Activating The Modern Return Plant Presented By Michael E. McCracken Eastern Show ‘96 Presented By Michael E. McCracken Eastern Show ‘96

2 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Topics

3 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Return Path Overview AM Fiber LinkCoaxial DistributionHeadendTransport Drop

4 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant The Forward & Return RF Spectrum 5MHz750MHz Return Forward 40MHz54MHz System Split …..

5 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Two-Way Amplifier MHz MHz MHz Forward Amplifier Return Amplifier Diplex Filter C H L H C L From/To Headend To/From Subscriber

6 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Diplex Filter Crossover 5MHz750MHz Return Forward 40MHz54MHz Crossover Amplitude

7 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant AM Fiber Link Diplex Filter Forward ReceiverForward Transmitter Return ReceiverReturn Transmitter Forward Fiber Return Fiber AM Optical Node Hub or Headend To/From Distribution System

8 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant RF Impulse-Pay-Per-View AM Fiber LinkCoaxial Distribution Drop Settop Terminal HeadendTransport Control System

9 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant RF-IPPV Frequency Allocation 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz v v 15.45MHz17.75MHz

10 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant RF-IPPV Bandwidth Utilization MHz17.75 MHz 2.3MHz 23 Channel Slots 100kHz

11 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant High-Speed Cable Modems AM Fiber LinkCoaxial Distribution Drop Settop Terminal HeadendTransport Interface

12 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Modem Frequency Allocation 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz

13 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Modem Bandwidth Utilization 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz 1 MHz

14 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Telephony Telephone Interface AM Fiber LinkCoaxial Distribution Drop HeadendTransport Interface

15 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Telephony Frequency Allocation 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz 50 kHz 1 Voice Channel = 50kHz

16 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Telephony Bandwidth Utilization 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz 240 Channels in 12MHz

17 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Status Monitoring Monitoring System AM Fiber LinkCoaxial Distribution Drop HeadendTransport

18 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Status Monitoring Frequency Allocation 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz 29.8MHz Typical

19 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Status Monitoring Bandwidth Utilization 5 MHz40 MHz29.8MHz 250 kHz

20 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Interactive Services Video Server AM Fiber LinkCoaxial Distribution Drop HeadendTransport Digital Settop Terminal

21 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Interactive Services Frequency Allocation One or more channels Frequency Agile 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz Signaling Channel

22 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Interactive Services Bandwidth Utilization 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz 1.0 MHz

23 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Current Bandwidth Utilization 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz RF-IPPV Telephony Cable Modem Status Monitoring Interactive Services

24 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Proposed Bandwidth Allocation 5 MHz40 MHz10 MHz15 MHz20 MHz25 MHz30 MHz35 MHz RF-IPPV Telephony Cable ModemStatus MonitoringInteractive Services

25 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Bandwidth Limitations 5MHz750MHz Return Forward 40MHz54MHz

26 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Segmented Reverse Fiber Cable Coaxial Distribution Diplex Filter Reverse Fiber Tx Fiber Rx

27 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Block Conversion Optical Receiver Optical Transmitter Block Converter Block Converter Combiner 54 MHz750 MHz Reverse Block MHz Reverse Block MHz Upstream Blocks MHz MHz MHz MHz 35 MHz 54075

28 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant High-End Return 735 MHz Forward 50 MHz1 GHz Return 900 MHz

29 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Thermal Noise Carrier-to-Noise Ratio Noise Energy RF Carrier

30 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Noise Accumulation: Forward

31 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Noise Accumulation: Return

32 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Managing Thermal Noise Return TransmittersReturn Combining Network Noise

33 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant RF Ingress HAM 40 M20 M15 M CB Land Mobile 40MHz Land Mobile Civil Air Patrol 5.0MHz Sub-Split Return Spectrum Potential Ingress Sources

34 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Non-RF Ingress Power line conducted emissions and noise Household electric motor noise Industrial electric motor noise Electrical switches Electrostatic discharge

35 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Ingress Causes Drop Reports of 70 to 90% caused by drops and house wiring. 10 to 30% caused by coaxial plant problems.

