Nortel DMS-100 Series Maintenance Manual page 52

2-32 Star Remote System hardware
Each of the components shown in the previous figure are described here.
ISDN Drawer Controller card (NT6X54DA)
The IDC is at the front of the ILD-R, behind the front faceplate. The IDC
supports up to 28 ISDN loops and
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Communication between the line drawers, or between two LSGs, is completed
through the single IDC in each drawer. If one of the RCP cards fail, the activity
is moved to the other RCP card. The IDC communicates with the C-side
through a single RCP card.
The IDC card has three LEDs on the faceplate of the IDC card to indicate
faults. The three LEDs are
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The following table shows the four states that apply to the ON or OFF
condition of the red and green LEDs on the IDC card.
Table 2-11 Fault and InSv indicator LEDs
State
State 1
State 2
State 3
State 4
297-8353-550 Standard 05.01 March 2001
provides pulse coded modulation (PCM) and data control functionality
exchanges D-channel messages between the ISDN line cards and the rest
of the SuperNode switch
provides the processing engine that does the D-channel routing, line card
maintenance, loop performance monitoring, and local drawer connection
management
green InSv LED (operates by software and indicates the card is in service)
red Fault LED (operates by both software and hardware and indicates a
fault condition)
PUPS OK LED (indicates a +5 V supply problem or a blown fuse)
Green (InSv)
LED
on
on
off
off
Red (Fault)
LED Description
off IDC is active (Do not interrupt
the drawer's activity.)
on Lamp test for 1-2 seconds after
card power-up
on There is a problem in the IDC
card. IDC card can be removed.
off Indeterminate condition, testing
required