CentreCOM 3600 Series Hub/Repeaters
5
Chassis slots are numbered from 1 (top) through 8 (bottom). The Master is
defined as the module in the lowest-numbered (physically topmost)
occupied slot position. Typically this is slot 1, but it could be slot 2 if slot 1
is vacant.
A second manageable AT-3600 module may be installed in the slot directly
below the Master to serve as a
Backup
management unit. This special
module always occupies the next higher-numbered slot position below the
Master so it can immediately take over the Master’s functions if necessary.
Slave modules (AT-3624TS and AT-3624TRS) may occupy any other
higher-numbered slot position in the chassis—they do not need to be
adjacent or contiguous. (In other words, Slave units may be separated by
empty chassis slots.)
Network Management Planning
Before installing and connecting manageable AT-3600 Series hubs at
various site locations (such as in closets in a single building or in closets
on different floors or in different buildings), you need to decide on the
number of hubs in your network and where each hub is to be located. This
advanced planning will facilitate the assignment of hub names, MAC and/
or IP addresses. It will also maximize the efficiency of network
management once your hubs are fully installed and operational.
MAC Address
All “intelligent” ATI hubs (those with management capabilities) require a
unique 6-byte (12-digit) Media Access Control (MAC) address which
includes a 3-byte (6-digit) company identification number.
The MAC address is a unique number assigned to the nodes using the
network. The MAC address is used to resolve conflict when multiple
computers are trying to access the network simultaneously. This IEEE
physical storage location address resides in the MAC PROM and is
accessed through an ASCII terminal.
In order to make this address easily accessible and externally visible, a
MAC address label will be affixed on all products within the proximate
location of the RS232, BNC or AUI port.
The example shown in Figure 3 is a MAC address label placed above a
RS232 port on an AT-3612T hub.
