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1.2.2 The Intelligent Cooling Subsystem
The cooling subsystem consists of 3 fans, each of which cools a specific area of
the hub. Each of the fans has a sensor to detect a slow or stopped condition and
a temperature sensor to detect an over temperature condition. In conjunction
with the Controller module and the DMM the hub environment can be monitored
and controlled for over temperature conditions. Fan and Temp LEDs on the
Controller module can also alert the user to potential problems. The intelligent
cooling subsystem is described in detail in Chapter 6, “8260 Intelligent Cooling
Subsystem” on page 91.
1.2.2.1 Distributed Management Architecture
To fully manage the 8260 and the installed modules, the 8260 uses a distributed
management architecture. In this architecture, the various tasks of managing
the various elements of the hub are distributed across the following elements:
•
Distributed management module
•
MAC daughter cards
•
Controller module
There are 2 types of distributed management module (DMM):
•
Stand-alone DMM
•
EC-DMM
In terms of management functions, DMM and EC-DMM are identical. The only
difference between these two cards is their ability to house Ethernet MAC
daughter cards.
The DMM, along with the fault-tolerant Controller module, manages and controls
the 8260 hub and its modules. However, to perform certain management
functions such as network traffic monitoring, there is a need for a daughter card
to assist DMM. There are two types of daughter cards:
•
Ethernet Media Access (E-MAC) daughter card
•
Token-ring Media Access (T-MAC) daughter card
The combination of DMM and daughter cards provides a cost efficient
management architecture that consolidates media management into a single
card, while distributing network monitoring across a series of protocol dependent
daughter cards. Detailed information about the distributed management
architecture of the 8260 and the management modules and daughter cards is
provided in Chapter 4, “8260 Distributed Management Architecture” on page 35.
1.2.3 8260 Model 010
The 8260 Model 010 is a 10-slot intelligent hub that shares many of the advanced
features of the 8260 Model 017. It differs from the Model 017 in the following
areas:
•
It offers 10 payload slots, rather than 17.
•
It allows up to three power supplies, rather than four. The basic 8260 Model
010 is shipped with a single power supply, and up to two additional power
supplies can be added later. The same power supplies are used on both
models.
Chapter 1. An Overview of the IBM 8260 Hub 7