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2240 Fiber Optic Modem

2.2.2 Internal Control Switches

An 8-position DIP switch located on the modem board provides access for internal
control options (see Figure 2-3). Switch positions 1 through 6 provide the follow-
ing options:

•

Carrier Detect (CD) Signal Options (1 and 2)

•

Clocking Options (7 and 8)

External Clock Mode, switch position 7, and the Divide Ratio Table Select, switch
position 8, are described in Section 2.2.2.2.

NOTE: The nomenclature used for this switch is "off" equals "open."

Factory switch settings are shown in Figure 2-3.

Figure 2-3.

Eight-Position

Internal Options

DIP Switch

Содержание 2240

Страница 1: ...Modems Model 2240 Fiber Optic Modem Users Manual...

Страница 2: ...ctro static Discharge ESD grounding procedures ATTENTION Cet quipement peut avoir une diode laser mettant des longueurs d onde allant de 1300nm 1600nm L utilisation d instruments optiques par exemple...

Страница 3: ...as been made to keep the information in this document current and accurate as of the date of publication or revision However no guarantee is given or implied that the document is error free or that it...

Страница 4: ...4 Canoga Perkins Model 2240 Fiber Optic Modem...

Страница 5: ...s 18 1 6 Loss Budget 18 1 7 Initial Unit Testing 18 2 Installation and Setup 19 2 1 Installation 19 2 1 1 Unpacking the Unit 19 2 1 2 Standalone Modem Installation 19 2 1 3 Rack Mount Modem Installati...

Страница 6: ...Mode 35 3 5 Asynchronous Mode Mode 6 35 3 6 Consideration of Propagation Delays 37 3 7 Internal Clock Option Switches 38 3 7 1 TBL NORM Switch 38 3 7 2 CLK EXT Switch 38 4 Data Interfaces 41 4 1 Data...

Страница 7: ...449 RS 423 Model MC1 60 4 6 1 1 RS 449 DC 37 Interface 61 4 6 1 1 1 RS_BIAS Jumper 63 4 6 1 1 2 RR Jumper 63 4 6 1 1 3 CS_GATE Jumper 63 4 6 1 1 4 CH_GND Jumper 64 4 6 1 1 5 UNBAL_REF Jumper 64 4 6 1...

Страница 8: ...12 Standalone Reconfiguration 94 5 Troubleshooting 95 5 1 Diagnostic Procedures 95 5 2 Local and Remote Loopback 95 5 2 1 Loopback Tests 95 5 2 2 Remote Loopback Test 96 6 Diagnostic Procedures 97 6 1...

Страница 9: ...nectors 75 4 5 Available Strapping Options for Programmable Buffered Interface 78 4 6 Board Layout for Programmable Buffered Interface 79 4 7 Programmable Buffered Interface Model P53 Basic DCE RS 530...

Страница 10: ...57 4 G RS 366A Adapters 60 4 H RS 449 Pinouts for Model MC1 61 4 I RS 423 Pinouts for Model MC1 65 4 J RS 366A Adapters 66 4 K CCITT V 35 Pinouts for MC2 68 4 L Pinout Differences MC2 435 vs MC2 436...

Страница 11: ...e Rate and Mode selection refer to Section 3 including the common rates of 1 536 Mbps 1 544 Mbps and 2 048 Mbps Refer to Section 2 Installation for further details The 2240s are intended to operate wi...

Страница 12: ...cated on the front panel of the modem in both standalone and rackmount versions An 8 position DIP switch on the front panel is for the control of operating modes and internal clock rates Use of this s...

Страница 13: ...s offers a variety of features including local audible visible and remote power failure alarms optional redundant power supply Rack mount modems are hot swappable Figure 1 2 Model 2201 Rack Chassis 1...

Страница 14: ...rack mount modem cards and a 2200R card occupy three slots to provide a redundant fiber optic path Special interface boards Redundant Paddle Boards 4PB are substituted for the normal I O boards in the...

Страница 15: ...2240 Fiber Optic Modem 15 Figure 1 4 2240 Functional Block Diagram...

