Black Box G.703 NTU w/V35, Manual

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G.703 NTU W/V35
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4. Operation
When the MT331A has been properly configured and installed, it should operate
transparently. This sections describes power-up, LED status monitors, and the
built-in loopback test modes.
4.7 Power-up
Before applying power to the MT331A, refer to section 3.6, “Power connec-
tion” on page 11 and ensure that the unit is properly connected to the appropri-
ate power source.
4.8 LED status monitors
The MT331A features six front panel LEDs that monitor connections on the
G.703 and signaling, error and test modes.
Figure 5 shows the front panel loca-
tion of each LED. Descriptions of each LED follow Figure 5.
Figure 5. MT331A Front panel
E1
Link
(Active Green) Solid green (On) indicates that the end to end E1 Link is
up, signifying that the link is active. The E1 Link LED is Off when the link
is down.
TD &
RD
Glows yellow to indicate an idle condition of Binary “1” data on the
respective terminal interface signals. Green indicates Binary “0” data.
TM (Active Yellow) Solid Yellow indicates an Active Test Mode. The unit may
be placed in test mode by the local user.
E1 Link
TD
RD
TM
E1 Link
TD
RD
TM
G.703 NTU w/V35