Item
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Description
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BITS In
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Fields in this group provision the BITS In parameters.
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Facility Type
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Provisions the BITS facility type (E1 or 2 Mhz).
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BITS In State
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Provisions the BITS In state to unlocked or locked. If Timing Mode is set to External or Mixed, set the BITS In State for BITS-1 and/or BITS-2 to unlocked, depending on whether one or both BITS input pin pairs on the MIC-C/T/P are connected to the external timing source. If Timing Mode is set to Line, set the BITS In State to locked.
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Coding
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The coding used by your BITS In reference, either HDB3 or AMI (alternate mark inversion). If you selected 2 MHz, the coding option is disabled.
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Framing
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The framing used by your BITS In reference (unframed, FAS, FAS+CAS, FAS+CRC, FAX+CAS+CRC). If you selected 2 MHz, the framing option is disabled.
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Sync Messaging
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If checked, enables the Synchronization Status Message (SSM) for BITS In. (SSM is not available if Framing is set to unframed, FAS, or FAS+CAS.)
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Admin SSM
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If the Sync Messaging check box is not checked, you can choose the SSM from the drop-down list.
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Sa Bit
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The Sa bit transmits the SSM message. If you selected 2 MHz, the Sa bit option is disabled.
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BITS Out
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Fields in this group provision the BITS Out parameters.
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Facility Type
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Provisions the BITS Out facility type (E1 or 2 Mhz).
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BITS State (BITS Out State)
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Provisions the BITS Out state to unlocked or locked. If Timing Mode is set to External or Mixed, set the BITS Out State for BITS-1 and/or BITS-2 to unlocked, depending on whether one or both BITS input pin pairs on the MIC-C/T/P are connected to the external timing source. If Timing Mode is set to Line, set the BITS Out State to locked.
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Coding
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The coding used by your BITS Out reference, either HDB3 or AMI.
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Framing
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The framing used by your BITS Out reference (unframed, FAS, FAS+CAS, FAS+CRC, FAX+CAS+CRC).
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AIS Threshold
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The AIS threshold is used when SSM is disabled or framing is set to unframed, FAS, or FAS + CAS. The AIS threshold sets the quality level at which a node sends an alarm indication signal (AIS) from the BITS-1 Out and BITS-2 Out FMEC connectors. When a node times at or below the AIS threshold quality, an AIS is raised.
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Sa Bit
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The Sa bit transmits the SSM message. If you selected 2 MHz, the Sa bit option is disabled.
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Apply
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Applies changes to the Timing > BITS Facilities subtab.
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Reset
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Cancels Timing > BITS Facilities subtab changes and returns the fields to their last-saved settings.
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Help
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Displays context-sensitive help.
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