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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 |
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Analog generator |
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Generator output |
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BN984/01;984/51 |
balanced,floating,3-pin CF connector |
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BN984/02;984/52 |
balanced,fem.connector compatible with WECO310 |
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BN984/05;984/55 |
balanced,fem.connectorcompatible with 1212 APS |
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Output impedance,switch-selectalbe |
600,850,900Ω and complex |
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Permissible d.c.voltage to earth |
≤60V |
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Send signals |
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Sinusoidal signals |
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Frequency range |
20Hz to 72kHz |
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Group-delay measuring signal(PCM-4 only)
Similar to the measuring signal described in ITU-URec.O.81 and IEEE Standards |
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Measuring frequencies |
292,500,604,1000,1792,2604,2792 and 3396Hz |
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Modulation frequency selectable |
41.66 or 83.33Hz |
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4-tone signal Four equal level tones at |
857,862,1373 and 1388Hz |
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Send levels
Display of power levels (dBm0),can be switched over to voltage levels(dB0)
Relative level |
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Level entry in steps of 0.001dB from |
-19.9 to +9.9dBr |
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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 |
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for relative level |
-17 to +3dBr,at 600Ω |
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for noise(.50 to 550Hz),at least |
-60.0 to +2.0 dBm |
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for sine signals(f≧200Hz),at least |
-60.0 to +10.0 dBm |
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for all other signals,at least |
-30.0 to +2.0 dBm |
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Analog receiver |
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Receiver input |
see"analog generator output" |
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Additional input impedance |
≧30kΩ |
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Two-wire input and output
The tow-wire connector can be terminated with a complex impedancefor transhybrid loss measurements |
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Receive levels
Calibratin. see "analog generator"
Relative levels, see"analog generator" |
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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 |
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signal level measurements,at least |
-60.0 to +10.0 dBm |
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noise and crosstalk measurements,at lease |
-80.0 to 0 dBm |
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Receive filters |
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Wideband filters passband range |
Narrow-band filters passband at : |
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200Hz to 4kHz
20Hz to 4kHz
330Hz to 3100Hz
20Hz to 72kHz
4.6kHz to 128kHz(PCM-4only) |
301Hz
813Hz
1014Hz
3343Hz
350bis 550Hz |
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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 |
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Digital signal generator
PCM frame structure
BN 984/01 and BN 984/51
32 channel PCM frames containing: |
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30 telephone channels |
to ITU-T Rec.G.704 Para.3.3 |
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or 31 telephone channels |
time slots 1 to 31 |
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or 32 telephone channels |
all time slots |
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BN984/02,BN 984/52,BN 984/05 and BN 984/55 |
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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 |
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Telephone channels per frame |
24 |
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Channel sequences |
D3/D4,D2 or D1D |
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Signalling |
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μ-law |
CCIS or CAS(75/6) |
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A-law |
CCIS |
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Generator outputs
BN 984/01 and BN 984/51
Interface characteristics comply with ITU-TRec.G703 |
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Line codes |
NRZ,AMIand HDB3 |
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Coaxial output |
Versacon9 Universal Connector
System,adaptable to all common connectors |
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Output impedance |
75Ω |
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Balanced output |
3ploe,CF connector |
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Output impedance |
120Ω |
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BN984/02,BN 984/52,BN 984/05 and BN 984/55
Interface characteristics comply withITU-T Rec.G703 and North American standards |
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Line codes |
AMI and B8ZS |
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Output pulse characteristic |
to AT&T
Technical Advisory No.34 |
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W-bit insertion |
ON or OFF |
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Balanced output |
fem.connectro compatible with WECO310(BN 984/02 and984/52)1214APS(BN 984/05and 984/555) |
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Output impedance |
100Ω |
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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 |
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BN984/01 and BN 984/51
Generator operation |
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from internal clock |
2048kHz±25*10-6 |
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or external clock |
2048kHz±100*10-6 |
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or external 8 kHz sync-signal |
8kHz ±100*10-6 or clock derived from receiver signal |
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Digital loops |
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2Mbit/s loop: |
all time slots are switched through |
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2Mbit/s loop: |
selected time slots can be switched through (independent selection of the receive and send channel is possible) |
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64 kbit/s loop: |
at relevant interfaces(Option) |
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BN984/02,BN 984/52,BN 984/05 and BN 984/55
Generator operation |
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from internal operation |
1544±25*10-6 |
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orexternal clock |
1544±100*10-6 |
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orexternal 8kHz sync.signal |
8kHz±100*10-6 or clock derived from receiver signal |
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Digital loops |
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1.5Mbit/s loop: |
all timeslots are switched through |
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1.5Mbit/s loop: |
selected time slots can be swithced through (inedependent selection of the receive and send channel is possible) |
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64kbit/sloop: |
at relevant interfaces(Option) |
