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Canoga Perkins 2240 User Manual

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Model 2240
Fiber Optic Modem
Users Manual

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  • Page 1 Model 2240 Fiber Optic Modem Users Manual...
  • Page 2 Canoga Perkins Caution! This product may contain a laser diode emitter operating at a wavelength of 1300 nm - 1600 nm. Use of optical instruments (for example: collimating optics) with this product may increase eye hazard. Use of controls or adjustments or performing procedures other than those specified herein may result in hazardous radiation exposure.
  • Page 3 Canoga Perkins and any unauthorized use or disclosure of such drawings, specifications and information is prohibited. Canoga Perkins reserves the right to change or update the contents of this manual and to change the specifications of its products at any time without prior notification. Every effort has been made to keep the information in this document current and accurate as of the date of publication or revision.
  • Page 4 Canoga Perkins Model 2240 Fiber Optic Modem...

  • Page 5: Table Of Contents

    2240 Fiber Optic Modem Table of Contents 1. Description ............ 11 1.1 2240 Modem ..............11 1.1.1 Functions, LEDs and Switches ..........12 1.2 2201 Rack Chassis ............13 1.3 2202 Modem Shelf ............13 1.4 2200R Series Redundant Card ........14 1.5 Modem Operation ............
  • Page 6 Canoga Perkins 3. Mode and Rate Selection ......29 3.1 Operating Mode / Data Rate Selection ..... 29 3.2 External Clock Modes ..........31 3.2.1 Sampled External Clock Mode - Mode 0 ....... 31 3.2.2 Locked External Clock Mode - Mode 7 ......... 32 3.3 Internal Clock Modes - Modes 1, 2, 3, 4 ....
  • Page 7 2240 Fiber Optic Modem 4.4.3 DSR Jumper ................52 4.4.4 CHASSIS_GND Jumper ............52 4.4.5 SCT Switch ................54 4.4.6 CTS_GATE Jumper .............. 54 4.4.7 CTS_OUT Jumper ..............54 4.4.8 CTS (A) Jumper ..............54 4.4.8.1 KG_SWING Jumper ............54 4.4.8.2 KG_OUT Jumper ...............
  • Page 8 5.2.1 Loopback Tests ..............95 5.2.2 Remote Loopback Test ............96 6. Diagnostic Procedures........97 6.1 2240 / 2201 Diagnostic Procedures ......97 6.1.1 Required Equipment ............. 97 6.2 Loopback Test Diagnostic Procedure ....... 98 6.3 Fiber Optic Diagnostic Procedure ......100 7.
  • Page 9 Extra Clock Pins in Tail Circuit Application at Clock Source End .... 28 2240 Front Panel Mode / Rate Switches ............29 Typical Tail Circuit Implementation .............. 36 RS-449 / 422 Null Cable Diagram for 2240 ............ 36 Location of Internal Switches and Jumpers ........... 39 Interchangeable Interfaces ................41 Transparent Bipolar Interface Connectors ............
  • Page 10 Canoga Perkins List of Tables 1-A Control Leads Available..............12 2-A Link Loss Range ................22 3-A Mode Switch Positions ..............30 3-B Locked External Rates ..............30 3-C Standard Internal Clock Rates ............. 31 3-D Group 4 Internal Clock Rate Divide Ratio ........33 3-E Standard Oscillator and Divide Factors ........

  • Page 11: Description

    Model 2240 Modem The 2240 modem operates at speeds from DC (0 bps) to 1.500 Mbps in asynchronous mode, 0 bps to 2.050 Mbps in synchronous mode (depending on the Rate and Mode selection refer to Section 3), including the common rates of 1.536 Mbps, 1.544 Mbps, and 2.048 Mbps.

  • Page 12: Functions, Leds And Switches

    Canoga Perkins Various configurations of the 2240 provide local and end-to-end modem controls including those listed in Table 1-A. Data / Clock Controls Send Data Request to Send Receive Data Clear To Send Table 1-A. Send Timing Data Set Ready...

