Microtest TSB-67 - 568A Annex E - page 53

Page 53
Length
• TDR method determines length and distance to cable faults
• Range: 0 to maximum distance
• where maximum distance = 915 meters (3000 ft)for twisted pair cable
= 1220 meters (4000 ft) for coaxial cable
• Accuracy: ± K ± Length Resolution ± NVP uncertainty
where K = ±4% of length or 0.6 meters (2 ft), whichever is greater
• Length Resolution: 0.3 meters (1 ft)
PentaScanner+ NEXT and Attenuation Measurement Performance Specifications
*Notes:
(1) NEXT accuracy is calculated at the Basic Link Limit (29.3 dB) per error model in TSB-6 7 A.3
(2) NEXT accuracy is calculated at the Channel Limit (27.1 dB) per error model in TSB-6 7 A.3
(3) Performance assumes a high performance modular 8 plug
(4) Attenuation accuracy calculated per error model in TSB-67 A.3
Near-End Crosstalk (NEXT)
• Tests all six pair combinations
• Frequency range 0.7 to 100 MHz
• Sweep Mode 0.1 MHz, 0.2 MHz, 0.5 MHz linear or TIA (user selectable)
• Dynamic Range:
PentaScanner+ : Measurement dynamic range > 75 dB
PentaScanner / PentaScanner Cable Admin : At least 15 dB > 568A
• Measurement Accuracy:
PentaScanner+ : Calculated per TIA TSB-67 error model (see NEXT and Attenuation
Specifications table)
PentaScanner / PentaScanner Cable Admin : 1.5 dB when measured ±1.5 dB when
measured using fixed attenuators
• Measurement resolution: 0.1 dB
Attenuation
• Tests all four pairs using far end active signal injection
PentaScanner+ NEXT and
Attenuation Performance
Parameters @ 100MHz Testing through
36-Pin Connector
Testing
through
Mod 8
Adapter
Typical Typical
Max
Dynamic Accuracy (dB) 0.3 0.5 0.3
Residual NEXT (dB) 67 62 45
Output Signal Balance (dB) 50 43 40
Common Mode Rejection (dB) 45 38 34
Random Noise (dB) 78 75 78
Transmit Return Loss (dB) 26 23 20
Receive Return Loss (dB) 22 17 17
NEXT Accuracy (dB) @ 100 MHz 0.5 (*1) 0.9 (*1) 1.5 (*2,3)
Atten. Accuracy (dB) @ 100 MHz 0.3 (*4) 0.6 (*4) 0.6 (*3,4)