Symmetricom SDU-2000, User Manual

Page: 131 / 470

12713020-002-2 Revision D – April 2004 SSU-2000 User’s Guide 131
Clock Module Reference Data
Stratum 3E Clock Module
Performance Specifications
Specifications for the Stratum 3E Clock module are provided in Table 6-4 .
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 6-4. Stratum 3E Clock Module Performance Specifications
Performance Characteristic Specification
Free Running Accuracy
Within ±2.5 x 10
-7
, the first year (vendor spec)
Within ±3.7 x 10
-6
after 20 years (vendor spec)
Holdover Stability
0 to 24 hrs, @ +10 to +50
°
C
0 to 24 hrs, @ 0 to +50
°
C
±5 x 10
-9
±1 x 10
-8
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:
Exceeds requirements of (ANSI) T1.101-1994, T1.105.09, ITU
G.811, T1X1.3 (proposed new limits for wander generation),
and G.823
Jitter (Locked or Holdover) < 4 ns p-p (measured at the CLKA/BIN 8 kHz output)
Table 6-3. Stratum 3E Clock Module Status LED Indicators (Continued)
Indicator Color Description