Symmetricom 1100, 1000 manual Inputs, Hold-in and Pull-in Range, Input supported

Chapter 7 Specifications of the TimeProvider

Inputs

Hold-in and Pull-in Range

Table 7-3lists the default values for the Hold-in range and Pull-in range for the Clock cards available for the TimeProvider.

Table 7-3. Hold-in and Pull-in Range

Clock Type	Hold-in Range	Pull-in Range
Type I (Quartz IOC only)	9.8 E-6	9.3 E-6
Type II/ST2 (Rb IOC only)	4.0 E-8	3.5 E-8
Type III/ST3E (Quartz IOC only)	9.8 E-6	9.3 E-6

According to GR-1244, hold-in is the process by which an NE and its clocks maintain lock to the active reference as the frequency of that reference varies arbitrarily slowly. Thus, the hold-in range is the largest band of input signal frequency for which the NE and its clocks will maintain lock. As is the case for the pull-in range, the hold-in range is generally specified so that an NE/clock of a given stratum level will maintain lock with a reference that is traceable to a clock of the same stratum level.

According to GR-1244, pull-in is the process during which an NE's clocks become locked to a reference. In turn, an NE's pull-in range is the largest band of input reference signal frequency for which its clocks will acquire lock. In general, pull-in requirements are intended to assure that any NE/clock will always be able to lock to a reference signal that is traceable to a clock of equal (or higher) quality. Therefore, for a given stratum level the minimum pull-in range is generally the same as the maximum acceptable free-run frequency offset.

Inputs

Front Access and Rear Access shelves contain three card slots: two for IOC cards and one for an IMC or integrated IMC/TPIU card.

Each IOC supports three input ports: two span inputs and one PRS input.

Input supported:

PRS Input port: 2048 kHz G.703/13, 1.544/5/6.312/10 MHz sine or square

Input ports 1 and 2: 2048 kbit/s,G.703/9, 2048 kHz G 703/13, DS1, 1.544/5/6.312/10 MHz sine or square, CC/JCC/JCC4 composite clock

196 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008