后面板
照片 照片厂家: Wandel & Goltermann
尺寸重量: 477*244*425mm 25kg
PCM-4是基准测量仪，这些仪表可用来确定模拟级和数字级之间的特性（“半性道”测量），而且速度和精度很高。仪表含有内置的自检和样准例行程序，以便处理传输和交换中使用的数字系统对测试和测量设备提出的需要。
“半信道”测量 PCM-4可以在PCM复用设备和数字交换模块的模拟级和数字级间进行各种各样的测量，由于仪表也可进行D-D测量，所以还能测试复用转换器。为了测量单个模块。例如编解码器，所有需要的测试能力都可通过64Kbit/s接口来获得。
操作简便并直接分析结果 这些仪表，不管是通过IEC625/IEEE488直接遥控的，还是人工操作的都很容易使用。内置屏幕通过菜单设置测量并用来显示结果。结果可按表格、图形或直方图形式显示。测量方式和参数用触摸键来选择。为一些通常应用进行预设置有助于加快仪表操作的速度。可以将最多40种设置链接在一起，以组成一个测试序列。使用者可建立自动测试过程，以便用此方式满足自己的特定要求。
PCM-4作为自动测量系统 利用PCM-4时无需手动进行例行测量；当仪器用作系统控制器（SC）时，便直接对所需求的测量顺序进行程控。
－—通过简单地将多达40种设置链接在一起，对测量序列进行用户专有的编程。
－—可确定每种设置的信道测量项目，如每个信道的频响测量。
－—全自动测量系列，无需外部控制器。PCM-4对MU-30测试点扫描器进行控制，并在适合的打印机上记录测量结果。利用LabWindows 驱动程序很容易将PCM-5和MU-30组成LabWindows软件开发平台。LabWindows特适合于研究开发工作、生产测试和校准。简单按一下鼠标器，便足以用配备的仪器驱动程序设定PCM-4。一旦命令被复制，测量序列便组合到应用程序中。
不同测试情况的理想解决方案 对不同的应用，要求不同的测量方式。PCM-4可提供所有的方式；PCM-5是基本型仪表，可选的方式太少。
PCM-4在交换设备研制开发阶段的运用 《数字交换设备传输指标测试点滴》
The PCM-4 PCM Channel Measuring Set can handle practically all PCM multiplexer measurements, and also measurements on the constituent subassemblies of digital exchanges. Transmultiplexer measurements are also possible because investigations between digital
| If nothing to hte contrary is stated,the values given below are vaiid for all operating conditions and device settings within the rated rated ranges of use for a.c.livevoltage,a.c.line frequency and ambient temperature | |
| Analog generator | |
| Generator output | |
| BN984/01;984/51 | balanced,floating,3-pin CF connector |
| BN984/02;984/52 | balanced,fem.connector compatible with WECO310 |
| BN984/05;984/55 | balanced,fem.connectorcompatible with 1212 APS |
| Output impedance,switch-selectalbe | 600,850,900Ω and complex |
| Permissible d.c.voltage to earth | ≤60V |
| Send signals | |
| Sinusoidal signals | |
| Frequency range | 20Hz to 72kHz |
| Group-delay measuring signal(PCM-4 only) Similar to the measuring signal described in ITU-URec.O.81 and IEEE Standards |
|
| Measuring frequencies | 292,500,604,1000,1792,2604,2792 and 3396Hz |
| Modulation frequency selectable | 41.66 or 83.33Hz |
| 4-tone signal Four equal level tones at | 857,862,1373 and 1388Hz |
| Send levels Display of power levels (dBm0),can be switched over to voltage levels(dB0) Relative level |
|
| Level entry in steps of 0.001dB from | -19.9 to +9.9dBr |
| Displayed on screen in steps of 0.1dB Levels relative to 1mW at a point of 0 rel.level Level entry in steps of 0.01dB Level range in the preferred range |
|
| for relative level | -17 to +3dBr,at 600Ω |
| for noise(.50 to 550Hz),at least | -60.0 to +2.0 dBm |
| for sine signals(f≧200Hz),at least | -60.0 to +10.0 dBm |
| for all other signals,at least | -30.0 to +2.0 dBm |
| Analog receiver | |
| Receiver input | see"analog generator output" |
| Additional input impedance | ≧30kΩ |
| Two-wire input and output The tow-wire connector can be terminated with a complex impedancefor transhybrid loss measurements |
|
| Receive levels Calibratin. see "analog generator" Relative levels, see"analog generator" |
|
| Levels relative to 1mW at a pontof 0 rel.level Level range in the preferred range of the relative level-9.9to +9.9dBr and at 600Ω |
|
| signal level measurements,at least | -60.0 to +10.0 dBm |
| noise and crosstalk measurements,at lease | -80.0 to 0 dBm |
| Receive filters | |
| Wideband filters passband range | Narrow-band filters passband at : |
