User`s guide

CHAPTER 5: TROUBLESHOOTING

5-4 SEH USER’S GUIDE

MGMT (Green Flashing)

This LED ﬂashes when an intelligent hub manages the SEH. If this LED

does not ﬂash, an intelligent hub is not managing the SEH. If an

intelligent hub is connected to the SEH and the LED does not ﬂash,

inspect the HubSTACK Interconnect cables for proper connections.

CLN (Red)

This LED indicates that a collision has occurred on one of the ports.

RCV (Yellow Flashing)

When this LED ﬂashes, it indicates that the SEH is receiving data packets

from the associated port segment. Each SEH port has a corresponding

RCV LED:

• Network Ports: RCV LEDs 1-24

• EPIM-1: RCV LED E1

• EPIM-2: RCV LED E2

LNK (Green)

When a LNK LED is on, it indicates an established link between the

associated port segment and the device at the other end of the segment.

LNK LEDs remain on as long as a link is maintained. Each SEH Network

Port (ports 1-22 on the SEH-22 and ports 1-24 on the SEH-24) has a

corresponding LNK LED.

SEH Book Page 4 Tuesday, March 19, 1996 4:12 PM