Cisco ONS 15454 SDH Specifications download pdf (Page 161)

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Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Chapter 3 Node Setup

Setting Up ONS 15454 SDH Timing

• Framing—Choose the framing used by your BITS reference, either unframed, FAS, FAS + CAS,

FAS + CRC, or FAS + CAS + CRC. If you selected 2.048 MHz, or 64 KHz, the framing option is

disabled.

• Sync Messaging—Select the checkbox to enable synchronization status message (SSM). SSM is

used to deliver clock quality. The SSM supported in SDH is G811, STU, G812T, G812L, SETS,

DUS (ordered from high quality to low quality). If you selected 2.048 MHz, or 64 KHz, the SSM

option is disabled.

• 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 connector. When a node times at or below the AIS Threshold

quality, an AIS is sent. (The AIS Threshold is used when Sync. Messaging is disabled or framing is

set to unframed, FAS, or FAS + CAS.)

• LBO—Choose a BITS cable length. Line build out (LBO) relates to the BITS cable length.

• Sa bit—Choose one of 5 Sa bits (Sa4, Sa5, Sa6, Sa7, and Sa8). The Sa bit transmits the SSM

message. If you selected 2.048 MHz or 64 KHz, the Sa bit option is disabled.

Step 4 Under Reference Lists, complete the following information:

Figure 3-15 Reference list on the ONS 15454 SDH timing tab

Note Reference lists define up to three timing references for the node and up to six BITS Out

references. BITS Out references define the timing references used by equipment attached to

the node’s MIC-C/T/P FMEC Timing A and Timing B Out connector. If you attach

equipment to the Timing A or B Out connector, you normally attach it to a node with Line

mode because equipment near the External timing reference can be directly wired to the

reference.

• NE Reference—Allows you to define three timing references (Ref 1, Ref 2, Ref 3). The node uses

Reference 1 unless a failure occurs to that reference, in which case, the node uses Reference 2. If

Reference 2 fails, the node uses Reference 3, which is typically set to Internal Clock. The internal

clock is the Stratum 3 clock provided on the TCC-I. The options displayed depend on the Timing

Mode setting.

–

Timing Mode set to External—Your options are BITS1, BITS2, and Internal Clock.

–

Timing Mode set to Line—Your options are the node’s working optical cards and Internal

Clock. Select the cards/ports that are directly or indirectly connected to the node wired to the

BITS source, that is, select the node’s trunk cards. Set Reference 1 to the trunk card that is

closest to the BITS source. For example, if Slot 5 is connected to the node wired to the BITS

source, select Slot 5 as Reference 1.

71358

Timing tab

Scroll down to see

remaining optionsProvisioning tab

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 503 504

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