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Chapter 3. Test Modes

61200062L1-1

DSU 56/64 User Manual

3-9

REMOTE TESTS

The DSU 56/64 responds to three remotely activated tests.

•

Remote Digital Loopback (RDL)

•

CSU Loopback (LL)

•

DSU Loopback (RT)

The

RDL

test is initiated by a remote DSU and causes the local DSU

56/64 to loopback. The loopback point is the same as the loop only
point. See Figure 3-4 on page 3-6. This test is run to test the end-to-
end performance of the circuit.

Both the

CSU L

OOPBACK

and the

DSU L

OOPBACK

tests are

activated from the telephone company diagnostic test equipment
and are used to isolate trouble on a circuit.

The

CSU L

OOPBACK

, commonly called the

test, has the same

loopback points as the

DTE

AND

OOP

test. It is used by the

telephone company to test the integrity of the local loop.

The

DSU L

OOPBACK

, commonly called the

test, has the same

loopback point as the

OOP

NLY

test and is used by the telephone

company to test the operation of both the local loop and DTE
interface sections.

Содержание DSU 56/64

Страница 1: ...DSU 56 64 Data Service Unit User Manual Part Number 1200062L1 61200062L1 1E May 2001...

Страница 3: ...less type during an electrical storm There is a remote risk of shock from lightning 3 Do not use the telephone to report a gas leak in the vicinity of the leak 4 Use only the power cord power supply a...

Страница 4: ...transmitted on the network The affidavit shall affirm that either no encoded analog content or billing informa tion is being transmitted or that the output of the device meets Part 68 encoded analog c...

Страница 5: ...ion information continuously complies with Part 68 of the FCC rules and Regulations The digital CPE does not transmit digital signals containing encoded analog con tent or billing information which is...

Страница 6: ...___________ telco s name with proper documentation to demonstrate compliance with the information in the preceding paragraph if so requested _____________________ Signature _____________________ Title...

Страница 7: ...ification is given otherwise notification is given as soon as possible The telephone company will advise the customer of the right to file a complaint with the FCC 5 The telephone company may make cha...

Страница 8: ...n which case the user will be required to correct the interference at his own expense Shielded cables must be used with this unit to ensure compliance with Class A FCC limits Canadian Emissions Requir...

Страница 9: ...ns Repairs to certified equipment should be made by an authorized Canadian mainte nance facility designated by the supplier Any repairs or alterations made by the user to this equipment or equipment m...

Страница 10: ...ty becomes null and void if Customer modifies or alters the equipment in any way other than as specifically authorized by ADTRAN EXCEPT FOR THE LIMITED WARRANTY DESCRIBED ABOVE THE FOREGOING CONSTITUT...

Страница 11: ...distributor first If your local distributor cannot help please contact ADTRAN Technical Support and have the unit serial number available The Custom Extended Services ACES program offers multiple type...

Страница 12: ...most popular products These courses include overviews on product features and func tions while covering applications of ADTRAN s product lines ADTRAN provides a va riety of training options including...

Страница 13: ...twork Status Red 1 2 Test Status Error Yellow Red 1 3 Test Switches 1 3 Rear Panel 1 4 Chapter 2 Installation Unpack Inspect Power Up 2 1 Contents of Shipping Package 2 1 Customer Provides 2 1 Power U...

Страница 14: ...7 2 4 Down 56 Kbps 2 4 Up 64 kbps 2 4 Scrambler SW 8 2 4 Down On 2 4 Up Off 2 4 Network Connections 2 5 DTE Connections 2 5 Chapter 3 Test Modes Self Test 3 1 Near End Tests 3 2 DTE Only Test 3 2 DTE...

Страница 15: ...List of Figures Figure 1 1 DSU 56 64 Unit 1 2 Figure 1 2 DSU 56 64 Rear Panel 1 4 Figure 3 1 DTE Only Test Diagram 3 2 Figure 3 2 DTE with TP Test Diagram 3 4 Figure 3 3 DTE and LoopTest Diagram 3 5...

Страница 16: ...List of Figures xvi DSU 56 64 User Manual 61200062L1 1...

Страница 17: ...61200062L1 1 DSU 56 64 User Manual xvii List of Tables Table 2 1 Default Option Switch Settings 2 5 Table A 1 Pinouts for RJ 48S Network Connections A 1 Table A 2 V 35 DTE Pinouts A 2...

Страница 18: ...List of Tables xviii DSU 56 64 User Manual 61200062L1 1...

Страница 19: ...the interface between telco provided Digital Data Service DDS and the customer s Data Terminal Equipment DTE The DSU 56 64 supports both 56 kbps and 64 kbps loop service rates with the DTE interface...

Страница 20: ...t LED Identification DTE Status Green Network Status Red SELECT ERROR PTRN RDL TEST LOOP DTE TEST DSU 56 64 CD RD TD CS RS ALM Indicator Definition Source RS CS TD RD CD Request To Send Clear To Send...

