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47

2270 Fiber Optic Modem

Chapter 4  -  Modem  Operation

4.1  Modem Operation

Though the actual electronic connection between the data equipment interface and a 2270 Modem

differs from model to model, the electronic conversion from voltage level to optical level is similar in

all applications. Figure 4-1 provides a functional block diagram of a typical 2270 Modem. (For

simplicity, the test circuits are not shown.) The internal clock is shown with a broken line. The

modem is shipped from the factory set to use the external clock. The optional clock may be

selected via front panel switches at the time of installation.

Figure 4-1.

2270 Circuit

Board Diagram

4.2  Fiber Optics

Since light is the transmission medium being used between modems, there are other advantages

over conventional copper wire. In effect, most problems normally associated with large, multicon-

ductor cables are eliminated. These include not only interface distance, but also grounding prob-

lems, Electromagnetic Interference (EMI), Radio Frequency Interference (RFI), and signal radia-

tion. This latter factor is of particular importance where security of the system is important, and for

compliance with FCC compatibility regulations.

Содержание 2270

Страница 1: ...M o d e m s Canoga Perkins 2270 Fiber Optic Modem User Manual...

Страница 2: ...te 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 a...

Страница 3: ...e hazard Use of controls or adjustments or performing procedures other than those specified herein may result in hazardous radiation exposure Under normal conditions the radiation levels emitted by th...

Страница 4: ...mper Settings 13 1 12 Mean Time Between Failures MTBF 13 Chapter 2 Installation 16 2 1 Unpacking the Unit 16 2 2 Standalone Modem Installation 16 2 3 2202 Modem Shelf Installation 16 2 4 Fiber Cable a...

Страница 5: ...4 2 Fiber Optics 47 4 3 Transmit Section 48 4 4 Receive Section 48 4 5 Full RateAgility 48 4 6 Bit Count Integrity 49 4 7 Duty Cycle Tolerance 49 4 8 Control Signals 49 4 8 1 Flow Control 50 Chapter...

Страница 6: ...RS 530 38 3 8 External Programmable Buffered Interface Model P53 39 3 9 ProgrammableBufferedInterface ModelP53 DTE 40 3 10 Programmable Buffered Interface Model P53 LegacyAdapter 41 3 11 BNC and FourT...

Страница 7: ...Interfaces 24 3 C RS 449 RS 422 Signals and Pin Assignments 25 3 D RS 530 Signals and Pin Assignments 26 3 E RS 530 Jumper Options 27 3 F Transparent BipolarLine Interfaces 28 3 G Line Build Out Setti...

Страница 8: ...of end to end control lead operation is also available refer to Section 4 8 1 2 Functions LEDs and Switches The 2270 standalone modems do not have an on off switch since they power up when plugged in...

Страница 9: ...rnate loopback mode as shown in Table 5 A of the Troubleshooting section Indicator lights are provided for Power On Optical Receive and Transmit data activity Interface Receive and Transmit data activ...

Страница 10: ...uses three slots of the 2201 Rack Chassis It enables a user to incorporate a fully redundant fiber optic link with 2270 Modems The combination of the three boards provides redundant operation for data...

Страница 11: ...0 Mbps data rate 1 8 Optical Bandwidth The 2270 requires nearly 70 MHz of optical bandwidth As a result the specified fiber optic cable must provide this bandwidth at the required distance For example...

Страница 12: ...dB The HI switch setting is intended for longer cable runs up to the maximum power loss budget 1 10 2 Sensitivity Switch HPLaser Version Only The Sensitivity Switch RX SENS provides two settings for...

Страница 13: ...not guaranteed outside of these limits 1 11 Switch and Jumper Settings See Figure 1 2 for the location of specific switches and jumpers Tables 1 C and 1 D summarize the functions of the 2270 s switch...

Страница 14: ...The position of this switch is dependent on both the loss of the Rx link and the position of the Tx optical power switch on the modem at the other end CLOCK RATE switches on Front Panel described in S...

Страница 15: ...k to be activated and Remote Loopback control OFF defeats pattern loopback for System Test and disables any Remote Loopbacks Factory Setting ON ALT A and ALT B allow alternate loopback methods to be s...

Страница 16: ...for the standalone is a wall type transformer It should be plugged into a standard AC wall outlet that incorporates a ground line A POWER ON switch is not provided as the modem is powered when the uni...

Страница 17: ...Tx or Receive Rx on the rear panel of the 2270 standalone units and on the rear of the 2201 Rack Chassis NOTE Keep all connectors free of water dust and dirt Cover them and the cable ends with plasti...

