12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 127
Clock Module Reference Data
Stratum 2E Clock Module
Functional Specifications
Table 6-2 lists the specifications for the Stratum 2E Clock module.
Warmup Amber On = Clock module is in warm-up mode
Off = Clock module has completed warmup
Acquire Green On = Clock module is acquiring a lock on a signal
Off = Not acquiring a lock on a signal
Locked Green On = Clock module is locked on a signal
Off = Clock module is not locked on a signal
Holdover Amber On = Clock module is in Holdover mode of operation
Off = Clock module is not in Holdover mode
Table 6-2. Stratum 2E Clock Module Specifications
Performance Characteristic Specification
Free Running Accuracy
Within ±5 x 10
-10
the first year
Within ±5 x 10
-9
after 10 years
Holdover Stability (Rubidium LO)
0 to 24 hrs, @ +10 to +50
°C
0 to 24 hrs, @ 0 to +50
°C
30 days @ +10 to +40
°C
30 days @ 0 to +50
°C
±9 x 10
-11
±1 x 10
-10
±1.5 x 10
-10
±1.7 x 10
-10
Numeric Controlled Oscillator
(NCO) PLL lock range
±5 x 10
-4
Tuning Resolution (Locked Mode)
<1 x 10
-13
Warm-up Time (Warm-up Mode) 20 minutes
Wander Output (Holdover) Includes effects of all SSU-2000 modules:
Compliant with clock levels per ITU-T G.812, T1.101-1999,
and Telcordia Technologies GR-378-CORE and
GR-1244-CORE. Meets SONET requirements per T1.105.
Meets or exceeds performance requirements for ITU-T
G.812 Type II and ETSI Transit Node clocks and T1.101 and
Telcordia Technologies (Bellcore) Stratum 2 clocks.
Jitter (Locked or Holdover) < 4 ns p-p (measured at the CLKA/BIN 8kHz output)
Table 6-1. Stratum 2E Clock Module Status LED Indicators (Continued)
Indicator Color Description
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