Instruction manual

Quick Reference Information
1-14 893-839-C
For information about power specifications for the −48 V DC hubs, refer to
Appendix A, “Technical Specifications.”
7 Redundant Power Connector
The 16-pin redundant power connector allows you to connect a redundant
power supply unit (RPSU) to the hub. An RPSU can be attached without
affecting connectivity to the stack.
8 Reset Button
The Reset button provides an easy way to reset the hub configuration without
disconnecting the power cord. You can reset the hub in one of two ways:
• If you press and quickly release the Reset button, the hub resets to its
existing configured parameters. The LEDs momentarily flash amber, then
green, then the correct color.
• If you hold the Reset button down for 10 seconds, the hub resets to its
original factory default settings. The LEDs momentarily flash amber, then
green three times, then the correct diagnostic color.
Pressing the Reset button momentarily interrupts the flow of network data. For
more information about hub configuration after a reset, see “Automatic Hub
Configuration” on page 4-1.
9 Segment Select Switch
The Segment Select switch (see Figure 1-9) allows you to assign the hub ports
to any segment in the cascade or to isolate the hub from the cascade. If you
move the switch, the new setting takes effect immediately.
WARNING: When connecting or removing power to a −48 V DC hub, refer to
Appendix B, “Connecting to a –48 V DC Power Source” for important safety
and configuration information you must know before adding a −48 V DC hub
to your network.
893-839-CBook Page 14 Thursday, December 12, 1996 4:18 PM