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14

V.35 FOLD

5.3 Troubleshooting

Here are some problems to look for:

•

Incompatible Baud Rates

.

Remember that both V.35
FOLDs and their attached V.35
devices must all have the same
baud rate. Any incompatibility
will result in corrupt data
transmission.

•

Incorrect V.35 Connections

. Use

a BERT (Bit Error Rate Tester)
to verify that your V.35 devices
and the V.35 ports of the FOLDs
are functioning properly.

•

Lead Mismatching

. The TX

connector of the local FOLD
should be attached to the RX
connector of the remote FOLD.
Conversely, the RX connector 
of the local FOLD should be
attached to the TX connector 
of the remote FOLD.

•

Maximum Link Distance

. Check

the specifications to make sure
that the fiberoptic cable you are
running between the two FOLDs
has not exceeded the operating
range.

•

Damaged Fiberoptic Cable

. If

one direction of the link fails the
TST test, try reversing the leads
on 

both ends

of the link. Repeat

the TST test on both FOLDs. If
the other direction of the link
now fails the test, the problem 
is in the fiberoptic cable.

Summary of Contents for ME522A-SM

Page 1: ...nical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com FEBRUARY 1998 ME522A ST ME522AE ST ME522A SM ME522AE SM V 35 FOLD ST V 35 FOLD SM V 35 FOLD RTS CD TD RD PWR DLB TEST ...

Page 2: ... area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for Radio noise emission from ...

Page 3: ... CTS Delay 10 3 6 Full or Half Duplex Operation 11 3 7 Final Installation Procedures 11 4 Monitoring Operation 12 5 Diagnostics and Troubleshooting 13 5 1 Simple Problems 13 5 2 Diagnostic Tests 13 5 3 Troubleshooting 14 6 Fiberoptic Considerations 15 6 1 Link Distance 15 6 2 Handling Fiber Optic Cable 15 Appendix A V 35 Pin Assignments 16 Appendix B Tail Circuit Applications 17 Contents ...

Page 4: ...B km fiber optic cable Connectors 2 fiberoptic SMA 905 female or ST female 1 DB25S 25 pin sub D female pinned per EIA530A A DB25 to V 35 female M block adapter cable is included Fiber Optic Characteristics Wavelength 820nM Receiver Sensitivity 21 7dB Launch Power 10 1 dB into 100µ cable typical 14 1 dB into 62 5µ cable 19 6 dB into 50µ cable Operation Point to point Mode Full or half duplex synchr...

Page 5: ... Storage Temperature 4 to 158 F 20 to 70 C Humidity 15 to 90 relative humidity noncondensing Mean Time Between Failures approximately 100 000 hours Power Wallmount transformer 115 VAC 60 Hz 8VA or 230 VAC 50 Hz 8VA Size Standalone 1 8 H x 5 5 W x 8 5 D 4 6 cm x 14 0 cm x 21 6 cm Rackmount 4 7 W x 7 4 D 11 9 x 18 8 cm Weight Standalone 1 5 lb 0 7 kg Unit and transformer 2 2 lb 1 0 kg Rackmount 0 5 ...

Page 6: ...y on the V 35 interface only CD indicates that there is a carrier signal on the RX fiberoptic connector Two pushbuttons on the front panel TST and DLB make diagnostics easy to use Internal switches or jumpers determine these characteristics Speed Carrier constant or switched with selectable RTS CTS delay Operation full or half duplex TX data clock select Your FOLD package should include the base u...

Page 7: ...by might be quite warm This is normal because of power dissipated in V 35 transmission Important Both V 35 devices and both V 35 FOLDs must be set to the same speed 3 Installation and Configuration Table 1 DIP Bank Speed Settings Bank Switch Speed in Kbps 2 4 4 8 9 6 19 2 38 4 56 64 112 128 256 4 1 On On On On Off Off Off Off Off Off 4 2 Off On On Off Off Off Off Off Off Off 4 3 Off On Off Off Off...