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Digital words for telephone channels
BN 984/01 and BN 984/51 |
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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. |
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Encodinglaw,selectable |
A-law ro μ-law |
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BN984/02,BN 984/52,BN 984/05 and BN 984/55 |
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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. |
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Encoding law,selectable |
A-law or μ-law |
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Send signals
Sine signals |
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Frequency range |
20Hzto 3.99kHz |
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Send level rage(in stepsof 0.1dB) |
-60.0 to +7.5 dBm |
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Noise signals
Pseudorandom noise signal |
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350Hzto 550Hz complies with |
300 to 3400Hz |
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Send level range(0.1dB steps) |
-65.0 to 0.0 dBm |
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Wideband noise signal for telephone channels |
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Noise band |
300 to 3400Hz |
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Send level range |
-65.0 to 0.0 dBm |
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Conventional telephone signal |
complies with ITU-T Rec.G.227 |
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Send level range |
-30.0 to 0.0 dBm |
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Echo return loss and singing return loss signals to North American standards |
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Noiseband of ERL-signal |
560 to 1965Hz |
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Noiseband of SRL-signal |
260 to 500Hz |
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Noiseband of SRLH-signal |
2200 to 3400Hz |
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Send level range |
-30.0 to 0.0 dBm |
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Group delay measuring signal |
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See: |
"Analog generator signals" |
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Send level range |
-30.0 to 0.0 dBm |
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4-tone signal |
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See: |
"Analog generator signals" |
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Send level range |
-30.0 to 0.0 dBm |
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Idle channel signals
Anyfixed word can be selected.It is also possible to select words which vary randomlyor periodically between two neighbouing values |
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Bit patterns
The following are available for bit error measurements:
Pseudorandom sequence complying |
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with ITU-TRec.V.52 |
29-1 bits long |
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Pseudorandom sequence complying |
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with ITU-T Rec.0.152 |
211-1 bits long |
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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 |
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Test facilities and error insertion
BN 984/01 and BN 984/81
AIS transmission (continuous sequence of "1"s) |
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Frame alignment bit error ratio |
10-3 or 10-4 |
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Frame alignment word errors |
2 or 3 in 4 |
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Multiframe alignment errors of |
1 or 2 in 2 |
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CRC-4 error ate settable in steps of |
0.1% |
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inthe range |
0.1 to 99.9% based on 1s(1000 CRC-4 words) |
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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 |
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FAS errors |
1in 6 bits or 2 in 4 bits |
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S-bit/MFAS errors |
1 or 2 in 6bits |
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CRC-6 error rate settalbe in steps of |
0.3% |
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inthe range |
0.3 to 99.7% based on 999 ms(333 multiframes) |
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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 |
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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 |
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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 |
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Line code |
NRZ,AMIand HDB3 |
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Coaxial input |
75Ω or>3kΩ |
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Balanced input |
12Ωor >3kΩ |
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Input signal monitoring via LEDs: |
NO SIGNAL,AIS ,NO FRAME,NO MULTIRRAME |
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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. |
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Linecodes |
AMI and B8ZS |
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Balancedinput |
fem.connector compatible with WECO 310(BN 984/02,984/52);1214APS(BN684/05,984/55) |
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Input impedance |
100Ωor >3kΩ |
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Input signal monitoring via LEDs: |
NO SIGNAL,ALL ONES,NO SYNC,REMOTE ALARM |
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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 |
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Encoding law,selectable |
A-law or μ-law |
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Receive level range,at least |
-80 to +6 dBm |
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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 |
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Encoding law, selectable |
A-law or μ-law |
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Receive level range ,at least |
-80 to +6 dBm |
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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. |
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Bit pattern: |
see"digital signal generagor send signals" |
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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 |
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Frequency setting |
10Hz or 20Hz |
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Duty cycle settable in step
Analog output(back panel) |
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Output impedance,mark |
<30Ω |
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space |
>20kΩ |
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Max.switching voltage |
200mA |
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Max.switching voltage |
70V |
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Signalling receiver Measuring range |
±10ms |
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Resolution |
0.1ms |
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Analog input(back panel)Input impedance (connected internally to -15V) |
750Ω |
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Shor-circuit current |
10mA |
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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) |
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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 |
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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 |
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