17-77
Cisco ONS 15454 Procedure Guide, R5.0
March 2005
Chapter 17 DLPs A1 to A99
DLP-A70 Set Up Internal Timing
Step 6 If BITS In State is set to OOS, continue with Step 7. If the BITS In State is set to IS, complete the
following information:
• Coding—Choose the coding used by your BITS reference, either B8ZS (binary 8-zero substitution)
or AMI (alternate mark inversion).
• Framing—Choose the framing used by your BITS reference, either ESF (Extended Super Frame) or
SF (D4) (Super Frame).
• Sync Messaging—Check this check box to enable SSM. SSM is not available if Framing is set to
Super Frame.
• Admin SSM—If the Sync Messaging check box is not checked, you can choose the SSM
Generation 2 type from the drop-down list.
Step 7 In the BITS Out area, complete the following information, as needed:
• Facility Type—choose the BITS Out signal type, either DS1 or 64 Khz.
• BITS Out State—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.
Step 8 If the BITS Out State is set to OOS, continue with Step 9. If BITS Out State is set to IS, complete the
following information:
• Coding—Choose the coding used by your BITS reference, either B8ZS or AMI.
• Framing—Choose the framing used by your BITS reference, either ESF or SF (D4).
• AIS Threshold—If SSM is disabled or Super Frame is used, choose the quality level where a node
sends an AIS from the BITS 1 Out and BITS 2 Out backplane pins. An AIS alarm is raised when the
optical source for the BITS reference falls to or below the SSM quality level defined in this field.
• LBO—If you are timing an external device connected to the BITS Out pins, choose the distance
between the device and the ONS 15327. Options are: 0-133 ft. (default), 124-266 ft., 267-399 ft.,
400-533 ft., and 534-655 ft. Line build out (LBO) relates to the BITS cable length.
Step 9 Click Apply.
Note Refer to the Cisco ONS 15454 Troubleshooting Guide for timing-related alarms.
Step 10 Return to your originating procedure (NTP).
DLP-A70 Set Up Internal Timing
Purpose This task sets up internal timing (Stratum 3) for an ONS 15454.
Tools/Equipment None
Prerequisite Procedures DLP-A60 Log into CTC, page 17-66
Required/As Needed As needed (use only if a BITS source is not available)
Onsite/Remote Onsite or remote
Security Level Provisioning or higher
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