Nortel QMT12 ADM, Руководство пользователя

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Page 44 of 80 Equipment description
553-2731-100 Standard 5.00 April 2000
Asynchronous Card
The 4-port MCDS-AC is located in the MCDS cabinet and supports four
computer ports (or any other device that requires answer only). It provides the
drivers and receivers required to meet the electrical interface specifications of
the RS-232-C EIA standard. The MCDS-AC provides the same functions as
four stand-alone ADMs.
The controls and indicators located on the circuit pack are described in
Table 3.
Table 3
MCDS indicators and switches
Indicator Description
CONN The CONN LED is located on the MCDS-AC. It lights
when a call is connected from the Meridian 1 through
the card to the attached device.
DTR The DTR LED is located on the MCDS-AC. It lights to
indicate that DTR is received from the attached device
or forced ON at the MCDS-AC.
RD The RD LED is located on the MCDS-AC. It lights
when data is received by the card.
SD The SD LED is located on the MCDS-AC. It lights
when data is transmitted by the card to the far end.
POWER The POWER LED is located on the front panel of the
MCDS power supply. It lights when the ON—OFF
switch is operated to ON
ON—OFF The POWER switch is located on the front panel of the
MCDS power supply. It is used to turn the power
supply on or off. The switch should be OFF when
inserting or removing the supply from the shelf.
Voltage Test
Points The VOLTAGE TEST POINTS are jacks that are
located on the front panel of the power supply. They
provide test points to verify the + 5, + 12, + 9, and –9 V
that are supplied by an energized power supply.
PORTS The port designations, located on the front panel of the
power supply, provide legends for the MCDS-AC
located in the right half of the shelf.