  • Page 13: 2201 Rack Chassis

    The 2201 Rack Chassis (see Figure 1-2) is designed to accommodate up to ten 2200 series modems, except for the MC1 and MC2 interfaces. For the Model 2240 Modem with MC1 and MC2 interfaces, only five modems may be installed in the Rack Chassis.

  • Page 14: 2200R Series Redundant Card

    1.5 Modem Operation 1.5.1 General The 2240 Modem can use an external clock, provide the master clock, or one end can be slaved to the other for either of these cases. The electrical connection between the data equipment and the 2240 Modem differs from model to model depending on which interface is employed (modem is usually DCE).

  • Page 15: 2240 Functional Block Diagram

    2240 Fiber Optic Modem Figure 1-4. 2240 Functional Block Diagram...

  • Page 16: System Test And Diagnostics

    16 microseconds of pulse distortion due to sampling. The composite speed of the 2240 Modem varies between 4.1 and 8.2 Mbps, depend- ing on the selected mode of operation. A detailed description of mode selection is to be found in Section 3.

  • Page 17: Receive Section

    1.5.6 Expanded Interface Auxiliary Channels The 2240 has five Auxiliary Channels. One of these channels is available on the expanded interface connector and the other four on the Auxiliary Interface Connector (see Figure 3-4). The MC1 and MC2 interfaces make use of all eight control and...

  • Page 18: Fiber Optics

    The connectors are clearly marked as to their function, either Transmit (Tx) or Receive (Rx), on the back panel of the 2240 standalone units, and on the rear of the 2201 Rack Chassis. The 2240 modem can be used with most popular sizes of multimode and single mode optic cable;...

  • Page 19: Installation And Setup

    2240 Fiber Optic Modem 2. Installation and Setup 2.1 Installation Installation for the 2240 Fiber Optic Modem includes unpacking the unit, and considerations for installing the standalone and rackmount models. 2.1.1 Unpacking the Unit Each 2240 Modem is shipped factory tested, and packed in protective cartons.

  • Page 20: Rack-Mount Modem Installation

    Transmit (Tx) at the remote modem. The connectors are clearly marked as to their function, either Transmit (Tx) or Receive (Rx) on the back panel of the 2240 standalone units. Figure 2-1 is shown with the V.35 Interface.

  • Page 21: 2202 Modem Shelf Installation

    Modem Shelf User Manual for more information about installation. 2.1.6 Custom Oscillator Installation The 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 oscillators (see Figure 2-2).

  • Page 22: Setup

    DIP switch for varying the transmit power of the fiber optic LED or Laser (see Figure 2-1). Both sections of the switch must be set the same. The switch for the 2240 standalone is located 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.)

  • Page 23: Eight-Position Internal Options Dip Switch

    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) •...

  • Page 24: Internal Control Switches

    Canoga Perkins 2.2.2.1 Carrier Detect (CD) Signal Options There are two switches on the internal switch block which control the response of the CD signal on the Standard Data Interfaces. These switches operate as a pair and only one switch should be set to ON at any time.

  • Page 25: Internal Clock Option Switches

    2240 Fiber Optic Modem 2.2.2.2 Internal Clock Option Switches There are two switches on the Internal switch block which affect the operation of the Clock circuits: • TBL / NORM • CLK / EXT 2.2.2.2.1 TBL / NORM Switch The TBL / NORM switch controls the Data Rate Table as indicated in Table 3-D.

  • Page 26: Signal Ground Strap

    2240 samples TXD at the SCT A lead FALLING edge. In the INV (invert) position the 2240 samples TXD at the clock edge opposite of the appropriate standards, i.e., the 2240 samples TXD at the SCT A lead RISING edge.

  • Page 27: Extra Clock Jumper

    2.2.5 EXTRA CLOCK Jumper This two-pin jumper (W26, labeled XTCLK), in conjunction with the enhanced interfaces (- 422, - 436 and - 430), allows the 2240 to accept BOTH customer clocks for tail circuit applications. Refer to the RS-449, V.35 and RS-530 interface sections for more information on the enhanced interfaces.

