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Chapter 1 Cables and power 31
Nortel VPN Router Installation — VPN Router 1750
56/64K CSU/DSU WAN interface card LEDs
The following figure shows the LEDs on the 56/64K CSU/DSU WAN interface
card.
Figure 8 LEDs on the 56/64K CSU/DSU WAN interface card
The following figure describes the LEDs on the 56/64K CSU/DSU WAN interface
card.
Table 9 LED indicators on the 56/64K CSU/DSU WAN interface card
LED Description
Blue The blue alarm LED lights after the interface card detects a digital data
service (DDS) out-of-frame condition on the receive signal.
Red The red alarm LED lights after the interface card detects a DDS loss-of-
signal or loss-of-frame condition on the receive signal.
Yellow The yellow alarm LED lights after the interface card detects a DDS
out-of-service condition on the receive signal. This LED indicates that
the far-end equipment detects a local loss of service (LOS) or loss of
frame (LOF) condition.
Green The green LED lights after the interface card receives valid DDS signal
and framing. This LED indicates normal operation of the card.
All LEDs off The port is disabled.
56/64K
DDS
Blue LED
Yellow LED
Red LED
Green LED