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Videoswitch
Any number of PCs can access any number of VDMs on a one-to-one basis, subject to the size of the
network. The network can be an independent network for the CCTV, or an existing computer network. In the
latter case, the network administrator may need to designate suitable IP addresses for the VDM(s) that avoid
conflicts with the PCs and printers on the network.
VDM
CAT5 CABLE
+
VDM/ETHER-1
4.1.4
Ethernet using a Cross-over Cable
Where access to a single VDM is required by a single PC, it is possible to connect the VDM directly using a
CAT5 cross-over cable. A VDM/ETHER-1 module must be installed in the VDM and the PC must have an
Ethernet card installed. Note that a fixed IP Address will have to be entered into the PC.
Image update rates of around four images per second are typical, depending on the image quality selected
in the Vi-connect remote access software. Using this configuration, one PC can access one VDM.
VDM
+
VDM/ETHER-1
4.1.5
Broadband (ADSL)
One or more VDMs can be accessed via the Internet from anywhere in the world if connected to a service
provider via an ADSL broadband router. A VDM/ETHER-1 module must be installed in the VDM and both
the ADSL router and the PC must have access to the Internet.
The ADSL router at the VDM end must have a fixed IP address so it can always be addressed remotely, and
must be configured to route connections with the specified port to IP address of the VDM(s).
The image update rate depends on the uplink speed and the downlink speed at the PC end. If a data rate of
128Kbit/s is available, image update rates of around two images per second are typical, depending on the
image quality selected in the Vi-connect remote access software. Note that where bandwidth is shared,
update rates may suffer. This is in contrast to ISDN where data rates are guaranteed.
VDM
+
VDM/ETHER-1
Note: please check that installed firmware revision supports this mode of operation (VDM001G7 or later).
Vdm601t.doc
ETHERNET HUB or SWITCH
CAT5 CROSS-OVER CABLE
ADSL ROUTER
CAT5 CABLE
INTERNET
VDM Digital Recorder
PC
+
Ethernet Interfa ce
+
"VDM Connect"
PC
+
Ethernet Interface
+
"VDM Connect"
PC
+
Internet Access
+
"VDM Connect"
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