  • Page 28: Extra Clock Pins In Tail Circuit Application At Clock Source End

    NOTE 2: Control lead crossovers are not shown for clarity. NOTE 3: The 2240 in the diagram would be operating in Mode 7, with rate set to match CSU / DSU speed. The 2240 at far end would be operating in...

  • Page 29: Mode And Rate Selection

    3. Mode and Rate Selection 3.1 Operating Mode / Data Rate Selection The 2240 has eight clock operating modes: seven modes for synchronous data transmission and one asynchronous mode. Each synchronous mode is character- ized by one of three transmit clock types: External Clock (clocked from customer's equipment), Internal Clock (modem generates Tx clock and RX clock) and Slave Clock (transmit clock same as received from far-end modem).

  • Page 30: A Mode Switch Positions

    Canoga Perkins DIP Switches (C) Closed (O) Open Mode Operating Mode Sampled External Clock up to 1.544 Mbps * Internal Clock Group 1 Rate Table 3-A. Internal Clock Group 2 Rate Mode Switch Internal Clock Group 3 Rate Positions Internal Clock Group 4 Rate Slave Clock Asynchronous up to 1.500 Mbps *...

  • Page 31: External Clock Modes

    The external clock modes are used when it is necessary to have the DTE provide the transmit clock or when the 2240 is used as a tail circuit connecting to a DCE. In these modes, the DTE or DCE sends this clock to the modem on the Terminal Timing (TT) or equivalent signal leads.

  • Page 32: Locked External Clock Mode - Mode 7

    In the Locked mode, the entire transmitter section of the 2240 is locked to the clock provided by the DTE. The Locked mode is always used for T1 (1.544 Mbps), E1 (2.048 Mbps), any synchronous data transmission between 1.490 Mbps and 2.060 Mbps and possibly at lower speeds if the...

  • Page 33: Standard Internal Clock Rates (Groups 1, 2 And 3)

    2240 Fiber Optic Modem DIP Switches (C) Closed (O) Open Group 4 Divide Ratios Rate Switches Normal and Alternate Table Rate NORM (ON) * TBL (OFF) Table 3-D. Group 4 Internal Clock Rate Divide Ratio 1536 3072 6144 * Factory setting In Group 4, the Rate Switches select the divider ratio for this oscillator.

  • Page 34: E Standard Oscillator And Divide Factors

    Canoga Perkins Table 3-E. Standard Oscillator and Divide Factors...

  • Page 35: Slave Clock Mode - Mode 5

    The only exception to this is when the signal is bipolar T1 or E1. For those signals, the 2240 interface extracts a clock from the signal. This mode samples the data signal at 4.096 MHz which results in a pulse distortion of 244 ns.

  • Page 36: Typical Tail Circuit Implementation

    RS-449 / 422 Null Cable Diagram for 2240 NOTE: If the customer'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...

  • Page 37: Consideration Of Propagation Delays

    ST to TT leads at the DTE end of the cable (if the DTE does not do this by default). NOTE: The 2240 can be made to use the TT signal for realigning the data by turning ON the CLK / EXT switch on the main board. This switch is position 7 of the internal options switches, as illustrated in Figures 2-3 and 3-4.

  • Page 38: Internal Clock Option Switches

    Canoga Perkins 3.7 Internal Clock Option Switches There are two switches on the Internal switch block which affect the operation of the Clock circuits: TBL / NORM and CLK / EXT (see Figures 2-3 and 3-4 for the locations of these switches).

  • Page 39: Location Of Internal Switches And Jumpers

    2240 Fiber Optic Modem Figure 3-4. Location of Internal Switches and Jumpers Factory Settings are Illustrated...
  • Page 40 Canoga Perkins This page is intentionally left blank.