| 200Hz to 4kHz 20Hz to 4kHz 330Hz to 3100Hz 20Hz to 72kHz 4.6kHz to 128kHz(PCM-4only) |
301Hz 813Hz 1014Hz 3343Hz 350bis 550Hz |
| Filters for weighted nose measurements Psophometer filter(ITU-T Rec.P.53/O.41) C-message weighting filter to North American standsrds 3kHz flat filter to North Amarican standards Psophometer filter with 2kHz notch-filter C-message weighting filter with 2kHz notch-filtr Bandpass 300 to 3350Hz,with 2kHz notch-filter |
|
| Digital signal generator PCM frame structure BN 984/01 and BN 984/51 32 channel PCM frames containing: |
|
| 30 telephone channels | to ITU-T Rec.G.704 Para.3.3 |
| or 31 telephone channels | time slots 1 to 31 |
| or 32 telephone channels | all time slots |
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 | |
| Selectable between | T1"norm"12FRM/MFRM to ITU-T G.704 Para.3.1and T1"extd."24 FRM/MFRM to ITU-T G.704 Para.3.1 |
| Telephone channels per frame | 24 |
| Channel sequences | D3/D4,D2 or D1D |
| Signalling | |
| μ-law | CCIS or CAS(75/6) |
| A-law | CCIS |
| Generator outputs BN 984/01 and BN 984/51 Interface characteristics comply with ITU-TRec.G703 |
|
| Line codes | NRZ,AMIand HDB3 |
| Coaxial output | Versacon9 Universal Connector System,adaptable to all common connectors |
| Output impedance | 75Ω |
| Balanced output | 3ploe,CF connector |
| Output impedance | 120Ω |
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 Interface characteristics comply withITU-T Rec.G703 and North American standards |
|
| Line codes | AMI and B8ZS |
| Output pulse characteristic | to AT&T Technical Advisory No.34 |
| W-bit insertion | ON or OFF |
| Balanced output | fem.connectro compatible with WECO310(BN 984/02 and984/52)1214APS(BN 984/05and 984/555) |
| Output impedance | 100Ω |
| Operation and clock supply Loop-through operation A test pattern is injected into onetime slot of a PCM frame which has been looped through the PCM-4 |
|
| BN984/01 and BN 984/51 Generator operation |
|
| from internal clock | 2048kHz±25*10-6 |
| or external clock | 2048kHz±100*10-6 |
| or external 8 kHz sync-signal | 8kHz ±100*10-6 or clock derived from receiver signal |
| Digital loops | |
| 2Mbit/s loop: | all time slots are switched through |
| 2Mbit/s loop: | selected time slots can be switched through (independent selection of the receive and send channel is possible) |
| 64 kbit/s loop: | at relevant interfaces(Option) |
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 Generator operation |
|
| from internal operation | 1544±25*10-6 |
| orexternal clock | 1544±100*10-6 |
| orexternal 8kHz sync.signal | 8kHz±100*10-6 or clock derived from receiver signal |
| Digital loops | |
| 1.5Mbit/s loop: | all timeslots are switched through |
| 1.5Mbit/s loop: | selected time slots can be swithced through (inedependent selection of the receive and send channel is possible) |
| 64kbit/sloop: | at relevant interfaces(Option) |
| Digital words for telephone channels BN 984/01 and BN 984/51 |
|
| Injection of a digital signal in one of the telphone channels 1 to 30(or 31,32)or in all telephone channels,or in all telphone channels except the selected channel. | |
| Encodinglaw,selectable | A-law ro μ-law |
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 | |
| Injection of a digital signal in one of the telephone channels 1 to 24,or in all telephone channels,or in all telephone channels except the selected channel. | |
