Chapter 1:
Introduction
Page 1-6
MicroMMAC Installation Guide
FLASH EEPROMs
The MicroMMAC uses FLASH Electrically Erasable Programmable
Read Only Memory (EEPROM) which allows you to download new and
updated firmware using SPECTRUM Element Manager for Windows or
any device using BOOTP or tftp protocols.
The MicroMMAC supports the following download applications:
•
Standard Download
- the MicroMMAC automatically becomes
disabled while the new firmware image loads directly into Local
Dynamic Random Access Memory (LDRAM). You can
not
perform a
Standard Download through a BRIM interface.
•
Runtime Download - the MicroMMAC continues to operate without
interruption while you download the new firmware image directly into
FLASH memory. The original firmware image in LDRAM continues
to run until the MicroMMAC is reset. You can perform a Runtime
Download through any network port, including the BRIM.
1.6 STACKABLE CAPABILITIES
The MicroMMAC can be stacked together with Cabletron Systems SEH
series of non-intelligent hubs. You can stack as many as four
non-intelligent hubs with one MicroMMAC. The MicroMMAC provides
complete management for the stack, including full packet and error
statistics for the entire stack, individual device, or individual port. You can
also add or remove hubs from the stack without having to power down.
Stackable configurations let you maintain only one IEEE repeater hop
while providing up to 130 Ethernet ports. The rear panel HubSTACK
Interconnect Bus Out port of the MicroMMAC lets you daisy chain hubs
together using the HubSTACK Interconnect cable. Figure 1-1 shows a
typical stackable configuration.