  • Page 41: Data Interfaces

    2240 Fiber Optic Modem 4. Data Interfaces 4.1 Data Interfaces Overview A variety of interfaces are available for the 2240 Modem (see following listing). RS-423 / 232 CCITT V.35 RS-449 Transparent T1 / E1 RS-449 / RS-423 (MC1) CCITT V.35 / RS-423 (MC2)

  • Page 42: 232D Model 432

    Canoga Perkins 4.2 RS-423 / 232D Model 432 NOTE: The maximum data rate for this interface, 153.6 kbps, is limited by the interface driver slew rate. This interface is electrically compatible with EIA RS-423A. It will also operate with RS-232D systems when adhering to the more limiting RS-232D specifica- tions (20 kbps and 2500 pF cable capacitance).

  • Page 43: A Rs-232D Pinouts

    Local Loopback (LL) and Remote Loopback (RL) are loopback control leads and perform the same functions as the 2240 front panel LOOP switch LOC and REM positions. LL and RL are interface signal inputs which can be used to activate the LOC or REM loop func-...

  • Page 44: Rts_Bias Jumper

    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 position and with local RTS ON, CTS will turn ON either when the modem's fiber optic...

  • Page 45: Dsr Jumper

    This condition exists when the far-end 2240 modem has a local loopback active. The TEST position causes DSR to turn OFF (negate) whenever any loopback is active at one or both modems.

  • Page 46: B Rs-449 Pinouts

    Canoga Perkins RS-449 Direction Number PIN Name (abbrev) (full name) SHLD shield 4/22 send data to modem 5/23 send timing from modem 6/24 receive data from modem 7/25 request to send to modem 8/26 receive timing from modem 9/27 clear to send...
  • Page 47 Receive Timing (RT) is the clock signal for the receive data unless the 2240’s main PCBA W26 (XTCLK) jumper is ON, in which case the Extra Clock input signal is used to shift receive data out from the 2240 (refer to Section 2.2.6).

  • Page 48: Rs_Bias Jumper

    Local Loopback (LL) and Remote Loopback (RL) are loopback control leads and perform the same functions as the 2240 front panel LOOP switch LOC and REM positions. LL and RL are interface signal inputs which can be used to activate the LOC or REM loop functions.

  • Page 49: Dm Jumper

    The DM jumper controls the behavior of the DM signal. The EIA position turns DM OFF when the far-end 2240 modem has a local loopback active. The TEST position causes DM to turn OFF whenever any loopback is active at one or both modems.

  • Page 50: Interface Model 430

    (conforming to RS- 422) to make the 2240 / -430 combination more DTE-like in tail circuit applications at the clock source (refer to Section 2.2.6). The remainder of the pins are either ground references or control signals.

  • Page 51: C Rs-530 Signals And Pin Assignments

    2240 Fiber Optic Modem Signal Name Direction Frame Ground 02/14 Transmit Data to modem 03/16 Receive Data from modem 04/19 Request to Send to modem 05/13 Clear to Send from modem 06/22 Data Set Ready from modem Signal Ground 08/10...

  • Page 52: Rts_Bias Jumper

    The DSR jumper controls the behavior of the DSR signal. The EIA position turns DSR OFF when the far end 2240 has a local loopback active. The TEST position causes DSR to turn OFF whenever any loopback is active at one or both of the modems.

  • Page 53: Sct Switch

    This jumper selects the source of the CTS output signal. In the CTS position, CTS provides the local CTS function (refer to Section 4.4.6, "CTS_GATE Jumper") In the RI position, the CTS tracks the state of the DTR input at the far end 2240. Factory Setting = CTS...

  • Page 54: Cts_Gate Jumper

    KG position. Refer to Table 4-D. CTS (A) KG_OUT KG_SWING CTS (A) lead CTS (A) lead when DTR is when DTR is asserted at negated at far end 2240 far end 2240 NORM +6V_GND Table 4-D. NORM +6V_-6V Settings For the NORM -6V_GND...

  • Page 55: Ccitt V.35 (Iso 2593-1993) Model 436

    (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 clock source end (refer to Section 2.2.6). The remainder of the pins are either ground references or control signals.

