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Configurations
Before the 3708 can communicate with an SNA host, the 3708 must
be
configured to
match the network. Although the 3708 operates using only one configuration, there
can
be
as many as four different configurations in the 3708 at any time. These are:
• The IBM-supplied configuration
• The customer-defined configuration
• The operational configuration
• The update configuration.
IBM-Supplied Configuration
The IBM-supplied configuration is provided to allow initial connection to the 3708.
When the 3708 is first installed, the user must connect a control terminal to the 3708
and create the customer-defined configuration. Refer to IBM 3708 Network
Conversion Unit Planning and Installation, GA27-3766, for installation procedures
and a description of the IBM-supplied configuration.
The IBM-supplied configuration allows initial access to the 3708 through one of the
ports numbered 2 through 9. Each of the ports is defined differently in the
IBM-supplied configuraton. Ports 3 and 7 are the most widely used because they
represent two major types of connection, switched and nonswitched, respectively.
After the customer-defined configuration is created, the IBM-supplied configuration
may never need to be used again. The only time it may be needed is to allow IBM
service personnel to perform remote diagnostic service (refer to IBM 3708 Network
Conversion Unit Planning and Installation, GA27-3766, and IBM 3708 Network
Conversion Unit Problem Determination, GA27-3768, for information about remote
service).
The IBM-supplied configuration resides in the cartridge (EPROM).
Customer-Defined Configuration
The customer-defined configuration can be entered into the 3708 through the control
terminal. This configuration resides in the base (EEPROM). This configuration is
not lost when the 3708 is powered off, power is lost, or a different cartridge is
inserted.
Operational Configuration
The operational configuration is either the customer-defined configuration or the
IBM-supplied configuration. Figure 2-1 on page 2-6 shows which configuration
becomes the operational configuration.
When the power is turned on, the customer-defined configuration is copied from
EEPROM into RAM unless the test/normal switch is pressed within a 5 second
window. The window begins when both LEDs go out (approximately 5% seconds
after power on), and it lasts for 5 seconds. Refer to "Normal Power On and Restart
Light Sequence" on page 2-2. If the test/normal sWitch is pressed, the IBM-supplied
configuration is copied into RAM and becomes the operational configuration.
Chapter 2. 3708 Operation
2-5
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