Страница 18: ...ons Asynchronous operation is accomplished by setting the modem to Internal Mode and oversampling the data refer to Section 2 7 2 Internal Clock Operation The operating mode is selected by setting pos...

Страница 19: ...e SCT suppressed NORM O C X Slave Clock Mode SCT Receive Clock X DIP switch position 6 is don t care INV O C X Slave Clock Mode SCT Receive Clock Inverted NORM C C X Slave Clock Mode SCT returned on E...

Страница 20: ...vice versa it may be necessary to make an oscillator change on the main modem circuit board Table 2 B lists the standard oscillators or you may contact the factory for application assistance 2 7 6 Sla...

Страница 21: ...o compensate for the delay Table 2 B Data Rate Switch Position vs Oscillator Part Number Oscillator Part Numbers C losed O pen M megabits K kilobits Switch Setting 2200 C 01 2200 C 02 2200 C 03 2200 C...

Страница 22: ...too close to the data transitions the INV position must be used NOTE This will not change the SCT to TXD phase relationship viewed on the interface but will compensate for the phasing problem 2 7 7 2...

Страница 23: ...rate EIA standard RS 423 does not reference physical connector type or pinouts This RS 423 interface uses the physical connector type and pinouts specified in RS 232C refer to Table 3 A The RS 232C 42...

Страница 24: ...Transmit ST 114 from modem 17 SCR Serial Clock Receive RT 115 from modem 182 RT Remote System Test to modem 24 SCTE Tx External Clock T T 113 to modem 1 Only Local Handshake is supported 2 The 2270 Mo...

Страница 25: ...del 22 Request To Send is held low when there is no connection or the interface connection is removed c Model H22 Request To Send is held high when the user s device does not supply an RS input or the...

Страница 26: ...al Receive Carrier Detect If CD is not valid or power is lost the relay is in the alarm state A jumper RLY controls the selection of either the open or closed state This is a three contact jack The al...

Страница 27: ...y if testing is being conducted through the interface Factory Setting TEST CTS GATE Jumper ON position CTS Clear to Send is asserted after a delay from RTS Request to Send CD position CTS also needs t...

Страница 28: ...erface must be used NOTE This interface is not compatible with any other type of interface If compatibility with either DS1 T1 interfaces or clock and data interfaces is necessary the DS1 T1 must be u...

Страница 29: ...9 533 FT OFF ON OFF OFF OFF 533 655 FT CSU OFF ON ON ON OFF PART 68 OPT A OFF ON OFF ON OFF T1C1 2 These interfaces are fully transparent to line codes such as B8ZS or HDB3 Three DIP switches 3 4 and...

Страница 30: ...aperture under the terminal screw Tightening the terminal screw clamps the wire in position An access hole for a diagnostic probe is provided above the clamping screw NOTE When using the DS1 T1 interf...

Страница 31: ...munications handshake refer to Table 3 H for pinouts NOTE Only local controls are supported Table 3 H CCITT V 35 Digital Interface and Pin Assignments pin mnem signal name CCITT signal direction a b A...

Страница 32: ...This interface is typically used to interface with encryption devices on the BLACK side where the modems act as the network and supply clocking in a synchronous configuration or to interface to the R...

Страница 33: ...33 2270 Fiber Optic Modem Figure 3 3 Available Strapping Options for Programmable Buffered Interface...

Страница 34: ...ammable Buffered Interface 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 50 ns C C O C 60 ns O C O C 70 ns C O O C 80 ns O O O C 90 ns C C C O 100...

Страница 35: ...through 100 ohms to signal ground W1 position or isolates chassis ground from signal ground jumper out The W5 W6 and W7 jumpers when installed ground the midpoints of the 100 ohm termination resistan...

Страница 36: ...6 Canoga Perkins 3 8 1 Generic Interface This interface see Figure 3 5 conforms to the EIA RS 530 pinout and signal flow for a DCE device Figure 3 5 Programmable Buffered Interface Model P53 DCE RS 53...

Страница 37: ...this application the modems are acting as the network although the timing input is from an outside source The modem in which the timing source is connected should be set for external and the other mo...

Страница 38: ...dems are acting as the network timing source In most cases both modems should be set for internal master clock The rate switches should be set to the appropriate speed for the circuit This header is p...

Страница 39: ...is application the modems are acting as an extension of the Red side cable in a true tail circuit The modem at the Red end is set for external clock and the modem at the DTE end is set for slave clock...

Страница 40: ...erface and should be used when connecting to a DCE device This allows the use of a straight through RS 530 cable Figure 3 9 illustrates the DCE to DTE pin assignments The gender of this adapter on the...