  • Page 56: E Ccitt V.35 Pinouts

    Extra Clock for Receive Data FF/DD* to modem NOTE 1: The 2240 connects the Shield pin to chassis ground. * These pins carry signals which are not defined by V.35 or ISO 2593-1993. If a straight-through cable is used, verify compatibility of this pin usage...

  • Page 57: F Pinout Differences (-435 Vs. -436)

    2240 Fiber Optic Modem NOTE: The previous V.35 interface, Model -435, did not conform to the ISO 2593 pinout and was the predecessor to the -436 interface. The signals listed in Table 4-F have different pinouts on the -435 versus the -436. The -435 also did not support the Extra Clock for the receive data signal.

  • Page 58: Rts_Bias Jumper

    Local Loopback (LL) and Remote Loopback (RL) are loopback control leads and perform the same functions as the 2240 front panel LOOP switch, LOC and REM positions. LL and RL are interface signal inputs which can be used to activate the LOC or REM loop functions.

  • Page 59: Dsr Jumper

    The DSR jumper controls the behavior of the DSR signal. The CCITT turns DSR OFF when the far-end 2240 modem has a local loopback active. The TEST position causes DSR to turn OFF (negate) whenever any loopback is active at one or both modems.

  • Page 60: Multi-Channel Interfaces

    Video Codec data with the control lead used for call set up. The RS-423 interface can carry either serial RS-232 data or parallel RS-366A data for the dialing equipment, when used with the appropriate RS-366A adapter (2240- 366-ACE or 2240-366-DTE) or equivalent cables.

  • Page 61: Dc-37 Interface

    2240 Fiber Optic Modem 4.6.1.1 RS-449 / DC-37 Interface This interface complies with EIA Standard RS-449. Electrical characteristics comply with RS-422 for clock and data signals and RS-423 for control signals. The interface uses the physical connector type and pinouts specified in RS-449 (refer to Table 4- H).
  • Page 62 (conforming to the RS-449 and RS-422 standards). In addition, an extra clock signal input (conforming to RS-422) is provided to make the 2240 / -422 combi- nation more "DTE-like" in tail circuit applications at the clock source end (refer to Section 2.2.6).

  • Page 63: Rs_Bias Jumper

    ON position, CTS follows RS only. The CD position allows the 2240's standard data interface signal CD to gate CS. In the CD jumper position and with local RS ON, CS will turn ON either when the modem's fiber optic receiver is...

  • Page 64: Ch_Gnd Jumper

    100 Ohm resistor (100_OHM position). 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.

  • Page 65: I Rs-423 Pinouts For Model Mc1

    2240 Fiber Optic Modem There are six end-to-end control lead pairs. They are listed with the input signal listed first. TD to RD STD to SRD DTR to RI SRTS to SDCD DSRS to SCTS RTS to DCD RS-232 Direction...

  • Page 66: Rs-423 Model Mc2

    Codec data with the control lead used for call set up. The RS-423 interface can carry either serial RS-232 data or parallel RS-366A data for the dialing equipment when used with the appropriate RS-366A adapter (2240-366-ACE or 2240- 366-DTE) or equivalent cabling.

  • Page 67: Ccitt V.35 / Mrc 34 Interface

    (conforming to the V.35 standard). In addition, an extra clock signal input is provided to make the 2240 / -MC2 combination more "DTE-like" in tail circuit applications at the clock source end (refer to Section 2.2.6). The remainder of the pins are either ground references or control signals.

  • Page 68: K Ccitt V.35 Pinouts For Mc2

    If a straight-through cable is used, verify compatibility of this pin usage with the customer's equipment. NOTE 1: The 2240 connects the Shield pin to chassis ground. NOTE 2: The extra clock signal is an enhancement added to -MC2 interfaces.

  • Page 69: Rts_Bias Jumper

    2240 Fiber Optic Modem The previous V.35 interface Model MC2 / 435, did not conform to the ISO 2593 pinout and was the predecessor to the MC2 / 436 interface. The MC2 / 436 went into production during mid-summer 1996. The signals listed in Table 4-L have different pinouts on the MC2 / 435 versus the MC2 / 436.

