TSB-67. Transmission Performance Specifications for Field Testing of UTP Cabling Systems
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1 TSB-67 Transmission Performance Specifications for Field Testing of UTP Cabling Systems Prepared by: ANSI/EIA/TIA PN-3287 Task Group on UTP Link Performance
2 Required Field Test Parameters for TSB-67 Wire Map Length Propagation Delay Delay Skew Attenuation Near-End Crosstalk (NEXT)
3 The new category 5 wire map same length same attenuation same NEXT same propagation delay already spec d delay skew already spec d Power Sum NEXT new Return Loss new (already in ISO) ELFEXT new Power Sum ELFEXT new
4 Link Definition Channel (Two transitions at each end) Channel End USER S PATCH CORD WALL OUTLET USER S PATCH CORD Channel End HORIZONTAL CABLE PATCH PANEL WIRING CLOSET Under carpet or furniture connector WORK AREA
5 Link Definition Basic Link (One transition at each end) Link End Link End PATCH PANEL WALL OUTLET HORIZONTAL CABLE TESTER PATCH CORD TESTER PATCH CORD WORK AREA WIRING CLOSET
6 Horizontal Cabling Length Limits OVERALL LINK LENGTH LIMIT: 100 Meters Max HUB/SWITCH PATCH CORDS 7m Max* WORK AREA CORDS 3m Max WIRING CLOSET (TC) HORIZONTAL CABLE 90 Meters Max *Total combined length off all patch cords in TC cannot exceed 7m WORK AREA
7 AutoTest Results Autotest runs all tests required by the choosen standard TSB-67: Wire Map Length NEXT Attenuation
8 Wire Map Continuity end-to-end Shorts between any two or more conductors (or shield) Transposed pairs Reversed pairs Split pairs...and any other miswires
9 Correct Pair Wiring
10 Wire Map Results
11 Reversed Pair
12 Transposed Pairs Example: mix T568A and T568B wiring standards = Trouble
13 Pin/Pair Assignment - T568A Pair 2, (Orange) Pair 3, (Green) Pair 1, (Blue) Pair 4, (Brown)
14 Pin/Pair Assignment - T568B Pair 3, (Green) Pair 2, (Orange) Pair 1, (Blue) Pair 4, (Brown)
15 DSP Series Test Results Transposed Pair
16 Split Pairs Caused by connecting wires from different pairs to paired pins This effectively results in an untwisted cable which can cause a high level of Near-end Crosstalk (NEXT)
17 Split Pairs
18 DSP Series Test Results
19 Nominal Velocity of Propagation (NVP) The speed at which a signal travels in a cable, expressed as a percentage of the speed of light in vacuum. NVP = speed at which pulse travels in cable speed of light in vacuum X 100% Speed of light in vacuum is 300,000 km/s or 0.3 m/nsec
20 Length Calculation Length = RT_Prop_delay (nsec) x NVP x Speed_of_Light Example: measurement of Prop_delay: 435 nsec NVP (%) 2 Length (ft)
21 Length Results
22 Length Measurement Reporting Measured Link Length Calculated for shortest electrical delay Includes the length of the two patch cords Test Limit (PASS/FAIL) Maximum allowable link length PLUS 10% Calculated for shortest electrical delay
23 Propagation Delay ns 486 ns 494 ns 484 ns
24 Propagation Delay
25 Delay Skew The difference in propagation delay ns (481 ns) 5ns (486 ns) 13 ns (494 ns) 3ns (484 ns)
26 Delay Skew
27 DSP Series Test Results
28 Attenuation The amount of signal loss in the transmission link (expressed in db) Signal Source Signal Receiver db Loss
29 Sources/Causes Attenuation The electrical characteristics of the cable materials and its construction Insertion losses due to improper termination (IDC) Reflections due to impedance mismatches Effect Above a certain amount of loss, the cabling link may not reliably transmit network data
30 Attenuation as a Function of Frequency TEST CABLE (300 ft) 25 Attenuation (db) Pair 1,2 PASS: 30-May-97 01:20:22pm MHz Mukilteo Cable Co. TIA Cat 5 Basic Link Limit
31 Attenuation View Plot
32 DSP Series Test Results
33 Attenuation Measurement Reporting PASS Highest measured attenuation and frequency at which this occurred Test limit at this frequency FAIL Measured attenuation and frequency at which this occurred Test limit at this frequency
34 Near End Crosstalk (NEXT) Transmit Receive Crosstalk measures the amount of signal interference from one pair to another pair NEXT measures crosstalk at the signal source (Near End)
35 Effects of NEXT Similar to noise interference Induced signal may have sufficient amplitude to corrupt the original signal to be falsely detected as valid data Effect: intermittent station lockup complete network attachment failure
36 NEXT
37 NEXT Results
38 NEXT is measured in db NEAR END 1 Tx signal 2 3 Rx dist. 6 FAR END NEXT (db) = 10 Log Power of measured disturbance Power of transmitted signal
39 NEXT View Plot Press View Plot Press Next Pair to view other pair combina-tions Press EXIT until you return to the Autotest results screen
40 NEXT Measurement To be measured from both ends of the link
41 NEXT measurements taken at the far end Highlight Press ENTER Press View Plot