36 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Drop Cable Transfer Impedance Frequency 0MHz1GHz 0 m  /m 100 m  /m Headend Quad 60/40 Quad 60% Braid Worse Better 50MHz

37 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant RF Egress Potential for Harmful Interference HAM 40 M20 M15 M CB Land Mobile 40MHz Land Mobile Civil Air Patrol 5.0MHz Sub-Split Return Spectrum

38 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Rules on Interference Concerned with “harmful interference” –Radio navigation –Safety of life and protection of property –Radiocommunication services System Operator must eliminate the problem “immediately” –Measures include service or even system shutdown Concerned with “harmful interference” –Radio navigation –Safety of life and protection of property –Radiocommunication services System Operator must eliminate the problem “immediately” –Measures include service or even system shutdown

39 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Summary Bandwidth is limited and must be carefully managed Thermal Noise is a natural phenomenon and must be managed Ingress points must be located and eliminated on a continuous basis Egress must be tracked down and eliminated to prevent interference with radio communications Bandwidth is limited and must be carefully managed Thermal Noise is a natural phenomenon and must be managed Ingress points must be located and eliminated on a continuous basis Egress must be tracked down and eliminated to prevent interference with radio communications

40 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Basic Network Headend End of line Far from Headend Large house Two outlets First tap Closer to headend Short drop Small house Three outlets

41 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Headend Pad Modulator Combiner Same Amplitude RF Carriers To Distribution

42 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Forward AM Fiber Links Forward Tx Forward Rx From HeadendTo Distribution Fiber Signal Input Signal Output

43 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Forward Unity Transmission Condition Established Condition Repeated From Headend Gain = Loss Output Level Input Level

44 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Basic Forward Amplifier EQ Interstage Section -20dB Test -20dB Test Input Test Point Output Test Point PAD Input Amp Output Amp

45 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Amplifier Spacing Obstacle (Water) Normal Spacing Short Spacing

46 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Amplifier Pad Input Test Point Input Amp +24dB Desired Input = 11dBmV Input = 16dBmV 5 Attenuation 24dB - 19dB = 5dB Amplifier Output 11dBmV + 24dB = 35dBmV -19dB Amplifier Input 16dBmV - 5dB = 11dBmV

47 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Amplifier Pad Application From Headend Pad: = 0 Input: = 11 Forward Pad used to achieve same input level on all amplifiers dBmV 35dBmV Pad: = 1 Input: = 11 Pad: = 4 Input: = 11 Pad: = 2 Input: = 11

48 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Forward Amplifier Equalizer EQ Interstage Section -20dB Test -20dB Test Input Test Point Output Test Point PAD Input Amp Output Amp

49 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Attenuation vs. Frequency x Frequency = 2 x Attenuation Attenuation Factor Frequency in MHz

50 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Loss Ratio Flat Test Signal Cable = 24dB at 800MHz 6dB 24dB

51 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equalizer Attenuation Curve Attenuation Frequency in MHz Equalizer Cable Equalizer + Cable

52 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equalizer Function 6dB 50MHz100MHz200MHz400MHz800MHz 8.5dB 16.5dB 13dB 12dB 17dB 8dB 19dB 1dB Equalizer Attenuation 24dB 25dB Cable Attenuation 25dB

53 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equalizer Function dB dB 24dB25dB Equalizer 24dB 800MHz Equalizer InputEqualizer Output Equalizer Reference Frequency

54 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Pad and Equalizer Practice From Headend Pad: EQ : Input: dBmV 35dBmV Pad: EQ : Input: Pad: EQ : Input: Pad: EQ : Input: Pad: EQ : Input: Includes EQ Loss

55 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Transition to Tapped Feeder From Headend dBmV 35dBmV = 18dBmV = 48dBmV

56 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equal Loss Signal Splitting dBmV -4 Distribution System with equal loss taps 44dBmV38dBmV32dBmV26dBmV20dBmV14dBmV Unacceptable amplitude differences Inefficient signal distribution

57 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equal Loss Distribution -2 48dBmV Distribution System with selectable attenuation 16dBmV Equal amplitude at all subscriber connections Equal attenuation to all subscriber connections Feeder amplitude preserved for additional distribution Attenuation: (5 x 1) + (5 x 2) + 17 = 32dB Amplitude: 48dBmV - 32dB = 16dBmv

58 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Summary All signals aligned to common amplitude at Headend The Forward Fiber Link provides “transparent” transport The Coaxial Trunk system provides “Unity Transmission” The Coaxial Feeder provides equal distribution of available signal All signals aligned to common amplitude at Headend The Forward Fiber Link provides “transparent” transport The Coaxial Trunk system provides “Unity Transmission” The Coaxial Feeder provides equal distribution of available signal

