OSA 4520 GPS by niusheng11

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									                      OSA 4520 GPS-SP
         GPS—Synchronisation Pack G.812 type I, V, VI compliant




                                                                                                                                          Oscilloquartz SA – Rue des Brévards 16 – CH-2002 Neuchâtel – Switzerland – Tel. : +41 32 722 55 55 – Fax : +41 32 722 55 56 – osa@oscilloquartz.com - www.oscilloquartz.com
The existing and emerging                       r e c e i v er c i r c ui t , a h i g h -         intended as a backup reference
standards in the world of mobile                performance OCXO oscillator and                   input in case the GPS signal is
telecommunications and digital                  an input interface for standard                   absent. As outputs, the unit
broadcasting demand the highest                 synchro-nisation signals together                 provides 10 MHz and 2.048 MHz
quality of synchronisation. A                   with a variable voltage power                     square waved signal in addition to
proper timing signal becomes                    supply. The OSA 4520 GPS-SP is                    one digital E1 / T1 and one 1PPS
therefore more and more important               fully equipped with an internal                   timing output on BNC (T1:BNO)
for media centres as well as for                OCXO oscillator which filters out the             connectors.
cellular operators where location               noise from the received GPS signal,               The OSA 4520 GPS-SP has proven
services such as E911 will get more             thus providing a G.811 signal                     excellent performance level of,
importance.                                     output. The unit also provides jitter             amongst others, MTIE in harsh
Telecommunication networks that                 & wander filtering and a holdover                 temperature conditions, as
lack accurate synchronisation often             capability according to ITU-T                     specified in ETSI 300 019-2-3.2. This
suffer from bit errors and/or slow              G.812.                                            makes it suitable for synchronising
transmission rates. Without precise             The OSA 4520 GPS-SP is equipped                   2, 2.5 and 3rd generation cellular
timing, transmissions often lose                with one BNC antenna connector                    networks such as cdmaOne,
some      information     in   their            together with an additional                       cdma2000 and UMTS. These mobile
translation, particularly in the                electrical auxiliary timing input                 networks require their base stations
realm of light-speed data and                   (please refer to next page data for               to synchronise the frames on the
broadband systems.                              the choice of auxiliary inputs)                   radio interface to a common
OSA 4520 GPS-SP is a                                                                                         reference.
stand-alone GPS                                     OSA 4520 GPS-SP                                          The OSA 4520 GPS-SP
                                                            Block Diagram
receiver module                                                                                              provides the basic
specially designed to                                       Internal com m unication
                                                                                                             signals required for
supply precise timing                GPS engine               Tracking System
                                                                                    Micro
                                                                                 Controller
                                                                                                 RS232C
                                                                                                Alarm relay
                                                                                                             these applications. Its
as specified by the                                                                                          holdover mode keeps
International                                                                                                the base stations
Telecommunication                                                               Frequency &       10MHz
                                                                                                             operational, even when
Union in recomen-                   Auxiliary input
                               G .703-X                         OCXO 8663        Tim e Code
                                                                                   O utput
                                                                                                2.048MHz
                                                                                                 E1 / T1
                                                                                                  1 PPS
                                                                                                             GPS satellite signals are
dation G.811 and                                                                                             momentarily lost,
G.812. The unit                   Power Supply Unit
                                                                                                             caused for example by
consists of a GPS-                                                                                           interference problems.



Highlights:

! Reliable, low cost and compact GPS receiver
! Simultaneous tracking of up to 8 satellites                                           OSA
! E1, T1, or frequency auxiliary input
! G.703 compliant E1 / T1 output
! 2.048 MHz (G.703) and 10 MHz outputs
                                                                                        4520
! UTC locked 1 PPS outputs
! Intregrated high stability holdover functionality :                                  GPS-SP
                                          -10
    - Frequency stability < 1 x 10 / day
! ITU-T G.811 compliant when locked to GPS
! ITU-T G.812 (I, V, VI) compliant holdover
                                                                       Technical specifications 4520
                                                     Typical Applications
                                                       !                Lab reference source                                                                                                                                                               !                  State and federal communication systems/simulcast




                                                                                                                                                                                                                                                                                                                                                                                                                        Oscilloquartz SA – Rue des Brévards 16 – CH-2002 Neuchâtel – Switzerland – Tel. : +41 32 722 55 55 – Fax : +41 32 722 55 56 – osa@oscilloquartz.com - www.oscilloquartz.com
                                                       !                Cellular networks like UMTS, GPRS and CDMA                                                                                                                                         !                  Specialised ATM and LAN/WAN sync requirements
                                                       !                Re-timing of traffic signal, e.g. for transit switches                                                                                                                             !                  Satellite ground stations equipment
                                                       !                Wireless and wireline telecom sync requirements                                                                                                                                    !                  Power utility and public services
                                                                                                                                                                                                                                                           !                  Any systems requesting accurate Time & Frequency
                                                          BNC Inputs:                                                                                                                                                                            BNC Outputs (BNO for 1.544 Mbps):
                                                          !             Choice of antenna cable :                                                                                                                                                !        1x choice of
                                                                        - 20m (RG58),                                                                                                                                                                    - 1.544 Mb/s, (balanced 100 Ω)
                                                                        - 60m (RG213),                                                                                                                                                                   - 2.048 Mb/s, (unbalanced 75 Ω)
                                                                        - 120m (RG213w/ amplifier),                                                                                                                                              !        1 x 10 MHz, 1 Vrms sine, 50 Ω
                                                                        - up to 300m (FlexCell cable).                                                                                                                                           !        1 x 2.048 MHz, G.703 compliant, 75 Ω
                                                          !             Choice of auxiliary input                                                                                                                                                !        1 x 1 PPS, 200ms width, AC-MOS, 50 Ω
                                                                        - T1 : 1.544 Mb/s, G.703 compliant
                                                                        - E1 : 2.048 Mb/s (unbalanced 75 Ω
                                                                        - Frequencies: 0.064 CC, 1.544, 2.048, 5, 10 MHz

