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FiberHome CiTRANS R820, Hardware Description

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1 Cabinet

(1) Mounting hole for the top-connection bent

angle bracket

(2) Wiring hole at the cabinet top

(3) Cabinet-top ventilation hole

(4) Cabinet Indicator

(5) ESD protection earth ground fastener

(6) Mounting hole on the vertical mounting

flanges

(7) Wiring hole at the cabinet bottom

(8) Front door

(9) Side door

(10) Button on the side door

Figure 1-3

Main Components of a 19-inch Cabinet and Their Names

Version: A

1-5

Summary of Contents for CiTRANS R820

Page 1: ...CiTRANS R820 Edge Router Hardware Description Version A Code MN000001856 FiberHome Telecommunication Technologies Co Ltd May 2014...

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Page 3: ...ocal sales representative service representative or distributor for any help needed at the contact information shown below Fiberhome Telecommunication Technologies Co Ltd Address No 67 Guanggu Chuangy...

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Page 5: ...nt are used for identification purposes only and are trademarks or registered trademarks of their respective holders All rights reserved No part of this document including the electronic version may b...

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Page 7: ...hnical specifications CiTRANS R820 Edge Router Hardware Description Introduces the structure functions specifications and technical parameters of the product s hardware components including cabinets s...

Page 8: ...the following readers u Planning and designing engineers u Commissioning engineers u Operation and maintenance engineers To utilize this manual these prerequisite skills are necessary u IP MPLS techn...

Page 9: ...rd MSS3 Two Port Ethernet Mixed Interface Card E1S1 16 E1 Line Card with CES PWRS1 Power Supply Terminal Card FAN FAN Control Card Symbol Conventions Symbol Convention Description Note Important featu...

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Page 11: ...pical Layout 1 8 1 2 21 inch Cabinet 1 9 1 2 1 Model 1 10 1 2 2 Appearance 1 10 1 2 3 Cabinet Structure 1 11 1 2 4 Indicator 1 14 1 2 5 Typical Layout 1 15 2 PDP 2 1 2 1 Model 2 2 2 2 Function 2 2 2 3...

Page 12: ...4 4 4 2 5 Indicator 4 5 4 2 6 Safety Sign 4 5 4 2 7 Technical Parameters 4 5 4 3 Slot Allocation 4 6 4 4 Access Bandwidth 4 6 4 5 Safety Sign 4 7 4 6 Technical Parameters 4 7 5 Card 5 1 5 1 Overview 5...

Page 13: ...le 6 14 6 5 1 Network Cable Between the OTNM2000 and the Equipment 6 14 6 5 2 Ethernet Service Cable 6 15 6 5 3 Clock and Time Cables 6 16 6 6 Optical Fiber Jumper 6 20 Appendix A Card Name and Number...

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Page 15: ...e of the PDP250B 2 3 Figure 2 2 Front Panel of the PDP250B 2 3 Figure 2 3 Connection Terminal Card of the PDP250B 2 4 Figure 2 4 Panel of the PDP250B 2 5 Figure 2 5 Lightning Protection Module 2 9 Fig...

Page 16: ...6 5 Alarm Cable of the Head of Row Cabinet 6 9 Figure 6 6 Alarm Cable of a Subrack 6 11 Figure 6 7 RJ 45 Connector 6 11 Figure 6 8 Connector of an E1 Cable 6 13 Figure 6 9 Network Cable 6 14 Figure 6...

Page 17: ...4 Subrack Alarm Input Terminals 2 7 Table 2 5 Definitions of Pins on the Plug of the Lightning Protection Module 2 9 Table 2 6 PDP250B Technical Parameters 2 10 Table 3 1 Technical Parameters of the...

Page 18: ...s of the E1S1 Card 5 21 Table 5 18 Major Functions of the PWRS1 Card 5 22 Table 5 19 Panel of the PWRS1 Card 5 23 Table 5 20 Technical Parameters of the PWRS1 Card 5 24 Table 6 1 Cables and Connectors...

Page 19: ...ble 6 17 Table 6 21 Pinout and Wiring Scheme of the 75 ohm Clock Cable 6 18 Table 6 22 Pinout and Wiring Scheme of the Time Cable 6 18 Table 6 23 Connection Method of the External Clock Cable 6 19 Tab...

