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Canoga Perkins 2270 User Manual

Manual is about: Fiber Optic Modem

Summary of 2270

  • Page 1

    M o d e m s canoga perkins 2270 fiber optic modem user manual.

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    2 canoga perkins notice! Canoga perkins has prepared this manual for use by customers and canoga perkins personnel as a guide for the proper installation, operation and/or maintenance of canoga perkins equipment. The drawings, specifications and information contained in this document are the propert...

  • Page 3

    3 2270 fiber optic modem 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 ...

  • Page 4: Table of Contents

    4 canoga perkins table of contents chapter 1 - general ..........................................................................................8 1.1 equipment description ................................................................................... 8 1.2 functions, leds and switches ...........

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    5 2270 fiber optic modem 3.5.2 ds1 / t1 model -t1 ......................................................................................... 30 3.6 ttl/bnc interface model -bn .................................................................. 30 3.8 ....................Programmable buffered interface...

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    6 canoga perkins list of figures figure page 1-1 front panel mode/rate switch ...........................................................................................9 1-2 locations of various switches .........................................................................................13 2-1...

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    7 2270 fiber optic modem list of tables table page 1-a available modem controls ............................................................................................................. 8 1-b guaranteed loss budgets ...................................................................................

  • Page 8: Chapter 1 - General

    8 canoga perkins chapter 1 - general 1.1 equipment description the 2270 is a high-speed modem for full-duplex operation over fiber optic cable. It operates syn- chronously up to 20 mbps, and asynchronously up to 5 mbps in the sample-data mode with a 25% jitter limit. The 2270 is available in rack-mo...

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    9 2270 fiber optic modem figure 1-1. Front panel mode/rate switch the rate setting determines what rate the modem will operate at if set to the internal clocking mode or the rate used when a modem set to the slave clocking mode is set for local loopback. The modes are: external clock internal clock ...

  • Page 10: 1.3  2201 Rack Chassis

    10 canoga perkins 1.3 2201 rack chassis the 2201 rack chassis is designed to accommodate up to ten 2200 series modems. It offers a variety of features, including local audible/visible and remote power failure alarms, op- tional redundant power supply, and the ability to allow modem removal from the ...

  • Page 11: 1.7  Loss Budget

    11 2270 fiber optic modem 1.7 loss budget the maximum possible distances with either standard or long distance versions is dependent on the overall power loss over the fiber optic link. This is called the link loss. The launch power for the modem is compared with receiver sensitivity. The determinat...

  • Page 12: Version Only)

    12 canoga perkins • are you using the correct clock mode (internal/external) for synchronous trans- mission? • have the modem’s mode and rate switches been set properly? (the 2270 is set to the external clock mode at the factory.) • if you have problems after carefully checking these items, turn to ...

  • Page 13

    13 2270 fiber optic modem these settings give minimum and maximum losses for each of the four possible switch combina- tions. There is overlap between these ranges that is guaranteed to meet or exceed ± 1.0 db from the transition points. The performance of every modem is guaranteed to fit the parame...

  • Page 14

    14 canoga perkins table 1-c. 2270 switch functions loop test switch on front panel (described in section 5, “troubleshooting”). Loc position will activate a local interface loopback. Rem position will activate a system test and control the state of the far-end loopback. Off position is for normal tr...

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    15 2270 fiber optic modem table 1-d. 2270 jumper functions signal ground controls connecting circuit ground to the chassis. Chassis connects them together. Float isolates the two grounds. Factory setting = float sct polarity controls the transmit clock output. Norm is always used for low data rates ...

  • Page 16: Chapter 2 -  Installation

    16 canoga perkins chapter 2 - installation 2.1 unpacking the unit each 2200 series modem is shipped factory tested, and packed in a protective carton. Unpack the unit and retain the shipping carton and protective packing for reuse in the event it is necessary to return the modem to the factory. To a...

  • Page 17: 2.5  Dc Power

    17 2270 fiber optic modem repeat this procedure for the second modem using the center cover retaining screw on the right side of the modem. After the modems are secure, you can mount the shelf into the equipment rack. Note: depending on accessibility, it may be necessary to connect the fiber cables ...