Страница 16: ...ata and control auxiliary channels are sampled at 4 096 2 048 and 064 MHz respectively This mode is recommended for low data speed applications less than 128 kbps For the External Locked modes the com...

Страница 17: ...separates out the clock data and control lead signals as well as the supervisory information The supervi sory states are mainly routed to control status indicators while the remaining signals are rout...

Страница 18: ...1 Rack Chassis The 2240 modem can be used with most popular sizes of multimode and single mode optic cable including 50 125 62 5 125 and 8 10 125 NOTE When using 85 125 or 100 140 micron fiber optic c...

Страница 19: ...he unit file a liability claim immediately with the freight carrier 2 1 2 Standalone Modem Installation Installing the standalone version of the 2240 Modem is relatively straightforward It should be l...

Страница 20: ...th the PC board edge connector then push the Nylatch retainers in For each modem installed compatible communications cables and appropriate fiber optic cables terminated with the appropriate type conn...

Страница 21: ...third oscillator on the main 2240 board can be installed or changed to allow the use of Group 4 Internal Clock Rates Once the board is accessed notice the four pin socket located near the two standard...

Страница 22: ...on the rear panel of its enclosure The switch for the 2240 Rack Chassis is located at the rear of the PC card adjacent to the transmit optical connector The optical power switch provides two settings...

Страница 23: ...rough 6 provide the follow ing options Carrier Detect CD Signal Options 1 and 2 Clocking Options 7 and 8 External Clock Mode switch position 7 and the Divide Ratio Table Select switch position 8 are d...

Страница 24: ...al to track the state of the modem s optical receive synchronizer CD will assert when the modem is in local sync This also means that CD will track the state of the front panel Local Sync LED On expan...

Страница 25: ...for synchronous input If it is switched to ON any mode which sources Send Timing Internal or Slave will use a turned around clock coming in on Terminal Timing from the user s equipment This compensat...

Страница 26: ...ory Setting FLOAT 2 2 4 SCT Normal Invert Jumper This jumper allows the SCT output from the 2240 to be normal phase or inverted phase The purpose of this jumper is to allow compensation for round trip...

Страница 27: ...of the RS 530 interface there are no unused pins so a switch on the RS 530 interface is used to select the direction of the SCT leads refer to RS 530 interface section In a typical application see Fi...

Страница 28: ...als the extra clock input pins on the enhanced interfaces Extra clock jumper would have to be ON at this 2240 NOTE 2 Control lead crossovers are not shown for clarity NOTE 3 The 2240 in the diagram wo...

Страница 29: ...itches positions 5 6 and 7 on the front panel see Figure 3 1 Table 3 A lists the modes and the switch positions The switch positions are numbered from left to right 1 to 8 NOTE Front panel DIP switch...

Страница 30: ...lock Group 3 Rate 4 C C O Internal Clock Group 4 Rate 5 O C O Slave Clock 6 C O O Asynchronous up to 1 500 Mbps 7 O O O External Clock with Variable Lock Ratios refer to Table 3 B Frequency Limit assu...

Страница 31: ...h is used to send the clock signal which is sampled at 4 096 MHz One fourth of the composite bandwidth is used to send the data signal which is sampled at 2 048 MHz This sampling results in 244 nanose...

Страница 32: ...front panel DIP switch position 8 to select the LOW frequency ranges shown in Table 3 B is an enhancement feature added to the 2240 after mid summer 1996 Earlier versions of the 2240 do not have this...

Страница 33: ...ctive clock frequencies are given in Table 3 E If the rate appears in table choose the appropriate oscillator option for the modem Obtaining the desired divide ratio may require changing the position...

Страница 34: ...34 Canoga Perkins Table 3 E Standard Oscillator and Divide Factors...

Страница 35: ...that clock will be sent to the DTE on the Send Timing ST and Receive Timing RT or equivalent signal leads NOTE If the local loopback modem is operating in Mode 5 slave clock mode the remote device wi...

