1588_1

Raltron Frequency Components As Mentioned in Microsemi Application Note ZLAN-442


Physical Layer Synchronization (click for details)

Oscillators For Physical Layer Synchronization

CLASSIFICATION

Below list is a summary of the various classifications of oscillator for use in physical layer synchronization and protocol layer synchronization. Some classifications represent the superset requirements of closely related clocks (where an individual clock requirement may be less than that listed for the superset).
Oscillator ClassA1A2C2DE
Superset GroupingStratum 3, SMC & Option 2
(PDH, SONET, SyncE)
Option 1
(SDH, SyncE)
Line Card
Telcordia ClockN/AStratum 3EStratum 3 for SONETN/AStratum 4
ITU-T ClockType IType IIIG.813 Option 2,
G.8262 Option 2
G.813 Option 1,
G.8262 Option 2
PLL implied Bandwidth3mHz1mHz0.1Hz1Hz14Hz
Free-run Accuracy (ppm)N/A± 4.6± 4.6± 4.6± 32
Frequency Stability (pk-pk) at Variable Temperature (ppb)2102802000N/A
Frequency Stability at Constant Temperature (ppb)± 0.2± 1± 40± 10N/A
Wander Generation (MTIE, TDEV)Refer to standardRefer to standardRefer to standardRefer to standardRefer to standard
CLASS A2

Used with 1 mHz filterbandwith for complience with T1-based Stratum 3E & ITU-T G.812 Type III specifications. Note these oscillators may NOT be compliant with class A1, used for 3 mHz filter bandwidth E1-based ITU-t G.812 Type I (SSU) requirements
OCXOs for CLASS A2

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.325.4 x 25.4OX2180A-D3-0.8-20.000-3.3-SMD
24.5763.325.4 x 25.4OX2180A-D3-0.8-24.576-3.3
24.5763.325.4 x 22.0OX2150A-D3-0.6-24.576-3.3
CLASS C2

Used with 0.1 Hz and higher filter bandwidths for compliance with T1-based hierarchy specifications such as ITU-T G.813 option2 SEC, ITU_T G.8262 option2 EEC, stratum 3 for SONET, Stratum 3 & SMC. Note these oscillators may NOT be compliance with Class D requirements for E1-Based hierarchy specifications such as ITU-T G.813 option 1 SEC and ITU-T G.8262 option 2 EEC (specifically frequency stability at constant temperature)
OCXOs for CLASS C2

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.314.6 x 9.7OX2014A-D3-2-20.000-3.3
24.5763.314.6 x 9.7OX2114A-HZ-1-24.576-3.3
49.1523.314.6 x 9.7OX2014A-LZ-1-49.152-3.3
TCXOs for CLASS C2

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.37.0 x 5.0TX257A-D3-0.28-20.000-3-TR
24.5763.37.0 x 5.0TX257A-D3-0.28-24.576-3-TR
49.1523.37.0 x 5.0TX257A-D3-0.28-49.152-3-TR
CLASS D

Used with 1 Hz and higher filter bandwidths for compliance with E1-based hierarchy specifications such as ITU-T G.813 option 1EEC
OCXOs for CLASS D

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.314.6 x 9.7OX2014A-D3-2-20.000-3.3
24.5763.314.6 x 9.7OX2114A-HZ-1-24.576-3.3
49.1523.314.6 x 9.7OX2014A-LZ-1-49.152-3.3
TCXOs for CLASS D

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.37.0 x 5.0TX257A-D3-0.28-20.000-3-TR
24.5763.37.0 x 5.0TX257A-D3-0.28-24.576-3-TR
49.1523.37.0 x 5.0TX257A-D3-0.28-49.152-3-TR
CLASS E

Used with 14 Hz and higher filter bandwidths for T1-based,E1-based and OTN line card use cases.Also listed are oscillators/crystals for Clock Synthesis applications
CLOCK OSCILLATORS for CLASS E

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.37.0 x 5.0CO43025-20.000-EXT-TR
24.5763.37.0 x 5.0CO43025-24.576-EXT-TR
49.1523.37.0 x 5.0CO43025-49.152-TR
50.0003.37.0 x 5.0CO46025-50.000-TR
CRYSTALS for CLASS E

Crystal FrequencyCrystal Supply VoltageCrystal SizeRALTRON Part Number
MHzVmm
20.000N/A3.2 x 2.5RH100-20.000-18-1030-TR
24.576N/A3.2 x 2.5RH100-24.576-18-F-2050-TR
49.152N/A3.2 x 2.5RH100-49.152-18-F-2050-TR
50.000N/A3.2 x 2.5RH100-50.000-18-F-2050-TR
Protocol Layer Synchronization (click for details)

Oscillators For Protocol Layer Synchronization

CLASSIFICATION

Below list is a summary of the various classifications of oscillator for use in physical layer synchronization and protocol layer synchronization. Some classifications represent the superset requirements of closely related clocks (where an individual clock requirement may be less than that listed for the superset).
Oscillator ClassA2BC1D1

Superset Grouping

Unaware Networks
Partially Aware Networks
T-BC-P,T-TSC-P,APTSC or
Unware Networkss OC
Fully Aware Networks
T-BC,T-TSC
Fully Aware Networks,
combined with SyncE,
T-BC,T-TSC
(Note 2)
ITU-T ClockG.8263
(Note 1)
G.8273.2,G.8273.4
(Note 1)
G.8273.2
(Note 1)
G.8273.2
(Note 1)
Non-standardized networks profilesG.8261 Appendix VIG.8261 Appendix VI
PLL implied Bandwidth1mHz3mHz0.05Hz
(TBD 0.08Hz
max 0.1Hz)
1Hz
(TBD 0.8Hz
max 10Hz)
Free-run Accuracy (ppm)±4.6±4.6±4.6±4.6
Frequency Stability (pk-pk) at Variable Temperature (ppb)5(reduced temp range)
10(full temp range)
TBD
(100)
TBD
(200)
TBD
(2000)
Frequency Stability at Constant Temperature (ppb)±1±2±10±10
Wander Generation (MTIE, TDEV)Refer to Stratum 3E standardUse stratum 3E standard,
but at PLL implied bandwidth
(Note 3)
Refer to standard
(Note 3)
Refer to standard
(Note 3)
Note 1:Specifications under revision, under draft or no yet reached draft.
Note 2: Oscillator must comply with both class D1 (G.8273.2) and class D2 (G.8262 option 1 EEC).
Note 3: When measurement is performance on a PTP output there is up to 8 ns of additional timestamp noise. Therefore clearance/margin of 8 ns or 25% (whichever is larger) against the wander generation MTIE & TDEV masks may be requested.
CLASS B

Used for partially aware networks with phase synchronization, such as T-BC-P, T-TSC-P and APTSC clocks. Used for unaware aware networks with relaxed frequency synchronization requirements, based on ITU-T G.8261 Appendix VI profiles.
OCXOs for CLASS B

Oscillator FrequencyOscillator Supply VoltageOscillator SizeRALTRON Part Number
MHzVmm
20.0003.314.6 x 9.7OX2114B-D3-2-20.000-3.3
24.5763.314.6 x 9.7OX2114B-D3-2-24.576-3.3