Nortel 1000 Installation And Commissioning Manual page 38

38 ISDN Primary Rate Interface equipment overview
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Trunk Disable (DIS) LEDs
Two red LEDs indicate if the "trunk port 0" or "trunk port 1" portions of the
card are disabled. These LEDs are lit in the following cases:
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OOS LEDs
Two yellow LEDs indicate if the "trunk port 0" and "trunk port 1" portions of
the card are out-of-service.
NEA LEDs
Two yellow 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.
FEA 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 yellow LEDs indicate if a 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. Normal call processing is inhibited
during the remote loopback test.
DCH LED
When the dual colored LED is red, it indicates the onboard DDCH is present
but disabled. When the dual colored LED is green, it indicates the onboard
DDCH is present and enabled. If a DDCH is not configured on the DDP2
card, this lamp is not lit.
Unit 0 Clk Connectors
Two RJ11 connectors for connecting:
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Copyright © 2003-2007, Nortel Networks
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When the ENET port on the card is disabled by software.
upon reception of the "disable loop" message from the software
after power-up
Digital trunk unit 0 recovered clock to primary or secondary reference
source on clock controller card 0.
Digital trunk unit 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