| Encoding law,selectable | A-law or μ-law |
| Send signals Sine signals |
|
| Frequency range | 20Hzto 3.99kHz |
| Send level rage(in stepsof 0.1dB) | -60.0 to +7.5 dBm |
| Noise signals Pseudorandom noise signal |
|
| 350Hzto 550Hz complies with | 300 to 3400Hz |
| Send level range(0.1dB steps) | -65.0 to 0.0 dBm |
| Wideband noise signal for telephone channels | |
| Noise band | 300 to 3400Hz |
| Send level range | -65.0 to 0.0 dBm |
| Conventional telephone signal | complies with ITU-T Rec.G.227 |
| Send level range | -30.0 to 0.0 dBm |
| Echo return loss and singing return loss signals to North American standards | |
| Noiseband of ERL-signal | 560 to 1965Hz |
| Noiseband of SRL-signal | 260 to 500Hz |
| Noiseband of SRLH-signal | 2200 to 3400Hz |
| Send level range | -30.0 to 0.0 dBm |
| Group delay measuring signal | |
| See: | "Analog generator signals" |
| Send level range | -30.0 to 0.0 dBm |
| 4-tone signal | |
| See: | "Analog generator signals" |
| Send level range | -30.0 to 0.0 dBm |
| Idle channel signals Anyfixed word can be selected.It is also possible to select words which vary randomlyor periodically between two neighbouing values |
|
| Bit patterns The following are available for bit error measurements: Pseudorandom sequence complying |
|
| with ITU-TRec.V.52 | 29-1 bits long |
| Pseudorandom sequence complying | |
| with ITU-T Rec.0.152 | 211-1 bits long |
| User-programmable 8 bit word External analog signal(via VAR.MODE) An external analog signal can be input via an internal PCM coder and injicted in one telephone channel oroutput via 64kbit/s interface |
|
| Test facilities and error insertion BN 984/01 and BN 984/81 AIS transmission (continuous sequence of "1"s) |
|
| Frame alignment bit error ratio | 10-3 or 10-4 |
| Frame alignment word errors | 2 or 3 in 4 |
| Multiframe alignment errors of | 1 or 2 in 2 |
| CRC-4 error ate settable in steps of | 0.1% |
| inthe range | 0.1 to 99.9% based on 1s(1000 CRC-4 words) |
| BN984/02,984/52,984/005 and BN 984/55 ALL ONES transmission Bit 2 alarm transmission Bit 2 is set to "0" in each channel S-bit alarm (T1"norm") transmission S-bit in frame 12 is set to "1" m bit alarm (T1"extd") transmission Eight"0"-bit salternating with eight"1"-bits |
|
| FAS errors | 1in 6 bits or 2 in 4 bits |
| S-bit/MFAS errors | 1 or 2 in 6bits |
| CRC-6 error rate settalbe in steps of | 0.3% |
| inthe range | 0.3 to 99.7% based on 999 ms(333 multiframes) |
| Signalling facilities BN 984/01 and BN 984/51 Static signalling bits Transmission of signalling bits a b c d in time slot 16 for selected and unoccupied telphone channels Signalling byt value settable via menu Dynamic signalling bits Signalling bit value for selected telephone channel set externally via aus.parallel input |
|
| BN984/02,BN 9848/52,BN 984/05 and BN 984/55 Static signalling bits Transmission of signalling bits A, B/A,B,D,D for selected and unoccupied telephone channels Singanlling bit value settable via menu Dynamic signalling bits Signaling bit value for selected telephon channel set exgernally via aux.parallel input for CAS(75/6)only,orS/m bit value set externally via contradirectional 4 kbit/s input |
|
| Digital signal receiver PCM frame struture see "digital signal generator" Receiver inputs BN 984/01 and BN 984/51 Interface characteristis comply with ITU-TRec.G.703 |