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Page 21: ...ring of cables and optical cables dust proof and Electromagnetic Interference EMI The CiTRANS R820 can be installed in a standard 19 inch or 21 inch cabinet The following introduces the appearance str...

Page 22: ...of 19 inch Cabinet Size H W D mm Available Height inside Cabinet mm 1600 600 600 32U 2000 600 600 41U 2200 600 600 46U 2600 600 600 55U 1 1 1 Model The CiTRANS R820 subrack can be installed on four t...

Page 23: ...abinet Figure 1 1 Appearance of a 19 inch Cabinet 1 1 3 Cabinet Structure A 19 inch cabinet consists of the cabinet body and cabinet doors Figure 1 2 shows the exploded view of the cabinet Version A 1...

Page 24: ...The cabinet body mainly consists of four vertical mounting flanges the cabinet top the cabinet base as well as slide rails and connecting pieces between the vertical mounting flanges u Cabinet doors...

Page 25: ...Cabinet top ventilation hole 4 Cabinet Indicator 5 ESD protection earth ground fastener 6 Mounting hole on the vertical mounting flanges 7 Wiring hole at the cabinet bottom 8 Front door 9 Side door 10...

Page 26: ...tatus of the cabinet 5 ESD protection earth ground fastener For installing the ESD protection wrist strap to prevent the equipment from the electrostatic damage 6 Mounting hole on the vertical mountin...

Page 27: ...1 Cabinet Version A 1 7...

Page 28: ...quipment has a minor alarm OFF The equipment does not have a minor alarm 1 1 5 Typical Layout To ensure normal air cooling and wiring observe the following principles when installation each component...

Page 29: ...R820 can be installed in a 21 inch cabinet Four types of 21 inch cabinets are available as shown in Table 1 5 Table 1 5 Size of Each Type of 21 inch Cabinet Size H W D mm Available Height inside Cabi...

Page 30: ...ck can be installed on four types of 21 inch cabinets as listed in Table 1 6 Table 1 6 21 inch Cabinet Model Cabinet Model 21 inch cabinet 4 102 589 4 102 590 4 102 591 4 102 592 1 2 2 Appearance Figu...

Page 31: ...et Figure 1 6 Appearance of a 21 Inch Cabinet 300 mm in Depth 1 2 3 Cabinet Structure The 21 inch cabinet 300 mm in depth consists of the cabinet body and cabinet doors as shown in Figure 1 7 Version...

Page 32: ...onsists of four vertical mounting flanges the cabinet top the cabinet base as well as slide rails and connecting pieces between the vertical mounting flanges u The cabinet doors include the front door...

Page 33: ...r 4 Rear door 5 Wiring channel 6 Wiring hole at the cabinet bottom 7 Mounting hole on the vertical mounting flanges 8 Front door 9 Mounting hole for the top connection bent angle bracket 10 Cabinet to...

Page 34: ...equipment from the electrostatic damage 5 Wiring channel For laying wires and cables 6 Wiring hole at cabinet bottom When bottom access wiring mode is used all wires and cables are led in and out via...

Page 35: ...connected to the power supply OFF The equipment is disconnected from the power supply Red critical major alarm indicator ON The equipment has a critical or major alarm OFF The equipment does not have...

Page 36: ...pical layout The minimum reserved space above or under each subrack is reserved for air cooling or wiring of the equipment u If the cabinet is not fully occupied arrange subracks from the bottom up an...

Page 37: ...2 PDP The following introduces the PDP used by the CiTRANS R820 Model Function Appearance Front Panel Connection Terminals and Switches Lightning Protection Module Technical Parameters Version A 2 1...

Page 38: ...outside such as the head of row cabinet and outputs active and standby power concurrently for two subracks u The PDP receives the alarm information from subracks presents alarms through indicators on...

Page 39: ...PDP250B 2 4 Front Panel On the front panel of the PDP250B the positions of automatic circuit breakers and lightning protection failure indicator FAIL are marked as shown in Figure 2 2 Figure 2 2 Front...

Page 40: ...PDP250B as shown in Figure 2 3 and Table 2 1 Figure 2 3 Connection Terminal Card of the PDP250B Table 2 1 Components on the PDP250B Connection Terminal Board Component Terminal Jumper Pin Description...

Page 41: ...ms 11 XS2 XS5 0 V output terminals working in active standby mode 12 XPB3 XPB4 XPB5 Subrack alarm convergence connector 2 5 2 Switches The PDP250B provides two main power switches and six branch power...