                                                          Alarm Interface :                                                                                                                                                                      Management interface :
                                                          !             1 relay contact                                                                                                                                                          !        RS-232C

                                                          Power Supply (*required external adaptor) :                                                                                                                                            Physical dimension :
                                                          !             Choice of :                                                                                                                                                              !        H:                            143.7mm (5,66”)
                                                                        19—26 VDC                                                                               72—132 VAC*                                                                      !        W:                            62,8mm (2.47” )
                                                                        36—72 VDC*                                                                              150—265 VAC*                                                                     !        D:                            278.6 mm (10.97” )

                                                          Performance when locked to GPS-signal :                                                                                                                                                Hold-Over performances:
                                                          !             1 PPS within ± 50ns from UTC (peak-to-peak)                                                                                                                              !        Long term stability :                                       1x10-10/day / 2x10-8/year
                                                                        G.703-x compliant to ITU-T G.811                                                                                                                                         !        Frequency stability:                                        6x10-10 pp (0°C to +70°C)
                                                                        ADEV < 10-12 (25’000 seconds)



                                                                                                         OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                       OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                        OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                                          OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                                      MTIE                               WANDER GENERATION PRC G811
                                                                                                                                                               TIE

                                                                                                                                                                                                                                                                       1.0E-4
                                                   2.5E-8


                                                   2.0E-8



                                                   1.5E-8
                                                                                                                                                                                                                                                                       1.0E-5


                                                   1.0E-8



                                                   5.0E-9

                                                                                                                                                                                                                                                                       1.0E-6
                                                                                                                                                                                                                                                      MTIE(s)




                                                          0
                             TIE(s)




                                                                                                                                                                                                                                                          MTIE[s]
                                          TIE[s]




                                                   -5.0E-9


                                                   -1.0E-8                                                                                                                                                                                                             1.0E-7



                                                   -1.5E-8


                                                   -2.0E-8
                                                                                                                                                                                                                                                                       1.0E-8          Wander generation PRC G811
                                                   -2.5E-8



                                                   -3.0E-8

                                                                                                                                                                                                                                                                       1.0E-9
                                                   -3.5E-8
                                                              0        10000   20000   30000   40000   50000   60000    70000       80000        90000     100000    110000   120000   130000   140000   150000       160000   170000   180000                                   0.1            1          10                100                1000             10000            100000           1000000   10000000
                                                                                                                                                Time [s]                                                                                                                                                                                      Tau [s]
                                                                                                                                                                                                                                                           MTIE max : 5.51E-08 [s]




                                                                                                         OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                        OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                        OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                                          OSA 4520 GPS-SP, Tau=2000s, T=cste
                                                                                                                                                                                                                                                                                                                      TDEV                               WANDER GENERATION PRC G811
                                                                                                                                                                    ADEV

                                                                                                                                                                                                                                                                     1.0E-7
                                          1.0E-11


                                                                                                                                                                                                                                                                         4
                                                      6

                                                                                                                                                                                                                                                                         2

                                                      4
                                                                                                                                                                                                                                                                     1.0E-8

                                                                                                                                                                                                                                                                         6

                                                                                                                                                                                                                                                                         4              Wander generation PRC G811
                                                      2
                                                                                                                                                                                                                                                       TDEV(s)




                                                                                                                                                                                                                                                                         2
                            ADEV




                                                                                                                                                                                                                                                          TDEV[s]




                                                                                                                                                                                                                                                                     1.0E-9
                                   ADEV




                                          1.0E-12
                                                                                                                                                                                                                                                                         6

                                                                                                                                                                                                                                                                         4


                                                                                                                                                                                                                                                                         2

                                                      4
Version 06/Nov. 2002/ORIS




                                                                                                                                                                                                                                                                    1.0E-10

                                                                                                                                                                                                                                                                         6

                                                                                                                                                                                                                                                                         4
                                                      2
                                                                                                                                                                                                                                                                         2


                                                                                                                                                                                                                                                                    1.0E-11
                                                                                                                                                                                                                                                                                0.1                 1                10                         100                      1000              10000              100000
                                          1.0E-13
                                                                  10           2         4     6       100         2            4           6        1000             2           4      6       10000            2             4       6    100000                                                                                          Tau [s]
                                                                                                                                                  Tau [s]                                                                                                  Limit of validity : 1.44E+04 [s]

								
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