BITS Facilities
Use the Timing > BITS Facilities subtab to provision the BITS In and BITS Out parameters.
Item
Description
BITS In area
Facility Type
Provisions the BITS In facility type (DS1 or 64Khz+8 Khz).
BITS In State
Provisions the BITS In state to In-Service (IS) or Out-of-Service (OOS).
If Timing Mode is set to External or Mixed, set the BITS In State for BITS-1 and/or BITS-2 to IS, depending on whether one or both BITS input pin pairs on the backplane are connected to the external timing source. If Timing Mode is set to Line, set the BITS In State to OOS.
Coding
Sets the coding used by your BITS In reference, either B8ZS or AMI.
Framing
Sets the framing used by your BITS In reference, either Extended Super Frame (ESF), or Super Frame (SF) (D4).
Sync Messaging
If checked, enables the SSM for BITS In. (SSM is not available if Framing is set to Super Frame.)
Admin SSM
(ONS 15454 only) If the Sync Messaging check box is not checked, you can choose the SSM Generation 2 type from the drop-down list.
BITS Out area
Facility Type
Provisions the BITS Out facility type (DS1 or 6 Mhz).
BITS Out State
Provisions the BITS Out state to IS or OOS.
If equipment is connected to the node’s BITS output pins on the backplane and you want to time the equipment from a node reference, set the BITS Out State for BITS-1 and/or BITS-2 to IS, depending on which BITS Out pins are used for the external equipment. If equipment is not attached to the BITS output pins, set the BITS Out State to OOS.
Coding
Sets the coding used by your BITS Out reference, either B8ZS or AMI.
Framing
Sets the framing used by your BITS Out reference, either ESF or SF (D4).
AIS Threshold
If SSM is disabled or Super Frame is used, sets the quality level where a node sends an alarm indication signal (AIS) from the BITS-1 Out and BITS-2 Out backplane pins. An AIS is raised when the optical source for the BITS reference falls to or below the SSM quality level defined in this field. Options are PRS, STU, ST2, ST3, SMC, ST4, DUS, and RES.
LBO
When timing external equipment connected to the BITS Out pins, sets the distance between the device and the ONS node. Options are 0 to 133 ft. (default), 134 to 266 ft., 267 to 399 ft., 400 to 533 ft., and 534 to 655 ft.
Apply
Applies changes to the Timing > BITS Facilities subtab.
Reset
Cancels Timing > BITS Facilities subtab changes and returns the fields to their last-saved settings.
Help
Displays context-sensitive help.

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