Page 42: ...of the External Power Supply Connection Terminal Description SW1 SW2 48 V input terminals of the external power supply 0V terminals of XS3 and XS4 0 V input terminals of the external power supply PE t...

Page 43: ...nals The subrack alarm input can be connected to the XS1 XS13 XS14 terminal or XPB3 XPB4 XPB5 terminal of the PDP250B For descriptions about each terminal see Table 2 4 Table 2 4 Subrack Alarm Input T...

Page 44: ...tor for critical alarms Alarm Terminal of the Head of Row Cabinet XPB1 is an alarm terminal of the head of row cabinet The three pins from the top down output the CALL NUA and UA signals respectively...

Page 45: ...s connected to the level 1 lightning protection 0 V through an inductor 8 20 Lightning protection failure alarm When the lightning protection module fails the indicator on the module is solid red and...

Page 46: ...OTNM2000 Electromag netic compatibility EMC Electromag netic interference EMI Radiated emission RE Comply with the EN55022 Class B standard Conducted emission CE Comply with the EN55022 Class B stand...

Page 47: ...is imposed in the positive and negative directions between the external power input terminals 48 V and PE and between 0 V and PE The PDP can work normally after the surge current is imposed Environme...

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Page 49: ...3 AC DC Power Adapter The following introduces the AC DC power adapter used by the CiTRANS R820 Model Function Appearance Technical Parameters Version A 3 1...

Page 50: ...230 V to the DC power 48 V Two hot swappable rectifier modules PSUs are configured for the system and the normal operating voltage range of the PSU is 90 V to 290 V A monitoring module PMU is configu...

Page 51: ...meters of the AC DC Power Adapter Item Performance Specification Input Input voltage range V 154 to 286 Input voltage frequency Hz 47 to 63 AC input system Three wire single phase Maximum input curren...

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Page 53: ...TRANS R820 It accommodates various cards The following introduces the structure and technical parameters of the CiTRANS R820 subrack Subrack Structure Fan Control Card Slot Allocation Access Bandwidth...

Page 54: ...S N Name Function Remark 1 Mounting ear For fixing the subrack onto the cabinet 2 Subrack earth ground pole and earth ground label For notifying operators where the protection earth ground cable of t...

Page 55: ...0 is 2 200 816 4 2 2 Function The fan control card is used for air cooling the equipment The OTNM2000 can control the operating status of fans to ensure that the equipment runs normally and efficientl...

Page 56: ...fan control card works in intelligent mode Function Implementation The fan control card adopts the slow start mode to reduce the impacts on the equipment when fans are started In intelligent mode fan...

Page 57: ...or ON red The fan control card has a critical alarm ON yellow The fan control card has a non critical alarm OFF The fan control card does not have any alarm 4 2 6 Safety Sign Table 4 3 describes the s...

Page 58: ...tion of a Subrack Slots 01 04 and 05 in the CiTRANS R820 subrack are permanently allocated to the SCUS1 2 3 PWRS1 and fan control card Slots 02 and 03 are service slots where various types of service...

Page 59: ...ipment caused by the human body electrostatic ESD Subrack earth ground sign This sign marks the location of the subrack earth ground 4 6 Technical Parameters Table 4 6 lists technical parameters of th...

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Page 61: ...5 Card The following introduces functions and panels of cards on the CiTRANS R820 Overview Introduction to Cards Version A 5 1...

Page 62: ...in the system 5 1 1 Appearance Figure 5 1 shows the appearance of a card 1 Card label 2 Card name 3 Card interface 4 Latch 5 Captive screw Figure 5 1 Appearance of a Card Table 5 1 lists dimensions o...

Page 63: ...ree views of each type of cards Service Card Figure 5 2 shows the three views of a service card using the E1S1 card as an example Figure 5 2 Three Views of the Service Card Core Switch Card Figure 5 3...

Page 64: ...ANS R820 Edge Router Hardware Description Figure 5 3 Three Views of the Core Switch Card Power Card Figure 5 4 shows the three views of a power card Figure 5 4 Three Views of the Power Card 5 4 Versio...

