Communications - Agilent Technologies 7700 Series Site Preparation Manual

Communications

Network Connection to Company LAN (not needed for instrument operation)
If you need to connect the 7700 ICP- MS computer to your company LAN, we
only recommend connection via a switching HUB. A small 10/100 6 port switch
can be obtained from many sources at a low cost.
When connecting via a switching hub your IT department must reserve two fixed (static) IP
N O T E
addresses that share the same subnet mask and are dedicated to the 7700 ICP-MS.
How a Switching Hub Works
Suppose you want to send a packet of data from the PC to the 7700 ICP- MS.
The first time the packet is sent, it will go to the Server and the Server
determines where the 7700 ICP- MS is located. The packet is sent to the Switch
and the Switch sends it on to the 7700 ICP- MS. But the Switch memorizes the
location of the original message. Since the location of the original sender is on
the same Switch, the Switch builds a memory table within the Switch's internal
memory. Now the Switch can respond directly to the PC.
Once the 7700 ICP- MS sends a packet to the PC, it will have its location
memorized and again any traffic between the PC and the 7700 ICP- MS will not
have to go through the Server. Traffic is reduced on the LAN. The only time
that the corporate LAN is affected is on the initial packet.
The 7700 ICP-MS system does not support the use of a computer with two network
C A U T I O N
interface cards. It has been observed that the use of two network cards frequently
results in crosstalk between the cards. This crosstalk can cause communication
failures.
30 G3280-90010 (Rev.B) Agilent 7700 Series ICP-MS Site Preparation Guide