3Com 3C63400-3AC-C - PathBuilder S700 Switch Reference Manual page 38

24 C 2: I
HAPTER NSTALLATION
Figure 8 DS3/E3 UNI Module Connection
DS3/E3
CSU or CPE
TX Out
TX In
DS3/E3
Service
TX Out
75 ohm coax
Once you have connected the module, verify the front-panel indicator sequence
illustrated in Figure 9. The DS3 UNI and E3 UNI modules feature the following
front panel indicators in addition to the common system LEDs:
LOS (RED)—Powers up in the "off" state and illuminates when a LOS (Loss of
Signal) condition is detected on the incoming DS3/E3. The LOS LED is off if a signal
is present. It reflects the LOS state of the DS3/E3 in real time (no integration of the
state is needed).
LOF (RED)—Powers up in the "off" state and illuminates when a LOF (Loss of
Frame) condition is detected on the incoming DS3/E3. The LOF LED is off when the
signal is in frame. It reflects the LOF state of the DS3/E3 in real time (no integration
of the state is needed).
LOCD (RED)—Powers up in the "off" state and illuminates when a LOCD (Loss of
Cell Delineation) condition is detected on the incoming DS3/E3 under HEC
(Header Error Control) framing. The LOCD LED is off when delineations are
obtained. It reflects the LOCD state of the DS3/E3 in real time (no integration of
the state is needed).
Slot 1
RX
In
Slot 18