Page 65: ...l Unit SCUS2 Router System Control Unit2 SCUS3 Router System Control Unit3 Power card PWRS1 Power Supply Terminal Card Service card MSS1 Octal Port Ethernet Mixed Interface Card MSS2 Four Port Etherne...

Page 66: ...rds and Slots Slot Type Card Meaning Slot Slot of the core switch card SCUS1 Router System Control Unit 01 SCUS2 Router System Control Unit2 SCUS3 Router System Control Unit3 Slot of the power card PW...

Page 67: ...l 2 201 342 u SCUS3 model 2 201 363 Functions u NE management functions 4 The panel provides the auxiliary management interfaces including the Console Aux AIF and COM interfaces 4 Supports remote writ...

Page 68: ...and VRRP 4 Supports OAM at four layers link layer tunnel layer PW layer and Ethernet service layer 4 Supports the hierarchical QoS function u Time and clock synchronization functions 4 Provides the 2...

Page 69: ...5 Card Figure 5 6 Front Panel of the SCUS1 SCUS2 SCUS3 Card Table 5 4 describes the panel of the SCUS1 SCUS2 SCUS3 card Table 5 5 describes the interfaces or terminals on the panel Version A 5 9...

Page 70: ...M2000 is not smooth SUBS BCT response indicator green Blinking Communication between the BCTand the NE management unit is normal or the card is upgrading its software No blinking The NE management uni...

Page 71: ...FE1 to FE4 FE electrical port Interface type RJ45 FE5 to FE8 FE optical port Interface type LC GE9 to GE10 GE optical port Interface type LC SCUS3 FE1 to FE4 FE electrical port Interface type RJ45 GE...

Page 72: ...input 8 LDT Serial port data output COM MC 1 FTP Positive terminal of the Ethernet data output 2 FTN Negative terminal of the Ethernet data output 3 FRP Positive terminal of the Ethernet data input 4...

Page 73: ...ative terminal of the PPS signal 4 GND Signal ground 5 GND Signal ground 6 PPS_P Positive terminal of the PPS signal 7 TOD_N Negative terminal of the TOD signal 8 TOD_P Positive terminal of the TOD si...

Page 74: ...to 5 Center wavelength nm 770 to 860 1270 to 1355 1275 to 1350 1500 to 1580 1500 to 1580 Overload optical power dBm 0 3 3 3 9 Receiving sensitivity dBm 17 20 23 23 31 Minimum extinction ratio dB 9 9 9...

Page 75: ...rd u Completes signal conversion and outputs the active and standby GE signals to the backplane u Processes the clock data and card control signals u Supports hot insertion of cards and optical module...

Page 76: ...CiTRANS R820 Edge Router Hardware Description Figure 5 7 Panel of the MSS1 MSS2 MSS3 Card Table 5 10 describes the panel of the MSS1 MSS2 MSS3 card 5 16 Version A...

Page 77: ...tered ON The card has a minor alarm GE FE1 to GE FE8 Inputs or outputs FE GE signals Interface type LC Applicable Slot The MSS1 MSS2 MSS3 card can be inserted to slot 02 or 03 Technical Parameters Tab...

Page 78: ...FE Optical Interface Specifications of the MSS1 MSS2 MSS3 Card Item Specification Optical interface type 100BASE FX 100BASE FX 100BASE FX Target distance km 15 40 80 Source type SLM SLM SLM Mean laun...

Page 79: ...red and unstructured emulation modes u Supports the differential and adaptive clock recovery modes u Supports over voltage under voltage protection and power alarm monitoring u Supports line loopback...

Page 80: ...erating indicator green Blinking quickly The card is operating normally OFF The card is not operating normally ON The card is not operating normally or communication between the card and the OTNM2000...

Page 81: ...7 lists mechanical parameters power consumption and interface specifications of the E1S1 card Table 5 16 Technical Specifications of the E1S1 Card Item Specification Weight kg 0 5 Power consumption W...

Page 82: ...the output port dB Return loss between 51 kHz and 102 kHz 6 Return loss between 102 kHz and 3072 kHz 8 Return loss of the input port dB Return loss between 51 kHz and 102 kHz 12 Return loss between 10...

Page 83: ...erface Description ACTA ACTB Power output indicator green ON The power output is normal ALMA ACTB Lightning protection failure alarm indicator red ON The lightning protection function fails A A 48 V i...

