fail to load. If this is an issue, limit the number of alerts by

clearing the Include “Returned to Normal” Alerts check box. Once you have successfully

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

View periodically reloads the Alerts View. This impacts the amount of data that the appliance can

send over the PPP connection and could prevent you from loading alerts or other data.

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

enable streaming audio, you may 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, performance is degraded.

• Delivering Higher Resolution Images, Setting High Frame Rates: If your appliance generates

alert notifications that include large amounts of image data, delivery of the notifications is delayed

due to the slow PPP connection. If too many notifications are delayed, some notifications will not

be sent. Appliances communicating using PPP should have their Camera Pod Capture settings and

Cameras View frame rates set to 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 or audio clips can take a long time. If the alert includes audio, the audio may not load

properly and may not be synchronized with the images. Loading alerts that include many image

captures in the Web Client over a PPP/modem connection can be slow and can cause the browser

to become unstable. Therefore, when using a PPP connection to view alerts, use Advanced View.

• Performing Multiple Alert Actions Simultaneously: Appliances communicating over a PPP

connection should not be configured to perform more than two alert actions simultaneously,

particularly if the alert actions include sending image captures or if any of the actions use the Send

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