Nortel Communication Server 1000S Installation And Configuration Manual page 80

Page 80 of 394 ISDN Primary Rate Interface equipment overview
553-3001-201 Standard 2.00
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:
• 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.
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 on-board 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.
September 2004