SYSTEM LUX 10n
10/100Mbit Modular Switched Hub
Obsolete
Basic Architecture
The system works on the store and forward principle i.e. an input message is stored and then sent to the desired output, the input message being interrogated to determine both its source and destination address.
The source addresses are used to construct an address table such that messages will only be sent to the unique destination port. The hub has to learn the port address from the input messages. Until the address is learnt the message is sent to all ports. If no message is received from that port for a specified time then it is deleted from the address table ( this process is called 'ageing' ). This gives some protection against terminals being moved between ports as it will not be recognized until either a packet is sent from the new port or it is 'aged' out.
Port Auto-
Each port will negotiate with its link partner to be able to connect using the maximum
data rate that is mutually achievable, in this order :-
100Mbit Full Duplex
100Mbit Half Duplex
10Mbit Full Duplex
10Mbit Half Duplex
Module options
STP 4 port 10/100 RJ45 connector
STP 1 port 10/100 RJ45 connector
FO 1 port 10 ST connectors
FO 1 port 100 ST or SC connectors
FO 1 port 1Gbit MT-
Specification
Power 85~264Vac 50~60Hz 40VA IEC inlet
Cooling Forced air by 2 internal fans
Indicators Link -
( all modules) Data -
Dimensions 432 x 285 x 44 (rack mounts add 25mm each side)
Temperature 0 deg.C ~ 55 deg.C (operating)
Humidity 10% ~ 90% (non-
Standards IEEE 802.3, IEEE802.3u, IEEE802.3z, CE
Optical Receiver sensitivity better than -
Transmitter power (mean optical power) better than -
Wavelength 830nm (1300nm for 100 Base FX)
Link length in excess of 2km
Part Number |
Description |
Price |
VES- |
Base Unit. Holds up to 8 Modules |
Obsolete |
VES- |
Base Unit. Holds up to 16 Modules |
Obsolete |
VES- |
Base Unit. Holds up to 24 Modules |
Obsolete |
VES- |
Load Share Base Unit. Holds up to 8 Modules |
Obsolete |
VES- |
Load Share Base Unit. Holds up to 16 Modules |
Obsolete |
VES- |
Load Share Base Unit. Holds up to 24 Modules |
Obsolete |
VES- |
1 port UTP | |
VES- |
4 port UTP | |
VES- |
Single port 10Mbps Fibre with ST connectors | |
VES- |
Single port 100Mbps Fibre with ST connector | |
VES- |
Single port 100Mbps Fibre with SC connector | |
BAT69 |
Battery |
* For single mode add £25.00 for each module
In a switch the least reliable module is the fan and PSU. The fan problem can be reduced by using good quality components and to operate fans in parallel. The fan usually becomes noisy before complete failure so there normally is time to replace it.
The PSU is highly stressed both by transients and temperature. The PSU itself has
filters mainly for EMC but they also offer some transient protection. If the operating
temperature of the PSU can be reduced then the reliability will be significantly
increased. This can be achieved by either de-
VolAmp Ltd has now introduced a load share chassis into its range to cater for the requirement for high reliability. The chassis incorporates two PSU's and a load share monitor circuit. Should any supply fail then an audible signal is emitted and the faulty PSU can be replace at a convenient time. The monitor circuit identifies the faulty supply via LED's which are visible once the lid is removed.
The chassis have been designated as =
VES-
VES-
VES-
Physically the Load Share chassis is identical to the normal single supply unit.