59 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Basic Return Network Headend End of line Far from Headend Large house Two outlets First tap Closer to headend Short drop Small house Three outlets Sources

60 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Signal Combining Pad Modulator Combiner Same Amplitude RF Carriers To Distribution

61 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Return Path as a Combiner Source Common Test Point Combiner Settops Objective: Achieve desired amplitude and quality at common test point. HFC Network

62 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Signal Combining at the Home TV 1 TV dB 1.67 = -1.25dB 1.67 = -.58dB 1.67 = -.17dB +55 dBmV +55 dBmV dBmV Cable Modem

63 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Terminal Calibration TV 1 TV dB 1.67 = -1.25dB 1.67 = -.58dB 1.67 = -.17dB +54 dBmV dBmV dBmV Cable Modem

64 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Combining in the Feeder Plant dBmV Attenuation: (5 x 1) + (5 x.5) + 17 = 24.5dB Attenuation: 32dB Reverse Amplifier Input 1:16.0dBmV4:20.5dBmV 2:17.5dBmV5:22.0dBmV 3:19.0dBmV6:23.5dBmV

65 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Traditional Concept dBmV 46.5dBmV 45dBmV 43.5dBmV 42dBmV 40.5dBmV Attenuation: (5 x 1) + (5 x.5) + 17 = 24.5dB Attenuation: 32dB Reverse Amplifier Input = 16dBmV Terminal output adjusted to compensate for path conditions

66 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Unity Loss in Return Path dBmV 48 dBmV 48 dBmV 48 dBmV 48 dBmV 48 dBmV Reverse Amplifier Input Uniform at 16.0dBmV Maximum output level for best carrier/interference ratio Return Path Pad Attenuation: 32dB Attenuation: (5 x 1) + (5 x.5) = 32dB

67 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Splitters and DCs in the Return Path dBmV 48 dBmV 48 dBmV 48 dBmV 48 dBmV 48 dBmV dBmV 48 dBmV 48 dBmV Total Attenuation always = 32dB Amplifier Input Always = 16dBmV 1 Values are arbitrary examples

68 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Basic Reverse Amplifier EQ Interstage Section -20dB Test -20dB Test Input Test Point Output Test Point PAD Input Amp Output Amp Rvrs Amp Diplexer -20dB Test -20dB Test EQ PAD -20dB Rev Inj

69 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Pads and EQs EQ Interstage Section -20dB Test -20dB Test Input Test Point Output Test Point PAD Input Amp Output Amp Rvrs Amp Diplexer -20dB Test -20dB Test EQ PAD -20dB Rev Inj

70 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Pad Application To Headend A B Gain vs Attenuation Path A = 10 - (4 + 1) = 5dB Path B = 10 - (2 + 8) = 0dB Amplifier #3 Input 12 3 A B

71 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Pad Application (con’t) To Headend AB Attenuation vs Gain Path A = 10 - ( ) = 0dBmV Path B = 10 - ( ) = 0dBmV Amplifier #3 Input 0dB Pad 5dB Pad 12 3 A B

72 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Pad Exercise EQ PAD +10dB EQ PAD +10dB EQ PAD +10dB Reverse Amp A Reverse Amp BReverse Amp C -4dB -1dB -8dB -1dB

73 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Unity Transmission Condition Established Condition Repeated To Headend Gain = Loss Output Level Input Level

74 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Equalizers EQ Interstage Section -20dB Test -20dB Test Input Test Point Output Test Point PAD Input Amp Output Amp Rvrs Amp Diplexer -20dB Test -20dB Test EQ PAD -20dB Rev Inj

75 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Attenuation vs. Frequency x Frequency = 2 x Attenuation Attenuation Factor Frequency in MHz

76 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Cable Loss Ratio Flat Test Signal Cable = 24dB at 800MHz 6dB 24dB

77 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equalizer Attenuation Curve Attenuation Frequency in MHz Equalizer Cable Equalizer + Cable

78 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Equalizer Function 2.1dB 5MHz10MHz20MHz40MHz 3dB 4dB 4.3dB 2.7dB 4.9dB 1dB Equalizer Attenuation 6dB Cable Attenuation 7dB