Страница 36: ...stomer s DCE does not support TT or equivalent lead a buffered interface may be needed to realign the data or the extra clock function may be used refer to Section 4 9 Canoga Perkins offers a wide sel...

Страница 37: ...ives back at the modem Since the modem uses its own clock signal to align the data there is a potential for these delays to make the data invalid at the point of re alignment This problem only occurs...

Страница 38: ...lock coming in on Terminal Timing from the user s equipment This compensates for round trip delays in the sourced clock which could other wise shift the clock data phasing of the transmit signal and c...

Страница 39: ...O W E R JU M P E R S E X PA N D E D IN TE R FA C E C O N N E C TO R N C N O ON OFF ON OFF STA N D A R D IN TE R FA C E C O N N E C TO R A U X IN TE R FA C E C O N N E C TO R H I LO W O P TIC S P O W...

Страница 40: ...40 Canoga Perkins This page is intentionally left blank...

Страница 41: ...ards Refer to Section 7 Specifications for applicable standards physical connector types Refer to Section 7 5 2240 Fiber Optic Modem Configurations for a list of available interface options In general...

Страница 42: ...odes Serial Clock Receive SCR is always the clock signal for the Receive Data Serial Clock Transmit External SCTE is the clock signal input used in External Clock Mode None of the control leads intera...

Страница 43: ...ivate the LOC or REM loop func tions Table 4 A RS 232D Pinouts Pin RS 232D Direction Number Pin Name abbrev Full Name 1 PG Protective Ground 2 TD Transmit Data to modem 3 RD Receive Data from modem 4...

Страница 44: ...NC ON or the state of the RTS signal at the far end main PCBA internal switch S1 CD DCD ON and CD SYNC OFF Refer to Section 2 2 2 1 for more information on the internal switch S1 CD DCD and CD SYNC po...

Страница 45: ...osition NOTE In the standalone model the 100_OHM position will only put a 100 Ohm resistor between the two grounds if the 2240 s main board SIGNAL GND jumper is set to the FLOAT position When installe...

Страница 46: ...ata to modem 5 23 ST send timing from modem 6 24 RD receive data from modem 7 25 RS request to send to modem 8 26 RT receive timing from modem 9 27 CS clear to send from modem 10 LL local loopback to...

Страница 47: ...trol signal outputs are unbalanced drivers conforming to the RS 423 Standard The B leads of any differential control signal outputs are tied to signal ground to comply with RS 422 None of the control...

Страница 48: ...S input at the far end In the CD jumper position the RR output will turn ON either when the modem s fiber optic receiver is in sync main PCBA internal switch S1 CD DCD OFF and CD SYNC ON or the far en...

Страница 49: ...osition will only put a 100 Ohm resistor between the two grounds if the 2240 s main board SIGNAL GND jumper is set to the FLOAT position When installed in the 2201 Rack Chassis any modem main board in...

Страница 50: ...for more informa tion on configuring the alarm contact input The TD RD SCT SCR and SCTE pins carry the primary data and clock signals conforming to the RS 449 and RS 422 standards In addition the SCT...

Страница 51: ...channel In addition the CTS A jumper allows configuring the CTS A output lead for cryptography applications refer to Section 4 4 8 CTS A Jumper Pin A B Signal Name Direction FG 01 Frame Ground TD 02...

Страница 52: ...nformation on the internal switch S1 CD DCD and CD SYNC positions Factory Setting CTRL 4 4 3 DSR Jumper The DSR jumper controls the behavior of the DSR signal The EIA position turns DSR OFF when the f...

Страница 53: ...tate of CTS when the local RTS is ON When the jumper is in the ON position CTS follows RTS only The CD position allows the 2240 s standard data interface signal CD to gate CTS In the CD jumper positio...

Страница 54: ...lanced driver whose output voltage swing is controlled by the KG_SWING jumper and whose sense is controlled by the KG_OUT jumper Factory Setting NORM 4 4 8 1 KG_SWING Jumper This jumper selects the ou...