  • Page 70: Dcd Jumper

    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 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 /...

  • Page 71: Rs-423 / Db-25 Interface

    2240 Fiber Optic Modem 4.6.2.2 RS-423 / DB-25 Interface NOTE: The maximum data rate for this interface is 9.6 Kbps. This interface is electrically compatible with EIA RS-423A. It will also operate with asynchronous RS-232D systems. This interface uses the physical connector type and pinouts specified in RS-232D (refer to Table 4-I).

  • Page 72: M Configuration Switch Settings

    Canoga Perkins There are three different types of interface 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);...

  • Page 73: N Transparent Bipolar Line Interfaces

    "1's" AMI stream if the end-to-end line is interrupted at any point. When using any of the Transparent Bipolar Interfaces, the 2240 modem rate and mode front panel DIP switches should be set as follows: 1-4 = closed, 5-7 = open (Rate 0, Mode 7).

  • Page 74: Transparent Bipolar Interface Connectors

    Canoga Perkins Figure 4-2. Transparent Bipolar Interface Connectors 2240 (mode 7) Figure 4-3. Example of Link 2240 Between Bipolar (mode 5 and Clocked Slave) Interface Data Clk Tx V.35 Data Clk Rx...

  • Page 75: Ttl / Bnc Interface Model -Bn

    2240 Fiber Optic Modem 4.8 TTL / BNC Interface Model -BN This model uses BNC (bayonet) connectors for the physical interface. The electrical signal characteristics are unbalanced TTL levels, with only the clock and data circuits supported. Four BNC connectors are supplied for connection to a DTE device.

  • Page 76: Programmable Buffered Interface / Model P53

    Canoga Perkins Signal Full Name Direction Transmit Data To Modem Table 4-O. Receive Data From Modem BNC Supported Serial Clock Receive From Modem Signals Serial Clock Transmit From Modem SCTE External Clock Transmit To Modem 4.9 Programmable Buffered Interface / Model P53 The Model P53 Interface Module complies with EIA Standard RS-530 while all clock, data and control signals follow the RS-422 standard.
  • Page 77 2240 Fiber Optic Modem A wire wrap header (J3) provides the means to interconnect these resources together with the standard modem transmit and receive circuits to perform the intended function. Figure 4-5 illustrates how the resources are tied into the J3 header.
  • Page 78 Canoga Perkins KG Swing Jumpers FIFO Modem Data Out Data In Alarm Shift Out Shift I RLSD From Rx Data Fiber Inverter Figure 4-5. Available Strapping Delay FIFO Line Options for Clock Programmable Internal Buffered Interface SCTE Clock From Modem...

  • Page 79: Board Layout For Programmable Buffered Interface

    2240 Fiber Optic Modem SW1 Position Delay Time (O)pen (C)losed 20 ns 30 ns 40 ns Table 4-P. O O C 50 ns Delay Times for 60 ns Programmable 70 ns Buffered Interface O O C 80 ns O O O C...

  • Page 80: Jumper Settings

    Canoga Perkins Jumper Description Notes Factory Setting W1 / W2 Chassis Ground W1 - 100 ohms / W2 - Short W1 Default W5, W6, W7 RCVR Terminations All Out W8 / W9 Legacy Config. Both Out Table 4-Q. W10 / W11...

  • Page 81: Generic Interface

    2240 Fiber Optic Modem 4.9.2 Generic Interface Figure 4-7 illustrates basic DCE configurations, which bypass all the "feature" circuits provided by the P53 Interface. PROGRAMMABLE BUIFFERED INTERFACE MODEL P53, GENERIC DCE RS-530 P/N 6100030-006 KG Swing Jumpers FIFO Modem Data Out...

  • Page 82: External Station

    Canoga Perkins 4.9.3 External Station The External Station is used when an external station clock is providing timing (see Figures 4-8 and 4-9). When connecting KG or KIV encryptors together on the Black side, using an external timing device you should install the external station clock strapped header in the J3 position.

