Black Box ME760A-R2 User Manual Download Page 44

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CHAPTER 6: Troubleshooting

Figure 6-2. A remote LDM-MR19.2 in digital loopback.

Figure 6-3. A local LDM-MR19.2 in digital loopback.

RCVR

DATA

CLK

DIG

PRESSED

LOCAL

DATA

TERMINAL

RCVR

XMTR

DATA

CLK

REMOTE

DATA

TERMINAL

XMTR

LOCAL

DATA

TERMINAL

XMTR

RCVR

DATA

CLK

DATA

RLB

PRESSED

REMOTE

DATA

TERMINAL

RCVR

XMTR

Summary of Contents for ME760A-R2

Page 1: ...7 BBOX FREE technical 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 mai...

Page 2: ...is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever m...

Page 3: ...bo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El parato el ctrico debe ser montado a l...

Page 4: ...contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser l...

Page 5: ...RADEMARK USED IN THIS MANUAL AS 400 is a registered trademark of International Business Machines Corporation Any other trademarks mentioned in this manual are acknowlegded to be the property of the tr...

Page 6: ...21 4 Card Installation 26 4 1 The RackNest 2 14 26 4 2 The RackNest 2 14 s Power Supply 27 4 3 The RackNest 2 14 Illustrated 28 4 4 Card Configuration Procedure 31 4 5 Card Installation Procedure 35 5...

Page 7: ...ither internal external from local DTE or recovered from remote LDM MR19 2 Data Format 5 6 7 or 8 data bits 1 1 5 or 2 stop bits even odd or no parity but see Table 3 3 on page 26 Operation 2 or 4 wir...

Page 8: ...14 Jumpers Transmit timing 2 or 4 wire operation CTS delay Carrier control Transmit level Transmit line impedance Receive line impedance Enable disable analog loopback command on Pin 18 Enable disable...

Page 9: ...E760A 115 VAC 47 to 63 Hz 3 watts input cord terminated with N American standard NEMA 5 15P plug ME760AE 230 VAC 47 to 63 Hz 3 watts input cord unterminated when shipped terminated by user Protection...

Page 10: ...km 5 mi 8 1 km 3 4 mi 5 4 km 9 600 9 8 mi 15 8 km 6 5 mi 10 5 km 4 4 mi 7 km 7 200 10 5 mi 17 3 km 7 mi 11 5 km 4 7 mi 7 7 km 4 800 13 5 mi 21 8 km 9 mi 14 5 km 6 mi 9 7 km 3 600 15 mi 24 km 10 mi 16...

Page 11: ...AC or DC overvoltages The protection circuitry allows operation even when DC is connected to the line because of the following features Transmit Level and Transmit and Receive Impedances are independe...

Page 12: ...in one of five modes 4 wire full duplex 4 wire half duplex 2 wire half duplex 4 wire multipoint 2 wire multipoint 2 1 2 MODULATION TIMING The modulation timing circuit supplies the Transmit clock to...

Page 13: ...remote converter adds a shorter stop bit before sending the data to the remote DTE For frequency deviations of up to 1 1 the stop bits should be shortened every eight characters 12 5 For frequency de...

Page 14: ...automatic gain control automatically compensates for the attenuation of the line You can choose between the two modes of AGC operations by setting the AGC jumper ON The AGC operates continuously CNTR...

Page 15: ...s when the data rate is greater than or equal to 4 8 Kbps Table 2 1 below contains general guidelines for choosing AGC and CTS delay settings Each application is unique however you might find that you...

Page 16: ...nd to a DDS network set the V 54 DELAY jumpers of the modems located close to the DDS network to ON to prevent multiple loopbacks The DELAY switch prevents the last modem from receiving the complete V...

Page 17: ...2 LDM MR19 2 LDM MR19 2 LDM MR19 2 SLAVE 1 XMT IMP 150 RCV IMP HIGH SLAVE 2 XMT IMP 150 RCV IMP HIGH SLAVE 3 XMT IMP 150 RCV IMP HIGH SLAVE N XMT IMP 150 RCV IMP 150 A S 400 LDM MR19 2 LDM MR19 2 PC...

Page 18: ...LDM MR19 2 EXT CLOCK V 54 DLY ON LDM MR19 2 RCV CLOCK V 54 DLY OFF MASTER LDM MR19 2 SLAVE LDM MR19 2 SLAVE LDM MR19 2 SLAVE LDM MR19 2 CSU DSU CSU DSU PC running 5250 emulation software The XMT and R...

Page 19: ...ur unit is a 230 VAC ME760AE R2 model 3 2 Physical Placement Place the LDM MR19 2 on a tabletop or bench within 5 feet 1 5 m of a grounded 3 wire AC outlet and within 50 feet 15 2 m of the associated...

Page 20: ...ist CCITT EIA DTE SIGNAL V 24 RS 232 C PIN NAME DESCRIPTION 101 AA 1 Protective Chassis ground Can be isolated from Ground Signal Ground refer to GND Strap in Table 3 2 102 AB 7 Signal Ground Common s...

Page 21: ...erns the Transmitted Data Timing signal See the Note below 115 DD 17 Receiver Signal Synchronous data rate clock output sent to Element Timing the local DTE Governs the Received Data signal See the No...