Страница 41: ...ce and should be used if preexisting cabling was installed for use with Model P2 interface cards see Figure 3 10 This adapter converts the stan dard RS 530 pin assignment on the P53 back to the origin...

Страница 42: ...f physical connectors used for the inter face Table 3 L lists the six interface models with the corresponding source and termination im pedances and physical connectors Table 3 M shows the jumper opti...

Страница 43: ...jumper option may not exist on some older versions It is only required when performing Local loopbacks The W4 position corrects the duty cycle of External Clock above 9 Mbps 3 9 1 Model TW The signal...

Страница 44: ...mode NOTE The SCT output cannot be returned on the SCTE leads to eliminate propagation delay problems with this interface 3 9 3 Model T22 The signaling used on this interface is RS 422A Five TwinAx co...

Страница 45: ...45 2270 Fiber Optic Modem Figure 3 12 Five TwinAx Connectors BJ 77 Type Table 3 N Models D22 and D88 Connector Pin Assignments...

Страница 46: ...witch Figure 3 13 Inteface Card Installation 3 11 Standalone Reconfiguration To access the circuit board on a standalone unit the enclosure cover must first be removed by loosening the six screws on t...

Страница 47: ...set to use the external clock The optional clock may be selected via front panel switches at the time of installation Figure 4 1 2270 Circuit Board Diagram 4 2 Fiber Optics Since light is the transmis...

Страница 48: ...nanosecond pulses These pulses are realized on every clock edge and the pulse width is dependent on the actual data being trans mitted The time between these pulses is appropriate to the speed at whic...

Страница 49: ...eive clock duty cycle to be inverted relative to the input clock but the clock to data phasing will still be correct This is an artifact of the design method used to ensure the high BCI The 2270 s des...

Страница 50: ...of RTS with some delay between the time RTS turns on and CTS turns on Some interfaces may interlock CTS with the presence of receive optical carrier through the DCD signal 4 8 1 Flow Control The only...

Страница 51: ...supported on the following modular interfaces RS 423 RS 232C RS 422 P53 and V 35 The test modes can be activated by setting the Loop switch on the front panel or by turning on the Local Loopback or Re...

Страница 52: ...loopback as in Figure 5 4 Local modem s Loop On indicator ON Remote modem s Loop On indicator Blinking Step 3 Setting Loop switch on local modem to Rem causes both interfaces to loopback Local modem s...

Страница 53: ...ooped back to the far end remote user device unless a bidirectional Local Loopback method is selected refer to Table 5 A Loopback Options The loopback point is set at the electrical interface of the l...

Страница 54: ...sh set the switch back to OFF A Remote Loopback can also be activated through the electrical interface if it supports the Remote Loopback control lead refer to Section 3 Data Interfaces for pin number...

Страница 55: ...indicator will light When the far end modem detects the test pattern presence the Loop On indicator will light and the Rx Data indicator will blink This means that the test pattern was properly receiv...

Страница 56: ...the System Test Diagnostic Procedure 6 2 System Test Diagnostic Procedure Step Symptom Possible Cause s Action 1 No data transmission Defective fiber optic Set the System Loopback between modems modem...

Страница 57: ...nd small changes in the actual link loss 3 Cable loss exceeds Defective F O cable Repolish or replace modem loss budget defective connectors 4 Cable loss exceeds Defective F O connectors Repair or rep...

Страница 58: ...nly Reduces Peak Modulation Intensity by at least 3 dB Wavelength 850 nm LED Model 1310 nm Laser Models Fiber Optic Connectors ST or FC type Fiber Optic Receiver PIN diode Transmission Code Pulse Widt...

Страница 59: ...twinaxial connectors BJ 74 B1 female DA 15 B3 two male BNC connectors Power Requirement Standalone Standard 115 VAC 10 0 22 Amps max Optional 230 VAC 0 11 Amps optional max 47 to 63 Hz both Optional 4...

Страница 60: ...10 nm FC SINGLE MODE 11 1310 nm ST 13 1310 nm FC INTERFACE OPTIONS 22 RS 422 RTS LOW DC37 32 RS 232 DB25 35 V 35 MRC34 D22 HIGH SPEED 20Mb RS422 DC37 D88 MIL 188 114 DC37 H22 RS 422 RTS HI DC37 ECL PR...

Страница 61: ...818 718 6300 before you return a Canoga Perkins product for service or repair If the product s warranty has expired you will need to provide the Canoga Perkins Customer Service representative with a p...

Страница 62: ...Products Carefully inspect the cable upon receipt If the cable is defective contact the Canoga Perkins Customer Service Department within ten 10 working days of receipt to obtain a Return Material Aut...

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