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VIP-4R/4T Installation and Configuration 33
VIP Port Adapter Functions
Token Ring Distance Limitations
The maximum transmission distance is not defined for IEEE 802.5 (Token Ring) networks. Shielded
twisted-pair (STP) cabling is most commonly used for rates of 4 and 16 Mbps. Twisted-pair cabling
is more susceptible to interference than other types of cabling; therefore, the network length and
repeater spacing should be planned accordingly.
Token Ring Speed Considerations
Before you install the 4R port adapter, determine the ring speed (4 or 16 Mbps) of each ring to be
connected to the server. There is no factory default for the interface speed; you must set the speed of
each interface (within the setup command facility or with the ring-speed command) before you
bring the interface up and insert it into the ring with the no shutdown command.
Note If an interface has an undefined or incorrect ring speed and is not shut down, the ring will
beacon. This effectively takes the ring down and makes it inoperable.
4R Port Adapter LEDs
The 4R port adapter’s enabled LED (shown in Figure 16) goes on to indicate the following status of
the 4R port adapter:
• Enabled for operation
• Correctly connected to the VIP card
• Receiving power from the VIP card
• Contains a valid microcode version
If any of these conditions is not met, or if the initialization fails for other reasons, the port adapter’s
enabled LED does not go on.
Figure 16 4R Port Adapter LEDs
When a Token Ring interface is configured by using software commands, two additional LEDs for
each port indicate the following:
• In ring—Goes on when the interface is currently active and inserted into the ring; off when the
interface is not active and is not inserted into a ring.
• 4/16 Mbps—Goes on if the interface is operating at 16 Mbps; off when the interface is operation
at 4 Mbps.
ENABLED
H4489
TOKEN RING
0
1
2
3
IN-RING
4/16 Mbps