Page 22: ...ns in Figure 3 2 on page 27 CAUTION Be sure the LDM MR19 2 is unplugged before you open it To set internal jumpers and switches follow the steps below 1 Loosen the screw holding the top cover in place...

Page 23: ...AY 8 ms 8 ms 64 ms No 5 Determines the transmit carrier mode ON ON CARRIER ON Transmit carrier is constantly ON CTRL CTRL Transmit carrier is ON only when RTS is high CTRL should be used in multipoint...

Page 24: ...t last level of amplification if DCD goes OFF No 14 ON Activates V 54 delay preventing ON V 54 DLY multiple loopback of tail end circuits OFF OFF OFF No delay No 15 S3 and S4 determine character lengt...

Page 25: ...ting Start Bit Data Bits Parity Stop Bit s Total Bits Always 1 5 NONE 2 8 ODD OR EVEN 1 or 1 5 8 2 9 6 NONE 1 or 1 5 8 2 9 ODD OR EVEN 1 or 1 5 9 2 10 7 NONE 1 or 1 5 9 2 10 ODD OR EVEN 1 or 1 5 10 2...

Page 26: ...25 CHAPTER 3 Standalone Installation Figure 3 2 The standalone LDM MR19 2 s board layout...

Page 27: ...d use its connectors instead 4 1 The RackNest 2 14 The RackNest 2 14 is a special 19 rack component designed to host a number of our short haul modems and line drivers As shown in Figures 4 1 on page...

Page 28: ...ssible AC outlet If your Nest is an RM110A you can use the power cord supplied with it if your Nest is an RM110AE use a power cord appropriate for your site s mains outlets The Nest begins operating a...

Page 29: ...DM MR19 2 card in the RackNest 2 14 as shown in Figure 4 1 below The front and rear panels of the Nest are shown in Figure 4 2 on the next page the numbered connectors controls and indicators are desc...

Page 30: ...29 CHAPTER 4 Card Installation Figure 4 2 The RackNest 2 14 illustrated GND RCV XMIT ON 1 7 2 5 3 4 6...

Page 31: ...le Provides power to modules installed in the enclosure 3 ON Indicator Lights when power supply is operating 4 Chassis Ground Terminal Connector for attaching other grounds devices etc to the Nest s c...

Page 32: ...n Figure 4 1 on page 36 When you have everything at least tentatively decided identify the control s on the Card whose settings you want to change refer to Figure 4 1 then move the control s to your d...

Page 33: ...8 ms 8 ms 64 ms No 5 Determines the transmit carrier mode ON ON CARRIER ON Transmit carrier is constantly ON CTRL CTRL Transmit carrier is ON only when RTS is high CTRL should be used in multipoint ap...

Page 34: ...DIS CONN DIS Isolates grounds from each other No 13 ON AGC always ON ON ON AGC CTRL AGC ON if DCD is ON remains CTRL at last level of amplification if DCD goes OFF No 14 ON Activates V 54 delay preven...

Page 35: ...34 LDM MR19 2 Figure 4 3 The LDM MR19 2 card s board layout...

Page 36: ...to the corresponding DB25 connector J1 on the back of the Nest For detailed information on the pinout of the DB25 connector see Table 3 1 on pages 21 and 22 5 If you haven t already done so install t...

Page 37: ...empt to operate it 5 1 Controls and Indicators All of the LDM MR19 2 s external controls and LED indicators are located on the unit s front panel as shown in Figure 5 1 below standalone or Figure 5 2...

Page 38: ...37 CHAPTER 5 Operation Figure 5 2 The LDM MR19 2 card s front panel 1 2 3 4 5 7 A 6 B C D...

Page 39: ...pback can also be activated from the terminal when the Pin 21 strap strap 10 is set to RLB EN see Section 3 4 D RPF ME760C only Turn OFF the RPF LED and reset the RPF circuitry see Section 5 4 Table 5...

Page 40: ...ocedure The LDM MR19 2 can operate entirely unattended However you should check the unit s LED indicators once in a while to make sure that everything is OK While the unit is ON operating personnel ar...

Page 41: ...can take down the whole LDM MR19 2 network without pinpointing where the failure has occurred 5 5 Turning the Unit OFF To turn OFF the LDM MR19 2 unplug its AC power cord standalone units or turn OFF...

Page 42: ...m the test separately at the local and remote sites 1 Press the ANA Analog Loopback pushbutton on the front panel of the unit you want to test The TEST LED should light The LDM MR19 2 s transmit outpu...

Page 43: ...REM button causes a loopback at the remote LDM MR19 2 2 Perform a terminal test or BERT see Section 6 1 1 3 If Step 2 indicates a fault and if the modem test described in Section 6 1 1 was successful...

Page 44: ...9 2 in digital loopback Figure 6 3 A local LDM MR19 2 in digital loopback RCVR DATA CLK DIG PRESSED LOCAL DATA TERMINAL RCVR XMTR DATA CLK REMOTE DATA TERMINAL XMTR LOCAL DATA TERMINAL XMTR RCVR DATA...

Page 45: ...cluding the nature and duration of the problem when the problem occurs the components involved in the problem any particular application that when used appears to create the problem or make it worse t...

Page 46: ...NOTES...

Page 47: ...NOTES...

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