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GBICs
Each IBM NAS 300 Fibre Channel hub accommodates one short-wavelength (SWL)
GBIC module. The SWL fiber optic GBIC module, with SC connector color-coded
black, is based on short-wavelength lasers supporting 1.0625 GB per second link
speeds. This GBIC module supports 50-micron multimode fiber optic cables (up to
500 meters in length) and 62.5-micron multimode fiber optic cables (up to 175
meters in length). The GBIC module is shipped with a protective plug in place and
should remain in place if no fiber optic cable is connected to the port.
Serial port connection
The Fibre Channel hub includes a serial port, which is used to set the IP address
when setting up, reinitializing the Fibre Channel hub, or running diagnostics. The
serial port connection is not used during normal operation.
The settings of the serial port are as follows:
v 8-bit
v No parity
v One stop bit
v 9600 baud
v Flow Control = None
v Emulation = Auto Detect
Note: The serial port and Telnet connection are mutually exclusive. There can be
Ethernet connection
The Ethernet port allows you to connecting the Fibre Channel hub to an existing
10/100BaseT Ethernet local area network (LAN). This Ethernet port provides the
following functions:
v Provides access to the Fibre Channel hub's internal SNMP agent
v Permits remote Telnet and Web access for remote monitoring and testing
v Permits the setting or changing of the IP address
Note: The Ethernet port is only for Telnet, SNMP agent, and the Web-based server
RAID storage controller
The IBM NAS 300 RAID storage controller comes with two RAID controllers, two
power supplies, and two cooling units, and provides dual, redundant controllers,
redundant cooling, redundant power, and battery backup of the RAID controller
cache.
The IBM NAS 300 RAID storage controller supports Fibre Channel. It is a new
technology, similar to a high-speed network, that you can use to connect large
amounts of disk storage to a controller or cluster of controllers. Fibre Channel
technology provides increased performance, scalability, availability, and distance for
only one serial port session active at a time. Telnet takes priority, so the
serial port is terminated when a Telnet connection is made. The serial
connection is restored after the Telnet session is completed. Logging in
again is required. A password is required to login to the serial port session
as password checking is skipped only at initial power on.
access. No fabric connection is used with this connection.
5
Chapter 2. Introduction
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Troubleshooting
