Remote Access; Configurations; Pstn; Isdn - Videoswitch VDM-4G80 User Manual

Videoswitch

4 Remote Access

4.1

Configurations

The various standard remote access configurations are illustrated in the following diagrams.
4.1.1

PSTN

Standard telephone lines (PSTN) provide the lowest cost and easiest method of achieving remote viewing of
images. A VDM/PSTN (modem) module must be installed in the VDM and the PC must have a standard
internal (or external) modem fitted. A telephone socket is required both at the VDM and at the PC end.
Image update rates of around an image every two seconds are typical, depending on the image quality
selected in the VDM-Connect remote access software.
The public telephone network is worldwide, and any number of PCs can access any number of VDMs on a
one-to-one basis.
VDM
+
VDM/PSTN
4.1.2

ISDN

ISDN provides almost instant dialling and faster update rates than PSTN. A VDM/ISDN module must be
installed in the VDM and a VDM/ISDN/TA terminal adaptor must be attached to the PC. An ISDN socket is
required both at the VDM and at the PC end.
Image update rates of around an image per second are typical, depending on the image quality selected in
the VDM-Connect remote access software.
The ISDN network is available in many countries (subject to regional variations), and any number of PCs
can access any number of VDMs on a one-to-one basis.
VDM
CAT5 CABLE
+
VDM/ISDN
4.1.3

Ethernet Local Area Network (LAN)

Ethernet provides almost instant connection and faster update rates than ISDN. A VDM/ETHER-1 module
must be installed in the VDM and the PC must have an Ethernet card installed.
Image update rates of around four images per second are typical, depending on the image quality selected
in the VDM-Connect remote access software. Local area networks (LANs) generally employ Ethernet hubs
or switches, and the VDM plugs into this in the same way as a PC. Standard CAT5 cables are used
throughout.
Vdm601r.doc
MODEM CABLE
INTEGRATED
SERVICES
DIGITAL
NETWORK
(ISDN)
PUBLIC
MODEM CABLE
SWITCHED
TELEPHONE
NETWORK
(PSTN)
CAT5 CABLE
VDM/ISDN/TA
VDM Digital Recorder
PC
+
PSTN MODEM
+
"VDM Connect"
RS232 (SERIAL)
PC
CABLE
+
"VDM Connect"
13