JVC VN-C20 Instructions Manual page 72

Others
Symptom
Multicast images cannot be
played back
The frame rate of the
displayed image is low
A white zone appears in the
built-in viewer.
Unable to receive alarm
notification at the computer
via TCP/UDP
72
Causes and Countermeasures
● Start multicast transmission manually from the
[Streaming] page of VN-C20.
● In the case of multicast reception at the built-in
viewer, check that the multicast address and port
number of the built-in viewer settings coincide
with those on the [Streaming] page of VN-C20.
Make use of a network that supports IGMP for
multicast transmission.
● Multicast may be blocked by the WindowsXP
firewall.When this occurs, perform the following
to allow it to pass through.
● Double-click on [Windows Firewall] in [Start]-
[Control Panel], click the [Add Port...] button
under the Exception tab, followed by
registering the port number in the port
number field for which you want it to pass
through. Enter an arbitrary character string in
the name field.
● Check the settings on the [Encoding] page of the
VN-C20 unit.
● Check the built-in viewer settings as well when a
built-in viewer is in use.
● Frame rate will be constrained when the network
bandwidth is narrow.
● For some computers, a part of the Internet
Explorer graphics may not appear and is left
white when the following setting is performed on
the Internet Explorer.
● Right-click on the Desktop screen. If −
[Properties]−[Settings]−[Advanced]−
[Advanced]−[DPI setting] is set to ALarge
sizeB or ACustom sizeB, select ANormal sizeB to
resume normal drawing.
● Data may be blocked by WindowsXP
firewall.When this occurs, perform the following
to allow it to pass through.
● Double-click on [Windows Firewall] in [Start]-
[Control Panel], click the [Add Port...] button
under the Exception tab, followed by
registering the port number in the port
number field for which you want it to pass
through.Enter an arbitrary character string in
the name field.
Reference
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