|
| Line code | NRZ,AMIand HDB3 |
| Coaxial input | 75Ω or>3kΩ |
| Balanced input | 12Ωor >3kΩ |
| Input signal monitoring via LEDs: | NO SIGNAL,AIS ,NO FRAME,NO MULTIRRAME |
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 Interface characteristics comply with ITU-T Rec.G.703 and North American standards. |
|
| Linecodes | AMI and B8ZS |
| Balancedinput | fem.connector compatible with WECO 310(BN 984/02,984/52);1214APS(BN684/05,984/55) |
| Input impedance | 100Ωor >3kΩ |
| Input signal monitoring via LEDs: | NO SIGNAL,ALL ONES,NO SYNC,REMOTE ALARM |
| Evalution of digital word in telephone channels BN 984/01 and BN 984/51 Selectinga telphone channel A code word from one telephone channel 1 to 30(or 31,32)canbe evaluated. Code word measurements |
|
| Encoding law,selectable | A-law or μ-law |
| Receive level range,at least | -80 to +6 dBm |
| BN984/02,BN 84/52,BN 984/05 and BN 984/55 Selecting a telephone channel Acode word from one telephone channel 1 to 24 can be evaluated Code word measurements |
|
| Encoding law, selectable | A-law or μ-law |
| Receive level range ,at least | -80 to +6 dBm |
| Receive filters see"Analog receive " Bit error measurements on telephone channels(64 kbit/s).Shown as a histogram with the X axis representing measuring perides or channels. |
|
| Bit pattern: | see"digital signal generagor send signals" |
| Error conutson FAS/MFAS and CRC-signals Signalling distortion measurements(option;PCM-4 only) Method: Measure the duty cycle deviation of a rectangular signal Generator |
|
| Frequency setting | 10Hz or 20Hz |
| Duty cycle settable in step Analog output(back panel) |
|
| Output impedance,mark | <30Ω |
| space | >20kΩ |
| Max.switching voltage | 200mA |
| Max.switching voltage | 70V |
| Signalling receiver Measuring range | ±10ms |
| Resolution | 0.1ms |
| Analog input(back panel)Input impedance (connected internally to -15V) | 750Ω |
| Shor-circuit current | 10mA |
| Evaluation and monitoring of words and bits BN 984/01 and BN 984/51 Monitor ing via8 LEDs(bits 1 to 8) Codewords of selected channel,FAS,NOT RAS,MFAS NOT MFAS Signalling bits a b c d (TX and RX) Evalution on screen (MODEB91) Codewords of selected channel,FAS,NOT FAS,MFAS,NOT MFAS,Signalling bits a b c d(RX) |
|
| BN984/02,BN 984/52,BN 984/05 and BN 984/55 Monitoring via 8 LEDs(bits 1 to 8) Codewords of selected channel,FAS or MFAS,S bits, Signalling bits ,B/A,B,C,D |
|
| Auxiliary outputs (back panel) Activation signal for crosstalk measurements Analog decoder output for decoded signal of selected telephone channel Signalling output Error and alarm outputs Video signal output |
|
订货信息
| PCM Channel Measuring Set PCM-4 | |
| 2048 kbit/s version,menu in English | BN 984/01 |
| 1544k bit/s version,menu in English,WECO connectors | BN 984/02 |
|
2048 kbit/s version,menu in German |
BN 984/03 |
| 1544 kbit/s version,menu in English,1214 APS connectors | BN 984/05 |
| 2048 kbit/s version,menu in Spanish | BN 984/06 |
| PCM Channel Measuring Set PCM-5 | |
| 2048 kbit/s version,menuin English | BN 984/51 |
| 1544 kbit/s version,menu in English,WECO connectors | BN 984/52 |
| 2048 kbit/s version,menu in German | BN 984/53 |
| 1544 kbit/s version,menu in English,1214 APS connectors | BN 984/55 |
| Options Interfaces: | |