  • Page 83: Internal

    2240 Fiber Optic Modem 4.9.4 Internal The internal function is used when network equipment is set for Eternal Timing (see Figures 4-10 and 4-11). When connecting KG or KIV encryptors together on the Black side, you should install the internal strapped header in the J3 position. In this applica- tion, the modems are acting as the network timing source.

  • Page 84: External

    Canoga Perkins 4.9.5 External The External function is used when network equipment is set for Network or Inter- nal Timing (see Figures 4-12 and 4-13). When connecting KG or KIV encryptors on the Red side to a DTE device, you should install the external strapped header in the J3 position.

  • Page 85: Dte Adapter

    2240 Fiber Optic Modem 4.9.6 DTE Adapter This adapter is supplied with the P53 interface and should be used when connecting to a DCE device. This allows the use of a straight-through RS-530 cable. Figure 4-14 illustrates the DCE to DTE pin assignments. The gender of this adapter on the user side is male.

  • Page 86: Legacy Adapter

    Canoga Perkins 4.9.7 Legacy Adapter This adapter is provided with the P53 interface and should be used if preexisting cabling was installed for use with Model P2 interface cards (see Figure 4-15). This adapter converts the standard RS-530 pin assignment on the P53 back to the original P2 pin assignments.

  • Page 87: High-Speed Rs-422 / Mil-Std 188-114C

    High-Speed Mil-Std 188-114C interface models (TW8, T88 and D88) available. All can operate up to 20 Mbps (2240 limited to 2.048 Mbps). All support only clock and data signals as shown in Table 4-R. Both the RS-422A and Mil-Std 188- 114C are balanced differential electrical signals.

  • Page 88: T Model Characteristics

    Canoga Perkins Model Electrical Physical Physical Driver Termination Interface Interface Interface Impedance Impedance Type Type Figure / Table 100 Ohms ±10% RS-422A 4 TwinAx Figure 4-16 <100 Ohms 78 Ohms ±10% Mil-Std 4 TwinAx Figure 4-16 <100 Ohms 118-114C 100 Ohms ±10%...

  • Page 89: U Jumper Strap Options

    External Clock above 9 Mbps. ** The W5 / W6 jumper option serves the same function as the SCT Normal / Invert Jumper on the main 2240 board. Either one may be used to invert SCT. Refer to Section 2.2.5 for details.

  • Page 90: Model Tw8

    Canoga Perkins 4.10.2 Model TW8 The signaling used on this interface is Mil-Std 188-114C. Four TwinAx connec- tors (BJ-77, 3-lug) are used for the physical connection (see Figure 4-16). A switch is provided to select whether the fourth TwinAx (SCT / SCTE) is to be used as an output (SCT) or as an input (SCTE).

  • Page 91: Model T22

    2240 Fiber Optic Modem 4.10.3 Model T22 The signaling used on this interface is RS-422A. Five TwinAx connectors (BJ-77, 3-lug) are used for the physical connection (see Figure 4-17). 4.10.4 Model T88 The signaling used on this interface is Mil-Std 188-114C. Five TwinAx connec- tors (BJ-77, 3-lug) are used for the physical connection (see Figure 4-17).

  • Page 92: V Models D22 And D88 Connector Pin Assignments

    Canoga Perkins Table 4-V. Models D22 and D88 Connector Pin Assignments...

  • Page 93: Interface Reconfiguration

    2240 Fiber Optic Modem 4.11 Interface Reconfiguration Figure 4-18 illustrates how the interface circuit board fits into the larger main modem board opening. A header-type connector is provided to connect the two circuit boards together. The interface board may be removed by loosening the two retaining screws and nuts, then pulling the board outward from its connector.

  • Page 94: Standalone Reconfiguration

    Canoga Perkins 4.12 Standalone Reconfiguration To access the circuit board on a standalone unit, the enclosure cover must first be removed by loosening the six screws on the sides of the unit. Next, unplug the power supply connector from the PC board, and remove the two screws holding the rear panel in place.