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    18 canoga perkins the outside case of the dc-powered modems will run warmer to the touch than the corresponding ac-powered units. This is because the cover is used as a heat sink for the dc/dc converter. 2.6 rack chassis installation the 2201 rack chassis is designed to accommodate up to ten 2270 mo...

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    19 2270 fiber optic modem figure 2-2. 2201 rack chassis front view with modems installed table 2-a. Operating mode selections internal dip switches sct polarity (c) closed (o) open jumper 4 5 6 operating mode norm c o o external clock mode (sct suppressed) norm o c x slave clock mode (sct=receive cl...

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    20 canoga perkins 2.7.3 asynchronous operation the 2270 can operate in the data-only asynchronous mode by setting the clock mode to inter- nal and the clock rate to the highest frequency setting (switch positions 1-3 all closed). This allows for a maximum asynchronous rate of one-quarter of the inte...

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    21 2270 fiber optic modem when the modem is the source of the transmit clock, there is a finite time delay before that clock arrives at the dte to clock its transmitter. There is another time delay before the data from the dte arrives back at the modem. Since the modem uses its own clock signal to a...

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    22 canoga perkins to accomplish this, the sct pol jumper needs to be changed. The position set at the factory is norm, which assumes a negligible delay in the cable and dte user device. The inv position can improve performance if that delay is an odd-multiple of one-half a clock period. Using an osc...

  • Page 23: 3.3  Rs-449/422 Interfaces

    23 2270 fiber optic modem chapter 3 - data interfaces 3.1 electrical data interfaces a variety of interfaces are available with the 2270 modem. Each is designed to conform with existing standards. Refer to section 7, “specifications,” for applicable configurations, standards and physical connector t...

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    24 canoga perkins rs-232c rs-423/ccitt pin mnem signal name mnem signal direction 1 fg frame ground fg 101 n.A. 2 txd transmit data sd 103 to modem 3 rxd receive data rd 104 from modem 4 rts 1 request to send rs 105 to modem 5 cts 1 clear to send cs 106 from modem 6 dsr data set ready dm 107 from mo...

  • Page 25: 3.3.1  Model -22

    25 2270 fiber optic modem table 3-c. Rs-499 (rs-422) signals and pin assignments pin eia signal name ccitt signal direction 1 fg frame ground 101 frame ground 19 sg signal ground 102 signal ground 4/22 sd send data 103 to modem 5/23 st/sct send timing 114 from modem 6/24 rd receive data 104 from mod...

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    26 canoga perkins 3.4 rs-530 interface model -r30 the eia rs-530 interface uses rs-422 (balanced) electrical signals for all interface circuits (data, clock and control), except for the loopback (local/remote), and test mode pins which use rs-423 (unbalanced bipolar) electrical signals. The db-25 pi...

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    27 2270 fiber optic modem table 3-e. Rs-530 jumper options jumper options chassis gnd jumper (*) 100 ohm position: connects chassis ground to signal ground through 100 ohm resistor. Short position: connects chassis ground directly to signal ground. Factory setting = 100 ohm rly jumper nc position: c...

  • Page 28: 3.5  T1/e1 Interfaces

    28 canoga perkins 3.5 t1/e1 interfaces there are only two versions of t1/e1 interfaces available. The transparent bipolar models -b1, b2 and b3 are compatible with any bipolar line coded t1/e1 data and the ds1/t1 model -t1 is for t1 only. 3.5.1 transparent bipolar models -b1, -b2, -b3 this interface...

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    29 2270 fiber optic modem table 3-g. Line build out settings switch positions for 4bx 1 2 3 4 5 mode of e1 t1 len0 len2 len1 operation e1 on off on on on e1 ccitt off on off on off 0-133 ft dsx-1 off on on off on 133-266 ft abam off on off off on 266-399 ft & pic off on on off off 399-533 ft off on ...

