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Lucent Technologies DEFINITY Enterprise Communications Server Release 6 Instructions Manual

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    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-15 DS1 CPE Loopback Jack (T1 Only) 
    6
    A problem can exist in 1 or more of the 3 sections. The field technician is 
    responsible for finding and correcting problems in the first 2 sections. The DS1 
    service provider is responsible for finding and correcting problems in the third 
    section. Testing is divided into 3 steps. 
    nTest customer premises wiring (section 1 in the following 3 figures) from 
    the ICSU to the loopback jack as described in “DS1 Span Test.”
    nTest the CO-to-network interface wiring (section 3 in Figure 6-1) using the 
    Smart Jack loopback (CO responsibility). Coordinate this test with the DS1 
    provider.
    nTest the short length of customer premises wiring (section 2 in the 
    following 3 figures) between the loopback jack and the Smart Jack. This 
    can be done using a loopback that “overlaps” section 2 of the cable. Any 
    of the following loopbacks can do this:
    a. The local ICSUs line loopback, which is typically activated, tested, 
    and then deactivated by the DS1 service provider at the CO end. 
    b. The local DS1 interface’s payload loopback, activated and tested 
    by the DS1 service provider at the CO end. 
    c. The far-end ICSU’s line loopback. This test is activated at the 
    management terminal by entering test ds1-loop  
    far-csu-loopback-test-begin. The test is terminated by entering 
    test ds1-loop  end-loopback/span-test. Bit error 
    counts are examined as described in “DS1 Span Test.” This test 
    method is the least preferable because it covers wiring that is not in 
    the local portion of the span. This test only isolates problems to 
    section 2 wiring if there are no problems in the wiring between the 
    far-end CO and the far-end ICSU. Coordinate this test with the DS1 
    service provider. 
    If any of the above tests (a, b, or c) fail, a problem is indicated in section 2 
    as long as the tests for section 1 and section 3 pass. Since section 2 
    includes the network interface point, it is necessary to work with the 
    service provider to isolate the fault to the loopback jack cable, the “dumb” 
    block, or the Smart Jack. 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-16 DS1 CPE Loopback Jack (T1 Only) 
    6
    Figure 6-1. Network Interface at Smart Jack Figure Notes:
    1. Span Section 1
    2. Span Section 2
    3. Span Section 3
    4. 120A2 (or later) Integrated 
    Channel Service Unit (ICSU)5. RJ-48 to Network Interface (Up to 1000 
    Feet) (305 m)
    6. Loopback Jack
    7. Network Interface Smart Jack
    8. Interface Termination or Fiber MUX
    9. Central Office 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-17 DS1 CPE Loopback Jack (T1 Only) 
    6
    Figure 6-2. Network Interface at Extended Demarcation Point (Smart Jack 
    Inaccessible) Figure Notes:
    1. Span Section 1
    2. Span Section 2
    3. Span Section 3
    4. 120A2 (or later) Integrated 
    Channel Service Unit (ICSU)
    5. RJ-48 to Network Interface 
    (Up to 1000 Feet) (305 m)6. Loopback Jack
    7.“Dumb” Block (Extended Demarcation)
    8. Network Interface Smart Jack
    9. Interface Termination or Fiber MUX
    10. Central Office 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-18 DS1 CPE Loopback Jack (T1 Only) 
    6
    Figure 6-3. Network Interface at Extended Demarcation Point (Smart Jack 
    Accessible) Figure Notes:
    1. Span Section 1
    2. Span Section 2
    3. Span Section 3
    4. 120A2 (or later) Integrated 
    Channel Service Unit (ICSU)
    5. RJ-48 to Network Interface 
    (Up to 1000 Feet) (305 m)6.“Dumb” Block (Extended Demarcation)
    7. Loopback Jack
    8. Network Interface Smart Jack
    9. Interface Termination or Fiber MUX
    10. Central Office
    11. “Dumb” Block to Smart Jack RJ-48 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-19 DS1 CPE Loopback Jack (T1 Only) 
    6
    Configurations Without a Smart Jack
    When the loopback jack is added to a span that does not contain a Smart Jack, 
    the span is divided into 2 sections. See Figure 6-4
     and Figure 6-5.