79 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Equalizer Function 540 7dB 540 2dB 6dB7dB Equalizer 6.0dB 40MHz Equalizer InputEqualizer Output Equalizer Reference Frequency

80 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Pad and EQ Practice To Headend Pad: EQ : Atten: +10 Pad: EQ : Atten: Pad: EQ : Atten: Pad: EQ : Atten: Pad: EQ : Atten: Includes EQ Loss

81 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse AM Fiber Links Reverse Rx Reverse Tx To HeadendFrom Distribution Fiber Signal Output Signal Input

82 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Summary All paths must have equal attenuation Reverse signals must be maintained at the highest possible levels 40MHz signals experience only about one fourth the cable attenuation of 750MHz signals Passive devices attenuate forward and reverse signals approximately the same All paths must have equal attenuation Reverse signals must be maintained at the highest possible levels 40MHz signals experience only about one fourth the cable attenuation of 750MHz signals Passive devices attenuate forward and reverse signals approximately the same

83 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Early Return Path Application 2T9 Video/Audio returned to headend on Return Path channel Return Path Channel translated to Forward Path channel Subscribers view local video on Forward Path channel

84 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Basic Alignment Technique Signal Source Technician 1 Injects calibrated test signal Selects Pads and EQs Technician 2 Informs Tech 1 of results

85 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Improved Alignment Technique 2 Return Path signal displayed on analyzer Technician views analyzer display on TV and makes adjustments to Return Path Spectrum Analyzer Baseband Video Camera views analyzer display Camera output modulated to Forward Path channel Signal Source

86 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Sweeping vs Balancing Balancing with two carriers Only two reference points visible Broadband Sweeping Hundreds of reference points

87 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Sweep Equipment Headend Unit Field Unit

88 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Typical Sweep Display 5MHz40MHz 5db/Div Ref Lvl +20dBmV

89 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Return Path Activation Steps Install sweep system headend unit Configure sweep equipment Install and Align Reverse Fiber Link Install and Align reverse amplifiers in sequence, from first to last Install sweep system headend unit Configure sweep equipment Install and Align Reverse Fiber Link Install and Align reverse amplifiers in sequence, from first to last

90 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Installing the 3ST Transmitter Combining Network Forward Laser Forward Laser Return Path Receiver Return Path Receiver Return Signal Break-out Diplex Filter H / L Fiber Out Fiber In out in Sweep Signal -10 to -12dB Telemetry Signal -5dB Input -10dBmV to +10dBmv

91 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Configuring the 3ST Transmitter Enable Reverse Sweep Select Reverse Telemetry Carrier Frequency Create a Reverse Sweep Plan Select a Reverse Sweep Plan Enable Reverse Sweep Select Reverse Telemetry Carrier Frequency Create a Reverse Sweep Plan Select a Reverse Sweep Plan

92 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Sweeping a Fiber Node Forward Receiver Forward Receiver Reverse Transmitter Reverse Transmitter LHLH Fiber In Fiber Out From System inout 3SR External RF In Forward Test Point Fiber node

93 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Reverse Fiber Receivers Return Path Receiver Return Path Receiver Return Signal Break-out Diplex Filter H / L Fiber In in Return Path Receiver Return Path Receiver Fiber In Return Path Receiver Return Path Receiver Fiber In Return Path Receiver Return Path Receiver Fiber In Return Signal Combiner -8dB-11dB dBmV +3.5dBmV

94 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Inboard Test Points LHLH Coaxial Cable inout 3SR Forward Test Point LHLH Coaxial Cable Two-way Amplifier with Test Point Inboard of Diplex Filter

95 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Outboard Test Points LHLH Coaxial Cable inout 3SR Forward Test Point NS-6 LHLH Coaxial Cable Two-way Amplifier with Test Point Outboard of Diplex Filter Wavetek Model 3ST Operating Guide Section 5.1.3

96 GTS Enterprises, Inc. Wednesday, September 18, 1996 Activating the Modern Return Plant Summary Understand your Return Path application Know the design specifications Install and configure the sweep system headend equipment Align the Reverse Fiber Links for uniform receiver output Align the coaxial plant to have least impact on transmitted signals Understand your Return Path application Know the design specifications Install and configure the sweep system headend equipment Align the Reverse Fiber Links for uniform receiver output Align the coaxial plant to have least impact on transmitted signals