  • Page 30

    30 canoga perkins 3.5.2 ds1 / t1 model -t1 this interface is compatible with ami-coded t1 data only. If line coding is other than ami, such as b8zs, then a model b type interface must be used. Note: this interface corrects bipolar viola- tions. If these violations must pass through for fault detecti...

  • Page 31

    31 2270 fiber optic modem 3.7 ccitt v.35 interface model -35 this interface is compatible with ccitt recommendation v.35 appendix ii (electrical characteris- tics for balanced double-current interchange circuits). The rts control input is biased to the off state. If a connection is not made to this ...

  • Page 32

    32 canoga perkins 3.8 programmable buffered interface – model p53 the model p53 interface module employs an rs-422 electrical interface with a db-25 interface connector (rs-530). It also employs an 8-bit elastic buffer. A combination of fifo (first in, first out), delay line and inverter circuitry a...

  • Page 33

    33 2270 fiber optic modem figure 3-3. Available strapping options for programmable buffered interface.

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    34 canoga perkins figure 3-4. Board layout for programmable buffered interface table 3-i. Delay times for programmable 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 n...

  • Page 35

    35 2270 fiber optic modem this interface has strap option jumpers to configure the rlsd output at j1-8/10 (db-25) to sup- port the kg-194 resync functionality. Jumper straps w10/w11 (adjacent to u11) and w12/w13/ w14 (adjacent to u8) implement this function (refer to table 3-j). Jumper straps w10/w1...

  • Page 36

    36 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-530

  • Page 37

    37 2270 fiber optic modem 3.8.2 external station the external station is used when an external station clock is providing timing (see figure 3-6). When connecting kg or kiv encryptors together on the black side, using an external timing device you should install the external station clock strapped h...

  • Page 38

    38 canoga perkins 3.8.3 internal the internal function is used when network equipment is set for eternal timing (see figure 3-7). When connecting kg or kiv encryptors together on the black side, you should install the internal strapped header in the j3 position. In this application, the modems are a...

  • Page 39

    39 2270 fiber optic modem 3.8.4 external the external function is used when network equipment is set for network or internal timing (see figure 3-8). 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. In this appl...

  • Page 40

    40 canoga perkins 3.8.5 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 3-9 illustrates the dce to dte pin assignments. The gender of this adapter on the user side is male. ...

  • Page 41

    41 2270 fiber optic modem 3.8.6 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 3-10). This adapter converts the stan- dard rs-530 pin assignment on the p53 back to the original p...

  • Page 42

    42 canoga perkins 3.9 high-speed rs-422/mil-std 188-114c interfaces there are three high-speed rs-422 interface models (-tw, -t22 and -d22) and three high-speed mil-std 188-114c interface models (-tw8, -t88 and -d88) available. All can operate up to 20 mbps. All support only clock and data signals a...

  • Page 43

    43 2270 fiber optic modem table 3-m. Jumper strap options jumper description factory configuration id tw tw8 t22 t88 d22 d88 w1/w2 defines whether alarm relay w2 w2 n/a n/a n/a n/a contact is normally open (w2) or normally closed (w1) w3/w4* w3=vco disabled w4 w4 w4 w4 w4 w4 w4=vco enabled w5/w6 w6=...

  • Page 44

    44 canoga perkins 3.9.2 model -tw8 the signaling used on this interface is mil-std 188-114c. Four twinax connectors (bj-77 type) are used for the physical connection (see figure 3-11). A switch is provided to select whether the fourth twinax (sct/scte) is to be used as an output (sct) or as an input...

  • Page 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.

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    46 canoga perkins 3.10 interface reconfiguration figure 3-13 shows 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 a...

  • Page 47: 4.1  Modem Operation

    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-...

  • Page 48: 4.3  Transmit Section

    48 canoga perkins figure 4-2. Typical high speed 2270 modem application 4.3 transmit section the data and clock signals input to the interface are converted to 5v logic signals for use by the modem circuit. These signals then pass through the loopback and test pattern selectors to be processed by th...

  • Page 49: 4.6  Bit Count Integrity

    49 2270 fiber optic modem 4.6 bit count integrity the 2270’s design enables a much better integrity for the clock than the data. The data bit error rate (ber) can be summarized as, “no more than one bit error in 10 11 bits.” the bit count integrity (bci) can be summarized as, “no more than one count...