Page 8: ...8 V 35 FOLD P1 S3 S4 S5 W3 W2 A B C D E OPEN 1 2 3 4 HALF FULL OPEN 1 2 3 4 O F F 1 2 3 4 5 6 7 8 Figure 2 Circuit Board Layout for the V 35 FOLD ...

Page 9: ...A and TCB MASTER CLOCK To create a master clock one of the FOLDs should be set to internal or external clocking and the other FOLD set to recovered clock 3 4 Carrier Constant Switched Jumper W2 is used to select Constant Carrier or Switched Mode See Figure 2 for the jumper s location on the printed circuit board This option determines how the FOLD reacts to an RTS signal from the local V 35 device...

Page 10: ...s CD indicator will also light indicating that a transmission link has been established Once the local V 35 device drops RTS the local RTS and remote CD indicators will go out 3 5 RTS CTS Delay In Switched mode you may insert a delay after the V 35 device raises RTS This will delay the return of CTS from the FOLD to the V 35 device This feature is useful in applications that require time for the r...

Page 11: ...ures Replace the top cover Replace the screw Connect your fiberoptic cable to the V 35 FOLD When using SMA connectors tighten the connection with your fingers and then stop Do not over tighten Connect the DB25 to female M block connector to the V 35 FOLD Connect the other end to your V 35 device Plug the power supply into an AC outlet The V 35 FOLD is now ready for operation Figure 3 The rear pane...

Page 12: ...smission In Constant Carrier mode the RTS LED will always be on In Switched mode the RTS LED will be on only if RTS is asserted CD Indicates the presence of carrier signal at the RX fiberoptic connector If the remote V 35 FOLD is in Constant Carrier Mode the local V 35 FOLD s CD LED will always be on If the remote V 35 FOLD is in Switched Mode the local V 35 FOLD s CD LED will light when the remot...

Page 13: ...remote V 35 FOLD is correctly receiving and decoding the null data If you press the TST button on both the local and remote FOLDs both RD indicators should go off This ensures that both directions of the link are in working order The RD indicator may flash before switching off entirely This is normal If the RD indicator remains lit or flickers see Section 5 3 Troubleshooting DLB Press the DLB push...

Page 14: ...hing The TX connector of the local FOLD should be attached to the RX connector of the remote FOLD Conversely the RX connector of the local FOLD should be attached to the TX connector of the remote FOLD Maximum Link Distance Check the specifications to make sure that the fiberoptic cable you are running between the two FOLDs has not exceeded the operating range Damaged Fiberoptic Cable If one direc...

Page 15: ...he quality of the fiber itself connectors and the terminus connections 6 2 Handling Fiber Optic Cable Treat connectors the same as a fine camera lens Clean the connectors with lens cleaning tissue before installing them Keep connectors covered with not installed Never use the connectors to pull fiberoptic cable through conduits Do not pull fiberoptic cable tightly around a corner This can cut tran...

Page 16: ...t TCA 15 Y TCB 12 AA Received data Out RDA 3 R RDB 16 T Remote TX clock In ETCA 24 U ETCB 11 W Signal Detect Out DCD 8 F Request to Send In RTS 4 C Clear to Send Out CTS 5 D Signal Ground In Out SG 7 or 23 B Protective Ground In Out FG 1 A Data Set Ready Out DSR 6 E RX Data Clock Out RCA 17 V RCB 9 X RX data clock Out RCA 17 V RCB 9 X ...

Page 17: ... external clock inputs and omits the Transmit clock lines TCA and TCB With TCA and TCB omitted there is no danger of creating a short circuit on those leads and in turn increasing the current that the unit will draw Host CPU Fiberoptic Cable CSU DSU V 35 FOLD V 35 FOLD V 35 Cable EYN450 V 35 Tail Circuit Cable EYN452 CSU DSU Front End Processor DDS Line A A B B C C F F E E H H R R P P T T S S U V ...

Page 18: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1998 Black Box Corporation All rights reserved ...

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