3Com 3C10111C - NBX 100 - Modular Exp Base Installation Manual page 35

RA — On indicates a Remote Alarm. The far end of the E1 line is
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not receiving appropriate signaling from the E1 board.
LB — On indicates that loop-back testing is going on.
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Nominal — On indicates ready to send and receive information.
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10BASE-T Uplink MDI — This RJ-45 Ethernet connector connects the
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card to an external LAN hub or switch. If the E1 Digital Line Card is
used in an NBX Gateway Chassis, you do not need to use this
connector because the NBX Gateway chassis is connected to the LAN.
If you use the Uplink connection, be sure to program the switch or router
at the other end for 10BASE-T 10 MB operation.
Console — This DB-9 connector provides an RS-232 (DCE) TTY
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terminal connection for maintenance access.
Each 3C10165D E1 Digital Line Card has the following lights and
connectors:
E1 — This RJ-48C connector makes a patch cord connection to a E1
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interface.
Status Lights — These lights indicate the status of the card's
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signaling, synchronization, and loop back test.
CO — Central Office:
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Amber — Alarm condition at the remote end or the CO is not
connected or available.
Green — No alarm condition.
POST — Power On Self Test:
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Off — POST test is running. The test runs approximately 5-seconds
after you apply power to the board. After 5-seconds, Off indicates
the POST test failed.
Green — POST test completed successfully.
DCH — D channel status of an ISDN PRI connection
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Off — No E1 or E1 PRI line is attached.
Green — Card is configured for ISDN PRI operation and an active
PRI connection has been established.
Amber — The D channel has not yet been established. It can take
several seconds after the card has completed its power up tests for
the card to establish a connection with the PRI trunk. If the DCH
Overview of NBX Cards and Devices 35