Страница 55: ...imary data and clock signals conforming to the V 35 standard In addition an extra clock signal input is provided to make the 2240 436 combination more DTE like in tail circuit applications at the cloc...

Страница 56: ...R T 104 from modem Receiver Signal Element V X 115 from modem Timing DCE Source aka SCR Transmitted Data aka TXD P S 103 to modem Transmitter Signal Element Y AA 114 from modem Timing DCE Source aka...

Страница 57: ...n together to provide the most common handshake functions An input to RTS see description of RTS Bias jumper is transmitted to the DCD output at the other end of the link see description of DCD jumper...

Страница 58: ...e far end In the CD jumper position and with local RTS ON CTS will turn ON either when the modem s fiber optic receiver is in sync main PCBA internal switch S1 CD DCD OFF and CD SYNC ON or the state o...

Страница 59: ...hether chassis ground is connected directly to signal ground SHORT position or through a 100 Ohm resistor 100_OHM position NOTE In the standalone model the 100_OHM position will only put a 100 Ohm res...

Страница 60: ...tion to the network equipment over fiber optic cable The RS 449 interface can carry the Video Codec data with the control lead used for call set up The RS 423 interface can carry either serial RS 232...

Страница 61: ...MC1 Pin RS 449 Direction Number Pin Name A B abbrev full name 1 SHLD shield 4 22 SD send data to modem 5 23 ST send timing from modem 6 24 RD receive data from modem 7 25 RS request to send to modem...

Страница 62: ...extra clock signal is an enhancement added to 422 interfaces The 422 interfaces with this capability can be identified by their lack of the W16 W15 BAL_CTRL jumper The W16 W15 jumper was never describ...

Страница 63: ...SYNC ON or when the far end RTS is ON main PCBA internal switch S1 CD DCD ON and CD SYNC OFF Refer to Section 2 2 2 1 for more information on the internal switch S1 CD DCD and CD SYNC positions Factor...

Страница 64: ...rate for this interface is 9 6 kbps This interface is electrically compatible with EIA RS 423A It will also operate with asyn chronous RS 232D systems This interface uses the physical connector type...

Страница 65: ...und 2 TD Transmit Data to modem 3 RD Receive Data from modem 4 RTS Request to Send to modem 5 CTS Clear to Send from modem 6 DSR DCE Ready from modem 7 SG Signal Ground 8 DCD Receive Line Sig Det from...

Страница 66: ...etwork equipment over fiber optic cable The V 35 interface can carry the video Codec data with the control lead used for call set up The RS 423 interface can carry either serial RS 232 data or paralle...

Страница 67: ...ground references or control signals Transmit Data TXD and Receive Data RXD are the data input and output signals for the modem respec tively Serial clock Transmit SCT is the modem s transmit clock re...

Страница 68: ...15 from modem Timing DCE Source aka SCR Transmitted Data aka TXD P S 103 to modem Transmitter Signal Element Y AA 114 from modem Timing DCE Source aka SCT Transmitter Signal Element U W 113 to modem T...

Страница 69: ...s only included as a reference MC2 436 interfaces can be identified by the addition of a heatsink on the voltage regulator VR1 Table 4 L Pinout Differences MC2 435 vs MC2 436 4 6 2 1 1 RTS_BIAS Jumper...

Страница 70: ...signal CD to gate CTS In the CD jumper position and with local RTS ON CTS will turn ON either when the modem s fiber optic receiver is in sync main PCBA internal switch S1 CD DCD OFF and CD SYNC ON o...

Страница 71: ...will be experienced on these channels There are six end to end control lead pairs They are listed below with the input signal listed first TD to RD STD to SRD DTR to RI SRTS to SDCD DSRS to SCTS RTS t...

Страница 72: ...erface connectors and each is identified by the number at the end of the interface code of the order number refer to Table 4 N The connectors are female DA 15 4B1 four position terminal block 4B2 or t...

Страница 73: ...4 3 This interface will not inter operate with synchronous data interfaces if the T1 E1 is B8ZS or HDB3 Two jumper straps are provided for setting the line termination impedance to either 100 ohm for...

