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2-WIRE SHORT-RANGE DSL LINE DRIVER (HDSL) WITH 10BASE-T
6. Operation
When the HDSL Line Driver has been properly configured and installed, it should
operate transparently. This chapter describes power-up, LED status indicators, and
the built-in loopback test modes.
6.1 Power-Up
Before applying power to the HDSL Line Driver, please read
Section 5.4
and make
sure that the unit will be connected to the appropriate power source.
6.2 LED Status Indicators
The HDSL Line Driver features six front-panel LEDs that monitor connections on
the DSL and 10BASE-T links, signaling, error, and test modes. Figure 6-1 shows the
location of each LED. Descriptions of each LED follow Figure 6-1.
Figure 6-1. Front panel.
• DSL Link: (active green) Solid green (On) indicates that the end-to-end DSL
framer link is up, signifying that the link across the DSL span is active. The
DSL Link LED is Off when the link is down.
• Status: Blinks yellow from one to eleven times to indicate system status. Each
pulse pattern is separated by a 2-second “off” period. Greater pulse patterns
have higher priority (buffer saturation has greater priority than an empty MAC
table). Valid system statuses are:
1 pulse =
system status is okay
2 pulses =
no MAC entries in the MAC Address Table