42 Why Do We Need Next Measurement at Both Ends? NEAR END FAR END Tx PAIR Rx PAIR BAD CONNECTOR Crosstalk of MHz
43 Testing from the Far End Reveals the Problem NEAR END FAR END Tx PAIR Rx PAIR BAD CONNECTOR Crosstalk of MHz
44 NEXT Measurement Evaluation Worst Case Margin: +4.8dB at 2.7MHz
45 NEXT - Worst Case Margin Margin: Difference between measured value and pass/fail (minimum performance) value Positive margin means NEXT Loss is better than minimum (Pass) Negative margin means NEXT Loss exceeds the minimum (Fail) Worst case: smallest margin the point closest to the standard s limit across all frequencies
46 (Pair-to-pair) NEXT B A D C 6 Combinations A B A C A D B C B D C D
47 NEXT Headroom Worst case NEXT across all 12 pair-topair NEXT tests 6 pair combinations from Main Unit 6 pair combinations from Remote Unit Headroom indicates the quality of the link Positive = PASS Bigger value is better
48 Calculating Headroom Headroom = worst Worst Case NEXT Margin Headroom = 6.5dB
49 The traditional two-pair system S/N = ACR Workstation Transmit (Output) Receive (Input) NEXT External noise Signal Signal LAN equipment Receive (Input) Transmit (Output)
50 ACR Attenuation to Crosstalk Ratio A variant of Signal to Noise Ratio The difference between NEXT (in db) and Attenuation (in db) The best performance indicator to determine useable bandwidth
51 Link Performance NEXT is used as indicator for quality of components and workmanship. ACR as an indicator of maximum usable bandwidth. 10 db: still usable signal power 0 db: noise power equals signal power you cannot rely on signal energy above the frequency at which the ACR = 0 db
52 TIA Limits: Attenuation, NEXT, ACR Limit in db Att (limit) NEXT (limit) ACR (limit) Frequency in MHz
53 Measured ACR Values ACR in db ACR (limit) ACR (DSP) Frequency in MHz
54 DSP Series ACR Test Results
55 Power Sum NEXT Workstation Outlet Horizontal Cabling Patch Panel Hub Power Sum NEXT is the combined NEXT on one wire pair from all other wire pairs
56 Power Sum NEXT The amount of crosstalk induced on a pair when signals are applied simultaneously to all other cable pairs A harder test to pass than NEXT uses TIA NEXT pair-to-pair limits Will be included in new standard It s a calculation, not measurement.
57 Power Sum NEXT PS NEXT Margin PSNEXT Plot
58 NEXT and FEXT Workstation Telecommunications Outlet Cabling Patch panel Hub NEXT FEXT FEXT is additive all crosstalk along the link adds to the FEXT disturbance observed at the receiver
59 Multiple pair -parallel transmission Far-End Crosstalk (FEXT) adds disturbance Workstation Transmit (Output) Transmit (Output) Signal 1 Signal 2 FEXT LAN Equipment Receive (Input) Receive Input Example: 1000BASE-T: 4 pairs are used.)
60 ELFEXT (Equal Level FEXT) Workstation Outlet Horizontal Cabling Patch panel Hub FEXT attenuation ELFEXT (signal difference in db) ELFEXT is the FEXT level relative to the attenuated signal (FEXT-Attenuation)
61 Power Sum ELFEXT Workstation Transmit (Output) Signal 1 FEXT LAN Equipment Receive (Input) Example: 1000BASE-T: 4 pairs are used.)
62 ELFEXT: A factor in S/N Ratio Measure Far End Crosstalk Loss ( analogous to measuring NEXT loss) Measure attenuation ELFEXT: Subtract attenuation from FEXT loss ELFEXT: another indication of S/N for LAN systems where two or more signals travel in the same direction (1000BASE-T).
63 PSNEXT and PSFEXT Multiple Disturber NEXT (MDNEXT): Power Sum addition of NEXT Losses Multiple Disturber FEXT (MDFEXT): Power Sum addition of FEXT Losses Of particular importance in 2 situations: Use of 25-pair cable Network applications that use parallel transmission over 2 or more wire pairs
64 Return Loss A measure of reflected signal power over the frequency range of interest Result of variations in Characteristic Impedance Structural variations due to the cable manufacturing process Connectors Installation
65 Effect of Return Loss Full Duplex LAN systems System A Transmit Output Receive Input Signal A to B Reflection Signal B to A Directional Coupler System B Receive Input Desired signal = attenuated signal from other end. Noise = reflected signal on same wire pair.
66 Noise contributors in S/N Ratio ACR is the traditional S/N indicator for 2-wire pair LAN systems ACR no longer will be the only measure ELFEXT loss is another S/N indicator when multiple signals are transmitted in parallel Return loss causes another S/N degradation when signals on a wire pair are transmitted in two directions at the same time (Full Duplex)
67 Combined Noise Disturbance Transmit Output Receive Input Receiver must detect attenuated signal Disturbance at receiver input: NEXT (3 other pairs) ELFEXT (3 other pairs) Return Loss
n Proper pin termination at each end n Continuity to the remote end n Shorts between any two or more conductors n Transposed pairs: n Crossed pairs.
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