Страница 21: ...oop interface test CSU or DSU Loopback has been initiated by telco RDL ON SOLID indicates remote digital loopback test has been initiated from the local DSU FLASHING indicates remote digital loopback...

Страница 22: ...ts on page A 2 Figure 1 2 DSU 56 64 Rear Panel All setup or configuration parameters for the DSU 56 64 are selected with an eight position DIP switch This switch labeled OPTIONS is accessible from the...

Страница 23: ...ADTRAN Customer and Product Service CAPS If possible keep the original shipping container for use in returning the unit for repair or for verification of damage during shipment Contents of Shipping P...

Страница 24: ...is accessible from the rear panel A chart showing the options and switch settings is attached to the bottom of the unit Clear To Send CS SW 1 Down Normal In the down position CS follows the RS lead wi...

Страница 25: ...ated every second while RS is active When the antistream time out expires the DSU 56 64 stops transmitting DTE data into the network It does however continue to accept data CS is maintained in the act...

Страница 26: ...s Up 64 kbps The network interface is configured for 64 kbps operation Scrambler SW 8 For 64 kbps clear channel operation there is a possibility that the DTE data sequenced might mimic network loop ma...

Страница 27: ...TIONS The Data Terminal Equipment DTE is attached to the connector labeled PRIMARY V 35 at the rear of the DSU 56 64 The pinout for the V 35 DTE connector is shown in Table A 2 on page A 2 Table 2 1 D...

Страница 28: ...Chapter 2 Installation 2 6 DSU 56 64 User Manual 61200062L1 1...

Страница 29: ...the front panel turn on simultaneously for approximately two seconds 2 After two seconds all the LEDs turn off briefly 3 The LEDs then cycle on in pairs with a fan out pattern away from the ALM indic...

Страница 30: ...EST The DTE ONLY test can test both the DTE interface of the local DSU 56 64 plus its loop transmitter and receiver For this test the loop transmit data is connected to the loop receive data at a poin...

Страница 31: ...coded and returned to the terminal or test equipment where it is checked for any bit errors DTE WITH TEST PATTERN TP The DTE WITH TP test is similar to the DTE ONLY TEST described in Figure 3 1 on pag...

Страница 32: ...o the transmit data stream by pressing SELECT and observed by watching the ERROR LED turn on for a brief period of time As previously mentioned the DTE WITH TP is automatically performed during the se...

Страница 33: ...Figure 3 3 illustrates the loopback points and the signal paths for this test The DTE AND LOOP LEDs flash during initialization of the test and turn on solid once the test is in progress Figure 3 3 DT...

Страница 34: ...interface is ignored for this test The LOOP LED flashes during initialization of the test and turns on solid once the test is in progress Figure 3 4 illustrates the loopback point and the signal path...

Страница 35: ...indicator 2 Press TEST while this test indicator is on 3 To terminate this test press TEST RDL with Test Pattern TP When the RDL WITH TP test is initiated at the local DSU 56 64 the local DSU command...

Страница 36: ...synchronization is achieved the ERROR indicator is turned off The ERROR indicator turns on when errors in the receive data pattern are detected While this test is active errors can be injected into th...

Страница 37: ...the end to end performance of the circuit Both the CSU LOOPBACK and the DSU LOOPBACK tests are activated from the telephone company diagnostic test equipment and are used to isolate trouble on a circu...

Страница 38: ...Chapter 3 Test Modes 3 10 DSU 56 64 User Manual 61200062L1 1...

Страница 39: ...Network Connections Pin Number Function Signal Direction 1 Transmit Data R From Customer to Network Interface 2 Transmit Data T From Customer to Network Interface 3 6 Not Used N A 7 Receive Data T 1 F...

Страница 40: ...SR F 109 Receive Line Signal Detector CD R 104 Received Data RD A T 104 Received Data RD B V 115 Receiver Signal element Timing SCR A X 115 Receiver Signal Element Timing SCR B P 103 Transmitted Data...

Страница 41: ...unted on a wall This section describes the standard specifications and features incorporated in the DSU 56 64 Loop Interface 4 wire full duplex Line Requirements Local loop specifications perAT T Pub...

Страница 42: ...f test Local loopback V 54 activated remote loopback with 2047 test pattern DTE data data from external test set Power 115 VAC 4 Watts maximum Environment Operating Temperature 0o C to 50o C 32o F to...

Страница 43: ...t 3 4 DTE connections 2 5 DTE status LED identification 1 2 DTE with TP test 3 3 DTE only test 3 2 E environmental specifications B 2 F Far End Tests 3 7 FCC radio frequency interference viii FCC regu...

Страница 44: ...ing damage what to do 2 1 shipping package contents of 2 1 specifications B 1 T technical support how to contact xi test modes 3 1 DTE and Loop Test 3 4 DTE with Test pattern test 3 3 DTE only test 3...

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