  • Page 50

    50 canoga perkins if data carrier detect (dcd) is present as an interface output, it is asserted if the remote modem is sending valid optical carrier to the local modem. If the interface is looped back for testing, dcd is asserted — regardless of the state of optical carrier. However, when flow cont...

  • Page 51: 5.1  Diagnostic Procedures

    51 2270 fiber optic modem chapter 5 - troubleshooting 5.1 diagnostic procedures the following procedures are intended for use in the event of a system failure, not during the initial installation of a 2270 optical link. For initial installation checkout, refer to chapters 1 and 2. 5.2 system test al...

  • Page 52

    52 canoga perkins jumpers local modem remote modem alt b alt a normal mode *1 alternate mode *2 normal mode *1 alternate mode *2 off off bi-directional *3 interface only *4 optical only *5 bi-directional *6 off on interface only *4 bi-directional *3 optical only *5 bi-directional *6 on off bi-direct...

  • Page 53

    53 2270 fiber optic modem 5.2.1 local loopback test 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. No data is looped back to the far-end (remote) user device unless a bidirection...

  • Page 54

    54 canoga perkins 5.2.2 remote loopback test to activate the remote loopback test, set the loop switch to rem and, after the rx data indicator begins to flash, set the switch back to off. For the “system test only” option, retain the test switch in the rem position (refer to section 5.2.3). The loca...

  • Page 55

    55 2270 fiber optic modem 5.2.3 system loopback test this section describes the “system test” remote loopback test feature in detail. See figure 5-1 for an illustration of system test. The system test provides a simple way to verify most of the components in a 2270 link without any special test equi...

  • Page 56

    56 canoga perkins chapter 6 - diagnostic procedures 6.1 2270/2201 diagnostic procedures the following diagnostic procedures should be followed to test the 2270 system, troubleshoot a defective link or detect a defective fiber optic cable, connector, modem or power supply. Note: refer to the 2201 rac...

  • Page 57

    57 2270 fiber optic modem step symptom possible cause(s) action 2 (cont.) perform the following optical loss calculation: • local receiver level minus remote transmit level = near-end link loss figure • remote receive level minus local transmit level = far-end link loss figure check the optical cabl...

  • Page 58: Chapter 7 - Specifications

    58 canoga perkins chapter 7 - specifications 7.1 diagnostic indicators and controls system test, optical power, rx/tx, power on, power alarms (2201) 7.2 optical interface composite error rate 1 in 10 10 or better fiber optic cable compatibility 50 to 62.5 micron multimode or 8 to 10 micron single mo...

  • Page 59: 7.3  System Electrical

    59 2270 fiber optic modem 7.3 system electrical interfaces supported rs-232c/rs-423, rs-422, v.35, ds1/t1, ttl/bnc, programmable buffered rs-530, mil std-188-114c, rs-530, transparent t1/e1 duty cycle for clock input 50% ± 20% 6.5 mbps to 20 mbps 50% ± 25% less than 6.5 mbps interface type interface...

  • Page 60

    60 canoga perkins operating environment temperature 0 to 50 ° c humidity 0 to 95% (non-condensing) mtbf 62,500 hours (calculated) 7.5 2270 fiber optic modem configurations 2270-s-xxx-xx-xx-x s = standalone 2270-r-xxx-xx-xx-0 r = rack-mount * power options 0- n/a 1- 115 vac 2- 115/230 vac in-line 3- ...

  • Page 61: Warranty

    61 2270 fiber optic modem a.1 customer service department repair warranty repairs performed by the canoga perkins customer service department are warranted to be free from defects in material and workmanship for a period of 90 days from the date of ship- ment of the repaired product, or until the ex...

  • Page 62: A.4 Warranty

    62 canoga perkins a.4 warranty electronic products canoga perkins warrants to the customer that all goods sold to the buyer will perform in accordance with the applicable data sheets, drawings or written specifications, and at the time of sale will be free of defects in material and workmanship. The...