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FRONT PANEL CONNECTIONS &
INDICATORS
All connections (except power) to the
DL221/DL221A
are made at
the front panel. Below is a picture of a
DL221
Front Panel. The
DL221A
is identical, except that the duplex fiber connector is
replaced with a single fiber connector. Please familiarize yourself
with the front panel before attempting to configure the transceiver.
1. Straight/Crossover selector (MDI-II/MDI-X)
2. 10/100BaseTX Connector
3. Twisted Pair Status LEDs
LINK twisted pair link present
RCV receive data on twisted pair port
100TX Twisted pair is working at 100Mps (off = 10Mps)
FDX Full duplex operation (off = half duplex)
4. Mode Select Switches
5. 100BaseFX (fiber optic) Status LEDs
LINK fiber optic link present
RCV receive data on fiber optic port
FDX Full duplex operation (off = half duplex)
6. Optical Connectors. Typically SC connectors
(other options are available).
DL221 TX on left, RX on right
DL221A TX and RX combined onto one fiber
7. Power LED
Front Panel View
1
2
3
4
6
5
7
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FDX LED not lit
FDX LED lit
Link LED
(100BaseFx) not
lit
The DL221 full duplex
is not working when the
DL221 is connected to
the full duplex without
NWAY capability
(copper side)
The DL221 half duplex
is not working when the
DL221 is connected to
the NWAY capability
(copper side).
Fiber link not working
On the setup mode switches,
check that S1 is UP and S3 is
DOWN.
On the setup mode switches,
move S6 to the DOWN position,
and move it back to the UP
position after one second.
On the setup mode switches,
check that the S1 is DOWN OR
S1 is UP and S3 is UP.
On the mode setup switches,
move S6 to the DOWN position,
and move it back to the UP
position after one second.
Check that the connected device
is half duplex only.
Check the interconnection
between the DL221 and the
device.
Check that the receive fiber is
properly connected to the
transmit port of the remote fiber
device and the transmit port to
the receive port of the remote
device.
Check that the fiber optic power
is higher than -30 dbm on the
receive fiber connector at the
DL221 end (-26dBm for DL221A)
Check the remote devices
receive port is properly con-
nected to the transmit fiber optic
port of the DL221.
Problem
Indication
Corrective Action
