3Com 3C10111C - NBX 100 - Modular Exp Base Installation Manual page 32

32 C 1: I
HAPTER NTRODUCTION
The 3C10116D T1 Digital Line Card has the following lights and
connectors:
T1 — This RJ-48C connector makes a patch cord connection to a T1
■
interface.
Status Lights — These lights indicate the status of the T1 card's
■
signaling, synchronization, and loop back test.
CO — Central Office:
■
Amber — Alarm condition at the remote end or the CO is not
connected or available.
Green — No alarm condition.
POST — Power On Self Test
■
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
■
Off — No T1 or T1 PRI line is attached or that the card does not
need a D channel, such as when the card is running T1-robbed-bit
(CAS).
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
light goes to amber after the connection has been established, it
can mean that an active control channel connection through the
PRI line has been lost.
DNLD — Download
■
Flash — The card is downloading software from the NBX Network
Call Processor.
Green — The download is complete or the Power-On-Self-Test
(POST) is running.
Amber — The download was interrupted before it completed.
On a LAN, the download process completes quickly. If the
download from NCP to digital line card must travel a routed