Страница 74: ...noga Perkins T1 2240 mode 7 2240 mode 5 Slave V 35 Rx Tx Data Clk Tx Data Clk Rx 4B1 436 Figure 4 2 Transparent Bipolar Interface Connectors Figure 4 3 Example of Link Between Bipolar and Clocked Inte...

Страница 75: ...se port for the Send Timing SCT and Terminal Timing SCTE clock signals A two position slide switch S1 on the interface card controls the port direction Figure 4 4 BNC Connectors When the switch is set...

Страница 76: ...ith the interface the DCE DTE adapter which converts the interface to the DTE form w Male DB 25 and the Legacy adapter which converts the interface to the original Model P2 interface This interface im...

Страница 77: ...labels affixed to the underside of the header The version included in the socket as shipped is P N 610030 001 see Figure 4 13 The P53 can be used to interface with encryption devices on the BLACK sid...

Страница 78: ...k Tx Data Modem Alarm From Fiber To Fiber Delay Line Inverter FIFO Data Out Data In Shift Out Shift I n Wire Wrap Header J3 W19 W20 8 SG FG CTS DSR RTS FIFO Clock SCTE TxD xD From Modem To Modem To Mo...

Страница 79: ...RSTBIAS OFF ON KG NORM W18 W17 W6 W5 W19 W20 Test GND DSR W16 W15 Dl1 Sw1 W10 W11 INVERT NORM KG OUT SW1 Position Delay Time O pen C losed P53 1 2 3 4 C C C C 20 ns O C C C 30 ns C O C C 40 ns O O C C...

Страница 80: ...configure the RLSD Output at J1 8 DB 25 to support the KG 194 Resync function ality Jumper straps W10 W11 adjacent to U11 and W12 W13 W14 adjacent to U8 implement this function refer to Table 4 Q and...

Страница 81: ...Data Tx Clock Tx Data Modem Alarm From Fiber To Fiber Delay Line Inverter FIFO Data Out Data In Shift Out Shift I n W19 W20 8 SG FG CTS DSR RTS FIFO Clock SCTE TxD xD From Modem To Modem To Modem 10 3...

Страница 82: ...n Figure 4 8 External Station Programmable Buffered Interface Model P53 DCE RS 530 Typical External Station Clock Application KG Swing Jumpers Internal Clock From Modem Rx Data Tx Clock Tx Data Modem...

Страница 83: ...s Internal Clock From Modem Rx Data Tx Clock Tx Data Modem Alarm From Fiber To Fiber Delay Line Inverter FIFO Data Out Data In Shift Out Shift I n W19 W20 8 SG FG CTS DSR RTS FIFO Clock SCTE TxD xD Fr...

Страница 84: ...Model P53 Figure 4 12 External Programmable Buff ered Interface Model P53 DCE RS 530 KG Swing Jumpers Internal Clock From Modem Rx Data Tx Clock Tx Data Modem Alarm From Fiber To Fiber Delay Line Inv...

Страница 85: ...lustrates the DCE to DTE pin assignments The gender of this adapter on the user side is male Figure 4 14 Programmable Buffered Interface Model P53 DTE PROGRAMMABLE BUFFERED INTERFACE MODEL P53 DCE RS...

Страница 86: ...ignments PROGRAMMABLE BUFFERED INTERFACE MODEL P53 DCE RS 530 LEGACY SG FG CTS 7 1 8 RLSD RS 423 RxD 3 16 17 9 SCR 15 12 SCT FIFO CLOCK 20 23 24 11 2 14 SCTE TxD 5 13 6 22 4 19 DSR RTS LL RL MODEM ALA...

Страница 87: ...ly as illustrated in Table 4 T The two interface types will communicate with each other but center tap ground jumpers E2 and E3 must be removed from a Mil Std 188 114C interface refer to Table 4 U The...