  • Page 95: Troubleshooting

    The following procedures are intended for use in the event of a system failure, not during the initial installation of a 2240 optical link. For initial installation checkout, refer to Section 1.7 of this manual. Also, refer to Section 6 for detailed diagnostics.

  • Page 96: Remote Loopback Test

    Canoga Perkins NOTE: Interface control of the loopback tests is only supported on the following modular interfaces: RS-423 / RS-232C, RS-449, RS-530 and V.35. When activated, the Local Loopback test will cause all data transmission from the near end (local) user device to be looped back toward the receive of that same device. The data from the remote user device will not loop back (it will continue receiving data from the local device), but the Loop On indicator at the far end turns on.

  • Page 97: Diagnostic Procedures

    2240 Fiber Optic Modem 6. Diagnostic Procedures 6.1 2240 / 2201 Diagnostic Procedures The following diagnostic procedures should be followed to test the 2240 system, troubleshoot a defective link or detect a defective fiber optic cable, connector, modem or power supply.

  • Page 98: Loopback Test Diagnostic Procedure

    (one is externally locked and the other is slave), verify that the externally locked 2240 has a clock on its TT (or equivalent) leads that matches its rate switch. Verify the optical cable loss. Remove the Tx fiber from the modem. Use the optical power meter and fiber optic jumper cable to determine the optical launch power for this modem.
  • Page 99 2240 Fiber Optic Modem Step Symptom Possible Cause(s) Action Cable loss exceeds Defective Repair or modem loss budget. F/O cable replace defective cable Cable loss exceeds Defective Fiber Repolish or modem loss budget. Optic Connectors replace defective connector Set the Remote Loopback switch on the near-end modem. Set up BERT tester for the proper clocking, data rate and format as used with the circuit.

  • Page 100: Fiber Optic Diagnostic Procedure

    There also may be a data rate incompat- ibility. If this check out of the electrical and optical links provides no indication as to the problem, contact Canoga Perkins Installation and Repair Department for as- sistance.

  • Page 101: Specifications

    2240 Fiber Optic Modem 7. Specifications 7.1 Optical Interface Composite Error Rate: 1 in 10 or better Fiber Optic Cable Compatibility: 50 and 62.5 micron Multimode or 8 to 10 micron Single Mode fiber Transmitter: LED (850nm) Laser diode (1310nm or 1550nm)

  • Page 102: System Electrical

    Canoga Perkins TYPICAL LAUNCH POWER AND Rx SENSITIVITY LAUNCH POWER (dBm) OPTIC TYPE Rx SENS. (dBm) Table 7-A. Launch Power and 850 LED -15±2 -20±4 Rx Sensitivity 1310 LP LASER -15±2 -15±2 1310 / 1550 HP LASER -5±1 -14±2 7.2 System Electrical...

  • Page 103: Indicators And Controls

    2240 Fiber Optic Modem Power Requirement: Standalone 115 VAC +10% @ 0.22 Amps 115/230 VAC + 10% switchable @ 0.11 Amps ,47 to 63 Hz -48VDC; 0.5 Amps (max) Rack Mount PC Card 18 VAC +10% @ 1.1 Amps per board 50 to 64 Hz 7.3 Indicators and Controls...

  • Page 104: 2240 Fiber Optic Modem Configurations

    NO CRYSTAL The 2240 Fiber Optic Modem provides most standard clock rates with built in oscillators. If a non-standard internal clock rate is required, refer to Section 3.3, or call Canoga Perkins and ask for Applications Support. FIBER OPTIONS MULTIMODE (STANDARD)

  • Page 105: Appendix A Limited Warranty

    Limited Warranty Products Canoga Perkins warrants that, at the time of sale, its products will be free from defects in material and workmanship, and if properly installed and used will substantially conform to Canoga Perkins' published specifications. Subject to the conditions and limitations set forth below, Canoga Perkins will, at its opinion, either repair or replace any part of its product(s) that prove defective by use of improper worksmanship or materials.
  • Page 106 Shipping 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 otherwise specified, with any additional costs for customer specified expe- dited delivery at the customer’s expense.

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