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2-WIRE SHORT-RANGE DSL LINE DRIVER (MDSL)
6. Operation
When the mDSL Line Driver has been properly configured and installed, it should
operate transparently. This section describes power-up, LED status monitors, and
the built-in loopback test modes.
6.1 Power-Up
Before applying power to the Line Driver, please read
Section 5.4
and make sure
that the unit is connected to the appropriate power source.
6.2 LED Status Indicators
The mDSL 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 of the Line Driver.
• 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
3 pulses =
Clear to Send (CTS) or Carrier Detect (DCD) from base
unit are not asserted
DSL
10BT
Status
NS
ER
TM
