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Cisco ONS 15454 SDH Product Overview
Timing
46
Cisco ONS 15454 SDH Product Overview, R3.4
September 2002
can provision any of the clock inputs as a primary, secondary, or tertiary timing
source. If you identify more than one timing reference, the additional references
provide protection. A slow-reference tracking loop allows the TCC-I to
synchronize to the recovered clock, which provides holdover if the reference is
lost.
Timing Parameters
You must set the SDH timing parameters for each ONS 15454 SDH. ONS 15454
SDH timing is set to one of three modes: external, line, or mixed.
Each ONS 15454 SDH independently accepts its timing reference from one of
three sources: the timing connectors on the MIC-C/T/P FMEC, an STM-N card
that receives timing through a BITS source, or the internal Stratum 3E clock on
the TCC-I card.
Note CTC software refers to Timing A and Timing B as BITS 1 and BITS
2.
If timing is coming from the MIC-C/T/P FMEC timing connector, set ONS 15454
SDH timing to external. If the timing comes from an STM-N card, set the timing
to line. An externally timed node derives its timing from a BITS source connected
to the Timing A and Timing B connectors on the MIC-C/T/P FMEC. The BITS
source, in turn, derives its timing from a primary reference source (PRS) such as
a Stratum 1 clock or global positioning satellite (GPS) signal. A line-timed node
derives its timing from an incoming optical signal on one of the STM-N cards.
Figure 25 on page 47 shows an example of an ONS 15454 SDH network-timing
setup. Node 1 is set to external timing. Two references are set to BITS, and the third
reference is set to internal. The Timing Out B connector on the FMEC of Node 3
provides timing to outside equipment, such as a digital access line access multiplexer.
- Figure 1 Cisco ONS 15454 SDH 1
- Card Slots and Types 2
- TCC-I Card 3
- In-Service Software Upgrade 4
- Database Revert 4
- XC10G Card 5
- AIC-I Card 6
- INPUT/OUTPUT 7
- User-Defined Alarms 8
- Orderwire 8
- User Data Channel 8
- Data Communication Channel 9
- DS1/E1 FMEC 10
- E3/DS3 FMEC 10
- Electrical Cards 11
- ACT/STBY 12
- E1-N-14 Card 13
- E3-12 Card 13
- DS-3i Card 13
- Optical Cards 14
- STM-1 SH Card 15
- STM-4 SH Card 16
- STM4-4 SH Card 16
- STM-4 LH Card 16
- STM-4 LH 1550 Card 16
- STM-16 SH AS 1310 Card 16
- Ethernet Cards 17
- E100T-G Card 18
- E1000-2-G Card 18
- G1000-4 Card 18
- Card Protection 19
- Electrical Protection 20
- Optical Protection 20
- Protection Switching 20
- Cisco Transport Controller 21
- September 2002 22
- Security 23
- Customized Network View 24
- Edit, Show Detailed Map 26
- Login Options 27
- System Maintenance 28
- In-Service Span Upgrades 29
- Alarm Collection and Display 30
- CTC Display 31
- History tab Node view 31
- Alarm Profiles 32
- Alarm Suppression 32
- Ethernet 33
- Network Management 36
- Open Shortest Path First 37
- Proxy Server Feature 37
- Routing Information Protocol 38
- Static Route Provisioning 38
- DCC Tunneling 38
- Network Configuration 39
- Extended SNCP Mesh Network 43
- Timing Parameters 46
- Hardware 48
- Fan-Tray Assembly 49
- Shelf Assembly Specifications 50
- Configurations 52
- External LAN Interface 53
- Modem Interface 53
- Alarm Interface 53
- Database Storage 53
- Timing Interface 54
- System Timing 54
- Power Specifications 54
- Environmental Specifications 54
- Dimensions 55
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