9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-15-43
System/Controls
The System/Controls screen presents Node and Terminal diagnostic menus for
LINK (RAC/Radio), DATA (DAC/Trib), and AUX modules.
Information is provided on:
• Link Menu on page 15-43
• Ring Menu on page 15-52
• DAC/Tributary Menu on page 15-56
•
• AUX Menu on page 15-65
• Loopback Points on page 15-65
Link Menu
For a 1+0 non-protected link the screen options are:
• Tx Mute: Mutes the ODU transmitter.
• Digital Loopback: Applies a bus facing digital loopback.
IF Loopback: Applies a bus facing IF loopback.
For Tx Mute and Loopback operation refer to Link Menu Operation on
page 15-48
For information on where loopbacks are applied in the equipment, refer to
Figure 15-25 on page 15-66.
For a 1+1 protected link the screen options include:
• An indication of which Tx and Rx is online.
• Controls to lock a Tx and/or Rx online.
• An ability to switch to an online secondary from primary, and vice-versa. This
has application in the event a failed RAC/Terminal is restored to service. For
instance, if the primary designated RAC has failed (or is withdrawn), it is not
auto-restored to online transmit, on repair or replacement.
Applying an IF loopback on a RAC 40 causes the opposite polarity RAC 40 to
lose sync (removes the XPIC interferer sample necessary for normal XPIC
operation).
For information of auto insertion of AIS/PRBS under a demodulator unlock or
loopback options, refer to Auto Insertion of AIS or PRBS on Tribs on page 15-59.
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