    1. ICSU to the loopback jack.
    2. Loopback jack to the Central Office (CO).
    Figure 6-4.Network Interface at “Dumb” Block Figure Notes:
    1. Span Section 1
    2. Span Section 2
    3. 120A2 (or later) Integrated 
    Channel Service Unit (ICSU)
    4. RJ-48 to Network Interface 
    (Up to 1000 Feet) (305 m)5. Loopback Jack
    6.“Dumb” Block (Demarcation Point)
    7. Interface Termination or Fiber MUX
    8. Central Office 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-20 DS1 CPE Loopback Jack (T1 Only) 
    6
    Figure 6-5.Network Interface at “Dumb” Block with Repeater Line to Fiber 
    MUX
    Section 2 includes the short cable from the loopback jack to the “dumb” block 
    demarcation point (part of the loopback jack). This is the only portion o f section 
    2 that is part of customer premises wiring but is not covered in the loopback 
    jack’s loopback path.  Figure Notes:
    1. Span Section 1
    2. Span Section 2
    3. 120A2 (or later) Integrated 
    Channel Service Unit (ICSU)
    4. RJ-48 to Network Interface 
    (Up to 1000 Feet) (305 m)5. Loopback Jack
    6. “Dumb” Block (Demarcation Point)
    7. Repeater
    8. Fiber MUX
    9. Central Office 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-21 DS1 CPE Loopback Jack (T1 Only) 
    6
    A problem can exist in 1 or both of the 2 sections. The field technician is 
    responsible for finding and correcting problems in section 1 and the loopback 
    cable portion of section 2. The DS1 service provider is responsible for finding 
    and correcting problems in the majority of section 2. Testing is divided into 2 
    steps.
    1. Test customer premises wiring (section 1 in Figure 6-4
    ) from the ICSU to 
    the loopback jack as described in the “DS1 Span Test” section.
    2. Test the loopback jack-to-”dumb” block and ”dumb” block-to-CO wiring 
    (section 2 in Figure 6-4
    ). This can be done using a loopback that 
    “overlaps” the section of the span. Any of the following loopbacks can do 
    this:
    a. The local ICSUs line loopback, which is typically activated, tested, 
    and then deactivated by the DS1 service provider at the CO end.
    b. The local DS1 interface’s payload loopback, activated and tested 
    by the DS1 service provider at the CO end. 
    c. The far-end ICSU’s line loopback. This test is activated at the 
    management terminal by entering test ds1-loop  
    far-csu-loopback-test-begin. The test is terminated by entering 
    test ds1-loop  end-loopback/span-test. Bit error 
    counts are examined as described in the “DS1 Span Test” section. 
    This test only isolates problems to section 2 wiring if there are no 
    problems in the wiring between the far-end CO and the far-end 
    ICSU. Coordinate this test with the DS1 service provider. 
    If any of the above tests (a, b, or c) fail, a problem is indicated in 
    section 2. This could mean bad loopback jack -to-”dumb” block 
    cabling, but is more likely to indicate a problem somewhere 
    between the “dumb” block and the CO. This is the responsibility of 
    the DS1 service provider. If the DS1 Span Test confirms that there 
    are no problems in section 1, the technician should proceed as 
    follows to avoid unnecessary dispatch.
    nIdentify and contact the DS1 service provider
    nInform the DS1 provider that loopback tests of the CPE 
    wiring to the “dumb” block (section 1) showed no problems
    nIf the far-end ICSU line loopback test failed, inform the DS1 
    provider
    nRequest that the DS1 provider perform a loopback test of 
    their portion of the section 2 wiring by sending someone out 
    to loop section 2 back to the CO at the “dumb” block. 
    If this test fails, the problem is in the service provider’s 
    wiring. 
    If the test passes, the problem is in the cable between the 
    loopback jack and the “dumb” block. Replace the loopback 
    jack. 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-22 DS1 CPE Loopback Jack (T1 Only) 
    6
    Configurations Using Fiber Multiplexers
    Use the loopback jack when customer premises DS1 wiring connects to an 
    on-site fiber multiplexer (MUX) and allows wiring to the network interface point on 
    the MUX to be remotely tested. This requires that ICSUs be used on DS1 wiring 
    to the MUX.
    Fiber MUXes can take the place of Interface termination feeds as shown in Figure 
    6-1 , Figure 6-2, Figure 6-3, and Figure 6-4. Test these spans using the same 
    procedures as metallic spans. Note the following points:
    1. Fiber MUXes may have loopback capabilities that can be activated by the 
    service provider from the CO end. These may loop the signal back to the 
    CO or back to the DS1 board. If the MUX provides the equivalent of a line 
    loopback on the “problem” DS1 facility, this may be activated following a 
    successful loopback jack test and used to isolate problems to the wiring 
    between the loopback jack and the MUX.
    2. Be aware that there are installations that use repeatered metallic lines 
    between the MUX and the “dumb” block. These lines require DC power for 
    the repeaters and this DC power is present at the “dumb” block interface 
    to the CPE equipment. 
    A loopback jack is required in this configuration to 
    properly isolate and terminate the DC power
    .
    To check for the presence of DC, make the following 4 measurements at the 
    network interface jack:
    1. From Transmit Tip (T, Pin 5) to Receive Tip (T1, Pin 2)
    2. From Transmit Ring (R, Pin 4) to Receive Ring (R1, Pin 4)
    3. From Transmit Tip (T, Pin 5) to Transmit Ring (R, Pin 4)
    4. From Receive Tip (T1, Pin 2) to Receive Ring (R1, Pin 4)
    All measurements should read 0 (zero) volts DC. For pin numbers and pin 
    designations, refer to 
    Integrated Channel Service Unit (ICSU) Installation and 
    Operation
    , 555-230-193.
