Black Box ME759C-RJ11, May-95 Appendix Cable Recommendations, Wire Gauge Capacitance Resistance

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APPENDIX: Cable Recommendations

Appendix: Cable Recommendations

The Multi-Function LD Card has been performance-tested using twisted-pair cable with these characteristics:

Wire Gauge

Capacitance

Resistance

19 AWG

83 nf/mi. or 15.72 pf/ft.*

16.3

Ω/1000 ft. (53.5 Ω/km)

22 AWG

83 nf/mi. or 15.72 pf/ft.*

32.6

Ω/1000 ft. (107 Ω/km)

24 AWG

83 nf/mi. or 15.72 pf/ft.*

51.65 Ω/1000 ft. (169.5 Ω/km)

26 AWG

83 nf/mi. or 15.72 pf/ft.*

82.35 Ω/1000 ft. (270.2 Ω/km)

*Alternatively, 51.6 nf/km or 51.6 pf/m

If you use the Multi-Function LD Card with a different type of twisted-pair cable, make sure that the cable has characteristics similar to, or better than, those listed above (for example, lower capacitance or lower resistance).

Bench tests yield the following data-rate/maximum-distance results:

Data Rate

 

Maximum Distance in miles (km)

 

in bps

19 AWG

22 AWG

24 AWG

26 AWG

57,600

12 (19.3)

7 (11.3)

5.3

(8.5)

4 (6.4)

38,400

13 (20.9)

7.5 (12.1)

6.2 (10)

4.2 (6.8)

28,800

14 (22.5)

8 (12.9)

6.6 (10.6)

4.6 (7.4)

19,200

16 (25.7)

8.5 (13.7)

7 (11.3)

5.1 (8.2)

14,400

17 (27.4)

11 (17.7)

9.2 (14.8)

6.5 (10.5)

9600

18.5 (29.8)

13 (20.9)

10.4

(16.7)

7.5 (12.1)

7200

19 (30.6)

13.5 (21.7)

10.9

(17.5)

8 (12.9)

4800

19.5 (31.4)

14 (22.5)

11.3

(18.2)

8.8 (14.2)

3600

20 (32.2)

14.5 (23.3)

11.5

(18.5)

8.8 (14.2)

2400

20.5 (33)

15 (24.1)

11.6

(18.7)

9 (14.5)

1800

20.5 (33)

15 (24.1)

11.5

(18.5)

8.9 (14.3)

1200

20 (32.2)

15 (24.1)

11.4

(18.3)

8.9 (14.3)

Many environmental factors can affect the maximum distances obtainable at a particular site. Use this table as a general guideline only.

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Contents Multi-Function LD Cards FCC Statements MULTI-FUNCTION LD Card NOM Statements Contents Specifications Connectors IndicatorsDiagnostics Weight PowerTemperature FuseOverview FeaturesIntroduction Introduction Setting the Switches on the Main Module Main-module switchesOn and OFF settings of the DIP switches Switch S1 SummaryS1 Position 7 Protocol S1 Positions 1 through 4 Data-Rate SettingS1 Positions 5 and 6 Clock Source S1 Position 8 Carrier-Control Method Switch S2 SummaryS2 Position 2 2-Wire vs -Wire Operation S2-6 Signaling-Rate Range S2 Position 3 V.52 and V.54 Diagnostic TestingS2 Positions 4 and 5 RTS/CTS Delay S2-7 and S2-8 Word LengthSwitch S3 Summary S3-1 and S3-2 Input ImpedanceS3-5 DTE RS-232 Initiation of Local Loopback Test Recommended Impedance SettingsS3-4 Mode Selection S3-6 DTE RS-232 Initiation of Remote Loopback TestSetting the Jumpers on the Interface Module S3-7 and S3-8 Antistream ControlFour interface modules Jumper locations Summary of Interface-Module Jumper Functions Line Interface Line Shield Connection to Frame Ground JB2Serial Interface Signal Ground and Frame Ground JB4 JB5Installation MicroRacks An OverviewMicroRacks’ Power Supply Installing the Multi-Function LD Card in the MicroRack Pinout of the 10-Pin RJ Interface RS-232 Serial Cables and ConnectorsPinout of the RS-232 Interface Modem-to-Modem Line Cables and Connectors Line-Cable Pinouts AT&T standard modular color codesTwo-pair star wiring for host and slave Cards Multipoint ApplicationsOperation and Diagnostics Status LEDsRTS and CD Indicators Diagnostic Testing Using the Error LED Power-Up V.54 and V.52 Diagnostic Tests Remote Digital Loopback RDL Using the V.52 Bert Test Independently Shipping and Packaging TroubleshootingCalling Your Supplier Wire Gauge Capacitance Resistance Appendix Cable RecommendationsMULTI-FUNCTION LD Card Copyright 1995. Black Box Corporation. All rights reserved
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