Page 84: ...cification Weight kg 0 3 Dimensions H W D mm 41 26 223 Maximum power consumption W 1 6 Voltage V 40 to 60 Under voltage protection point V 362 Under voltage recovery point V 382 Over voltage protectio...

Page 85: ...6 Cables The following introduces the cables and connectors used by the CiTRANS R820 Overview Power Cable and Earth Ground Cable Alarm Cable E1 Cable Network Cable Optical Fiber Jumper Version A 6 1...

Page 86: ...ound Alarm cable Alarm cable of the head of row cabinet 3 695 135 Sends the equipment alarms to the head of row cabinet Subrack alarm cable 3 695 095 Sends alarms to the PDP E1 cable 2Mbit s 75 cable...

Page 87: ...nical parameters of the cabinet power cable Model The cabinet power cable is a tri color power cable Table 6 2 lists the models of the cabinet power cable Table 6 2 Models of the Cabinet Power Cable C...

Page 88: ...lack Naked wire 0 V terminal of XS3 Square shape plug Protection earth ground of the standby power supply in the equipment room 48 V power cable of the active power supply blue Naked wire SW1 of the a...

Page 89: ...the PDP Structure As shown in Figure 6 2 one end of the cabinet protection earth ground cable is the naked wire and the other end is an uninsulated spade tongue terminal Between two ends is a yellow...

Page 90: ...ers of the subrack power cable Generally the PDP is used to supply the DC power to subracks Model The model of the subrack power cable is 408000161 Usage The subrack power cable connects the PDP to a...

Page 91: ...cable Table 6 8 Technical Parameters of the Subrack Power Cable Item Specification Power terminal 2 5mm2 27A blue Connector post 12A 4P Power cable blue black RVV2 2 5 49 0 25 6 2 4 Subrack Protectio...

Page 92: ...ground cable Uninsulated ring tongue crimped terminal on one end Earth ground pole on the subrack Uninsulated ring tongue crimped terminal on the other end Mounting hole on the rear vertical mounting...

Page 93: ...inet connects the PDP to the head of row cabinet It sends the equipment alarm signals from a cabinet to the head of row cabinet Structure As shown in Figure 6 5 one end of the alarm cable of the head...

Page 94: ...Technical Parameters of the Alarm Cable of the Head of Row Cabinet Item Specification Cable type AVVR Color Brown black blue Maximum current A 3 Conductor cross sectional area mm2 3 0 5 6 3 2 Subrack...

Page 95: ...RJ 45 Connector Table 6 13 describes the color coding scheme of a straight through cable are connected Table 6 13 Pinout and Wiring of A Straight through Cable Pin on the Local End Core Wire Color Pi...

Page 96: ...al parameters of the subrack alarm cable Table 6 15 Technical Parameters of the Subrack Alarm Cable Item Specification Cable type CAT 5 twisted pair Connection type RJ 45 Number of cores 8 Diameter of...

Page 97: ...t and Wiring Scheme of the E1 Cable Pin Cable S N Defini tion Pin Cable SN Defini tion Pin Cable SN Defini tion Pin Cable SN Defini tion 1 1 R0 33 17 R8 9 9 R4 41 25 R12 2 1 34 17 10 9 42 25 17 2 T0 4...

Page 98: ...ables used by the CiTRANS R820 6 5 1 Network Cable Between the OTNM2000 and the Equipment Model u 3 695 095 straight through cable u 3 695 096 cross over cable Usage The network cable connects the OTN...

Page 99: ...ork adapter port of the computer where the OTNM2000 is installed Technical Parameters Table 6 18 lists technical parameters of the network cable between the OTNM2000 and the equipment Table 6 18 Techn...

Page 100: ...connected as follows u The RJ 45 connector on one end is connected to the RJ 45 port on the SCUS1 card u The RJ 45 connector on the other end is connected to the RJ 45 port on the Ethernet data servi...

Page 101: ...time synchronization signals Structure Figure 6 11 shows the appearance of the 75 ohm and 120 ohm clock cable Figure 6 11 Appearance of the Clock and Time Cable u Table 6 20 defines the pinouts and wi...

Page 102: ...onnector Cable Pin Color Coaxial Cable Definition 1 White Orange The first core wire T 2 Orange The first shielding wire 3 White Green 4 Blue The second core wire R 5 White Blue The second shielding w...