    Operating Charasteristics
    If a TN464F or TN767E and a 120A2 were installed in a system running pre-G3V3 
    software and the software is later upgraded to G3V3 Release 3 or later, reseat 
    the DS1 circuit pack so that the ICSU administration fields will appear on the DS1 
    administration form. 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-23 Facility Test Calls 
    6
    Facility Test Calls
    The Facility Test Calls feature allows you to use a voice terminal to make test 
    calls to specific trunks, time slots, tones, and tone receivers within the system. 
    The test call verifies that the accessed component is functioning properly. To use 
    this feature, it must be enabled on the Class of Restriction form, and you must 
    know the Facility Test Call Access Code. The code can be retrieved by entering 
    display feature-access-codes. It appears on page one of the screen output.
    NOTE:
    For the ISDN-PRI Test Call feature see ‘‘Troubleshooting ISDN-PRI Test Call 
    Problems’’ in Chapter 5, ‘‘Responding to Alarms and Errors’’.
    NOTE:
    The following test call descriptions are for voice terminal users:
    Trunk Test Call
    The trunk test call accesses specific Tie or CO trunks, including DS1 trunks. If the 
    trunk is busied out by maintenance, it will be temporarily released for the test call 
    and returned to busyout afterwards. Before making the test call, use list 
    configuration to determine the location of the trunk ports that you which to test. 
    DID trunks cannot be accessed.
    To place a trunk test call:
    1. Dial the FAC described above and listen for dial tone.
    2. Dial the 7-digit port location UUCSSpp:
    UU= Cabinet number (01 for PPN, 02 -- 44 for EPNs)
    C = Carrier number (A=1, B=2, C=3, D=4, E=5)
    SS = Slot number (01--20)
    pp = Port circuit number (01--24)
    The channels on a DS1 trunk are addressed by using the channel number 
    for the port number.
    3. Listen for one of the following tones:
    Dial tone or Silence The trunk is connected. Go to step 4.
    Busy Tone  The trunk is either busy processing a call or 
    is out of service. Check status trunk. 
    						
    							DEFINITY Enterprise Communications Server Release 6
    Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
    January 1998
    Additional Maintenance Procedures 
    Page 6-24 Facility Test Calls 
    6
    4. Place a call. If the call does not go through (no ringing is heard) check to 
    see if the circuit has been removed or if the trunk is a rotary trunk.
    The dial tone heard is coming from the far-end. If the far end has been 
    disabled, you will not hear dial tone. However, depending on far-end 
    administration, you may still be able to dial digits. All digits dialed after the 
    port number are transmitted using end-to-end DTMF signaling. If the trunk 
    being tested is a rotary trunk, it is not possible to break dial tone.
    DSO Loop-Around Test Call
    The DS0 Loop Around feature provides a loop around connection for incoming 
    Non-ISDN DS1 trunk data calls. This feature is similar to the far end loop around 
    connection provided for the ISDN Test Call feature. This DS0 loop around is 
    provided primarily to allow a network service provider to perform facility testing at 
    the DS0 level before video teleconferencing terminals are installed at the PBX.
    The feature is activated on a call-by-call basis by dialing a test call extension 
    specified on the second page of the System Parameters Maintenance form. No 
    special hardware is required. When the test call extension is received by the 
    PBX, a non inverting 64 kbps connection is set up on the PBXs Time Division 
    Multiplexed bus. More than one loop around call can be active at the same time.
    For calls routed over the public network using the ACCUNET Switched Digital 
    Service (SDS) or Software Defined Data Network (SDDN), the data transmission 
    rate is 56 Kbps since robbed bit signaling is used. For calls established over a 
    private network using common channel signaling, the full 64 kbps data rate is 
    available.
    When the incoming trunk group is used only for data calls (SDS), the 
    Communications Type on the associated Trunk Group form should be set to 
    “data”. When the incoming trunk group is used for robbed bit alternate voice 
    and/or data (SDN/SDDN), the Communications Type on the Trunk Group form 
    should be set to “rbavd” (robbed bit alternate voice data). For private network 
    trunks using common channel signaling, the Communications Type on the 
    associated Trunk Group form can be set to “avd”.Reorder tone The trunk requested is in a different port 
    network from your station, and inter-PN 
    resources are not available to access it.
    Intercept Tone  The port addressed is not a trunk, or it is a 
    DID trunk, or the trunk is not administered.
    Confirmation Tone The port is a tone receiver. See the ‘‘
    DTMR 
    Test Call’’ section. 
    						
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