Nortel 1000 Installation And Commissioning Manual page 63

Trunk Port Disable LEDs
Two red LEDs indicate if the "trunk port 0" and "trunk port 1" portion of the
card are disabled. These LEDs are turned on in the following cases:
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ACT LEDs
Two green LEDs indicate if the "trunk port 0" and "trunk port 1" portion
of the card is active.
RED LEDs
Two red LEDs indicate if the near end detects absence of incoming signal
or loss of synchronization in "trunk port 0" or "trunk port 1" respectively.
The Near End Alarm causes a Far End Alarm signal to be transmitted to
the far end.
YEL LEDs
Two yellow LEDs indicate if a Far End Alarm has been reported by the far
end (usually in response to a Near End Alarm condition at the far end)
on "trunk port 0" or "trunk port 1".
LBK LEDs
Two green LEDs indicate the remote loopback test is being performed on
trunk port 0 or trunk port 1. The loopback indication is active when the
digital trunk is in remote loopback mode (T1 signals received from the far
end are regenerated and transmitted to the far end.) Normal call processing
is inhibited during remote loopback test.
DCH LED
A dual color red/green LED indicates that the onboard DDCH is present
but disabled (red), or is present and enabled (green). If a DDCH is not
configured on the DDP card, this lamp is not lit.
Port 0 Clk Connectors
Two RJ11 connectors for connecting:
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Copyright © 2003-2007, Nortel Networks
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When the enable/disable switch is in state disable (lit by hardware).
After power-up, before the card is enabled.
When digital trunk interface on the card is deactivated by software.
Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 0.
Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 1.
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
NT5D12 Dual-port DTI/PRI 63