Page 103: ...subrack The other end External clock source interface u Table 6 24 describes how the time cable is connected Table 6 24 Connection Method of the Time Cable Terminal Connected to The RJ 45 connector TO...

Page 104: ...OFC LC PC SC PC S 20 u Model of the FC PC optical fiber jumper OFC LC PC FC PC S 20 Usage As the transmission carrier of optical signals the optical fiber jumper is used for short distance transmissi...

Page 105: ...the ODF Technical Parameters Table 6 26 lists technical parameters of optical fiber jumpers Table 6 26 Technical Parameters of Optical Fiber Jumpers Name Cable Model Interface Type Optical fiber jumpe...

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Page 107: ...2 200 813 Router System Control Unit2 SCUS2 2 201 342 Router System Control Unit3 SCUS3 2 201 363 Octal Port Ethernet Mixed Interface Card MSS1 2 200 814 Four Port Ethernet Mixed Interface Card MSS2 2...

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Page 109: ...nsions H W D mm Weight kg Power consumption W Subrack 44 4 447 223 6 0 SCUS1 20 38 198 2 4 55 SCUS2 20 386 198 2 4 53 SCUS3 20 386 198 2 4 52 MSS1 20 192 198 0 5 8 5 MSS2 20 192 198 0 5 7 MSS3 20 192...

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Page 111: ...be hurt by laser beams u If an optical fiber should be removed for a long time cover the optical interface with an anti dust cap u Use a fiber puller when inserting or pulling out an optical fiber C...

Page 112: ...3 FRP Positive terminal of the Ethernet data input 4 E Serial port signal ground 5 LDR Serial port data input 6 FRN Negative terminal of the Ethernet data input 8 LDT Serial port data output COM MC 1...

Page 113: ...Protection earth ground TOD 3 PPS_N Negative terminal of the PPS signal 4 GND Signal ground 5 GND Signal ground 6 PPS_P Positive terminal of the PPS signal 7 TOD_N Negative terminal of the TOD signal...

Page 114: ...CiTRANS R820 Edge Router Hardware Description Figure C 1 E1 Interface For definitions of pins on the 75 or 120 E1 interface see the Installation Guide C 4 Version A...

Page 115: ...r major alarm OFF The equipment does not have any critical or major alarm Minor alarm indicator yellow ON The equipment has a minor alarm OFF The equipment does not have a minor alarm D 2 Indicators o...

Page 116: ...ltered ON red The card has a critical or major alarm NUA Minor alarm indicator OFF The card does not have any minor alarm or all the minor alarms are filtered ON yellow The card has a minor alarm Tabl...

Page 117: ...tor Blinking green Communication between the BCT and the NE management unit is normal or the card is upgrading its software No blinking The NE management unit has not received the BCT response Blinkin...

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Page 119: ...Best Master Clock BMU Board Management Unit BPDU Bridge Protocol Data Unit BSC Base Station Controller CAR Committed Access Rate CBS Committed Burst Size CE Custom Edge CES Circuit Emulation Service C...

Page 120: ...C Forwarding Equivalence Class FIB Forwarding Information Base FPGA Field Programmable Gate Array FR Frame Relay FRR Fast Reroute GE Gigabit Ethernet GR Graceful Restart GRE Generic Routing Encapsulat...

Page 121: ...ate Packet LSR Label Switching Router LTE Long Term Evolution MA Maintenance Association MAC Media Access Control Multi chassis Link Aggregation Group MD Maintenance Domain MDF Main Distribution Frame...

Page 122: ...el PE Operator Edge PHB Per Hop Behavior PHP Penultimate Hop Popping PIR Peak Information Rate PPPoE Point to Point Protocol over Ethernet PSNP Partial Sequence Number Packet PTN Packet Transport Netw...

Page 123: ...iplexing TPID Tag Protocol Identifier TPS Tributary Protection Switching UPS Uninterruptible Power Supply URPF Unicast Reverse Path Forwarding UPE User Facing Provider Edge VC Virtual Channel VC Virtu...

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Page 125: ...en do you use the documentation Frequently Rarely Never Other please specify 2 When do you use the documentation in starting up a project in installing the product in daily maintenance in trouble shoo...

Page 126: ...nion on the Figures in the documentation Beautiful Unbeautiful your advice Practical Unpractical your advice 10 What is your opinion on the layout of the documentation Beautiful Unbeautiful your advic...

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