Nortel Networks 1750 manual 56/64K CSU/DSU WAN interface card LEDs, Blue LED, Green LED

Chapter 1 Cables and power 31

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

Blue LED Red LED

56/64K

DDS

Green LED Yellow LED

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.

Nortel VPN Router Installation — VPN Router 1750