| Codirectional 64 kbit/s input | BN 984/00.01 |
| Codirectional 64 kbit/s output Electrical characteristics to ITU-T G.703 |
BN 984/00.02 |
| Contradirectional 64kbit/s input | BN 984/00.03 |
| Contradirektionaler64 kbit/s output Electrical characteristics to ITU-T G.703 |
BN 984/00.04 |
| Serial 64 kbit/s TTLinput | BN 984/00.05 |
| Serial 64 kbit/sTTL output Co-or contra directional,depending on mode |
BN 984/00.06 |
| Parallel 64 kbit/s TTLinput | BN 984/00.07 |
| Parallel 64kbit/s TTL output Parallel 8 bit input/output with 8kHz clock signal |
BN 984/00.08 |
| 64 kbit/s V.11 interface for measurement of signalling distortion and interference from signalling |
BN 984/00.09 |
| IEEE 488/IEC 625 Interface with IEEE488 connector and K420 connecting calbe |
BN 984/00.09 |
| Analog signalling interface for measurement of signalling distortion and interference from signlling | BN 984/00.19 |
| IEEE488/IEC 625 Interface with IEEE 488 connector and K 420 connecting calbe | BN 958/24 |
| Bridges: Reurn Loss and Longitudinal Conversion Transfer Loss Bridge |
|
| 600Ω/900Ω/CPLX (PCM-4 only) | BN 984/00.10 |
| 600Ω/900Ω/CPLX (PCM-4 only) | BN 984/00.11 |
| Impedance modification (replaces 850Ω or 900Ω and CPLX) | BN 984/00.32 |
| Bridge impedance addition: Up to 4 additional customer specific CPLX impedances canbe added to the bridge;selection lnly via IEC/IEEE interface |
BN 984/00.16 |
| 120kHz low pass filter (for out-of-band noise suppressin) | BN 984/00.14 |
| Software retrofitted to the latest status for | |
| PCM-4BN 984/01 | BN 984/00.41 |
| PCM-4BN 984/02 and BN 984/05 | BN 984/00.42 |
| PCM-4BN 984/03 | BN 984/00.43 |
| Specify actual software version and serial no.when ordering | |
| User specified modifications A detailed specification sheet is available for enteringthe values required |
|
| Analog generator/receiverimpedance modifications (replacces 850Ω/900Ω and CPLX) |
BN 984/00.31 |
| Analong generator output impedance modified to Zou≈0Ω in place of complex impedance |
BN 984/00.34 |
| Impedance modification (replaces 850Ω or 900Ω and CPLX) | BN 984/00.32 |
| 1wire terminaltion modification(replaces 910Ω||39nF) (selected with PARAM 914,D-Dmode) |
BN 984/00.33 |
| Tolerance masks programmed to user specifications | BN 984/00.35 |
| Instruments are equipped with ITU-T tolerance masks as
standard Forms for entering toperance mask changes are included in Appendix D of the operating manual |
|
| Accessories | |
| LabWindow®Driver (for PCM-4/5 and MU-30) for integrationin automatic test systems for development,production and service/calibration |
BN 984/95.99 |
| TestPoint Scanner MU-30 (with Balanced through 0 switching of 10,24 or 30 VF channel in TX and RX directions |
BN 823/11 |
| WG PenBERT mini PCM monitor(E1) (see WG PenBERT data sheet for details) |
BN 4555/11 |
| D.C.Loop Holding Circuit GH-1 (with capacitor-coupled output) | BN 984/00.12 |
| 1.5m connecting calbe: CF(male) to 1214 APS(male) | K348 |
| 1.0m connecting cable: CF(male) to 1214 APS (male) | K438 |
| D.C.Decouplingfor analog inputs and outputs,PCMZ-4 for use
with BN 984/01,BN 984/51,BN 984/03and BN 984/53 only. (Not required if (GH-1 is used) |
BN 984/00.13 |
| IEEE488 |
S832 |
| Front and Back Panel Covers SD-5(1 set) | BN 700/00.25 |
| 19" conversion kty | BN 700/00.05 |
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