Commend GE 800, Product Manual

Page: 19 / 43

GE 800 4. Cabling
4.2/0617 19
Connection of multiple GE 800
G8-NET card
Multiple GE 800 Intercom Servers are connected via the Uplink and Downlink ports of the G8-NET card.
For the G8-NET card, no special configuration is necessary. A special “Discovery protocol” is used to
localise the other GE 800 Intercom Servers in the local network
.
Connection possibilities
VLAN
If the GE 800 Intercom Servers are connected via a switch, the switch must be VLAN capable.
Switches with auto-negotiation
If both the Intercom Server and the switch are configured to “Autonegotiation”, in certain cases the
connection cannot be built-up. The solution for this is a fixed configuration, e.g. “100 MBit / full duplex”
(
see page 27 ).
ATTENTION: Discovery protocol
To localise other GE 800 in the local network, the following IP address range is reserved:
“231.255.x.233” to “231.255.x.239” (“x” stands for the ID of the Intercom Server)!
With switch Without switch
If more than 20 servers shall be connected,
a switch is required (max. 105 GE 800). See the
following illustration:
Up to 20 GE 800 can be connected in series
directly via the G8-NET card (no switch
required). See the following illustration:
Advantages
 No restrictions for IP subscriber cards
 Redundant connections possible ( see
page 23 )

No additional costs
Disadvantages  Increased cost and power consumption

When one GE 800 in the chain fails, the
rest of the chain is disconnected as well
Restrictions  Max. 105 GE 800 in LAN
 Max. 20 GE 800
 No GE 800 fully equipped with IP subscriber
cards
NOTE: VLAN requirements
The VLAN IDs “254” and “255” must be available. Depending on the type of the switch, these IDs must
be configured.