Страница 88: ...Model Characteristics TW RS 422A 4 TwinAx Figure 4 16 100 Ohms 100 Ohms 10 TW8 Mil Std 4 TwinAx Figure 4 16 100 Ohms 78 Ohms 10 118 114C T22 RS 422A 5 TwinAx Figure 4 17 100 Ohms 100 Ohms 10 T88 Mil...

Страница 89: ...10 W10 W10 W10 W10 W10 connected to signal ground W10 Not connected E2 TxD RCV termination N A IN N A IN N A IN resistor E3 SCTE RCV termination N A IN N A IN N A IN resistor center tap to shield grou...

Страница 90: ...ng the switch to the SCT position the port becomes an output providing the clock to the connected device When set for SCTE the port becomes an input and will accept a clock from the connected device S...

Страница 91: ...tors BJ 77 3 lug are used for the physical connection see Figure 4 17 4 10 5 Model D22 The signaling used on this interface is RS 422A A standard 37 position D type female connector DC 37 is used as...

Страница 92: ...92 Canoga Perkins Table 4 V Models D22 and D88 Connector Pin Assignments...

Страница 93: ...be removed by loosening the two retaining screws and nuts then pulling the board outward from its connector Once a replacement board is in position the two flanged lock nuts and screws are secured wit...

Страница 94: ...ector from the PC board and remove the two screws holding the rear panel in place The entire circuit board may now be removed by loosening the eight mounting screws The interface board may now be chan...

Страница 95: ...ation of a 2240 system The test modes can be activated by setting the Loopback switch on the front panel or by turning on the Local Loopback or Remote Loopback control leads in the electrical interfac...

Страница 96: ...ce of the local modem see Figure 5 1 NOTE If the local loopback modem is operating in Mode 5 slave clock mode the remote device will receive garbled data because of the overall timing configuration Th...

Страница 97: ...ance and continuity tests 2 Fiber Optic Power Meter should be calibrated atthe correct optical wave length with the appropriate optical connectors 3 A short one meter or less fiber optic jumper cable...

Страница 98: ...er from the modem and determine the optical receive power into this modem Reconnect the Rx fiber to the modem Repeat the above step for the modem at the other end and record both optical power levels...

Страница 99: ...r end user device Run the BERT test and go to the next step 6 Loopback test passes Modem not Verify correct but modems will not configured switch and strap pass data properly settings on modem and dev...

Страница 100: ...of less than the High Power Loss Budget refer to Table 6 A Set the optical power switch to LO Are you using a fiber optic link of more than the Low Power Loss Budget refer to Table 6 A Set the optica...

Страница 101: ...modate a zero loss link Wavelength 850 1310 or 1550 nanometers Fiber Optic Connector ST or FC type Fiber Optic Receiver 850nm standard PIN diode 1310nm Laser PIN InGaAs 1550nm Laser PIN InGaAs Transmi...

Страница 102: ...al connectors BJ 77 3 lug Transparent T1 E1 female DA 15 two female BNCs or Terminal strip Interfaces Supported RS 232D RS 423 RS 449 CCITT V 35 TTL BNC Programmable RS 422 P TwinAx 422 TwinAx MIL STD...

Страница 103: ...ctivity Local Remote Sync Loopback Active Power On Power Alarms 2201 Rack Only Controls 10 Local Remote Loopback Slide Switch Operating Mode DIP Switch Data Rate DIP Switch Hi Low Optic Power DIP Swit...

Страница 104: ...ER FC 21 1550nm HP LASER ST 23 1550nm HP LASER FC INTERFACE OPTIONS 432 EIA 423 EIA 232 DB 25 w Control 422 EIA 422 DC 37 w Control 430 EIA 530 DB 25 435 V 35 MRC 34 w Control Special Situations Only...

Страница 105: ...oods In the event Canoga Perkins breaches its obligation of warranty cus tomer sole and exclusive remedy is limited to replacement repair or credit of the purchase price at Canoga Perkins option A 2 D...

Страница 106: ...ipping charges to Canoga Perkins will be at customer s expense Units will be returned to the customer FOB origin Repaired units will be returned to the customer by standard ground shipment unless othe...

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