Installation guide

SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
ix Revision: 2002-09-10
11.3.3 EMC..........................................................................................................108
11.4 Physical Dimensions....................................................................................................108
11.4.1 LTU ..........................................................................................................108
11.4.2 NTU..........................................................................................................108
12 Firmware Download ............................................................................................................................109
12.1 Download Procedure...................................................................................................109
12.2 Download transport via ACU..........................................................................................110
12.3 Download transport via CMU.........................................................................................111
12.4 Download transport via Modem Chain.............................................................................112
12.5 Remote Firmware Download Procedure...........................................................................112
13 Diagnostics and Troubleshooting.........................................................................................................114
13.1 Test Loops.................................................................................................................114
13.2 Hints for Troubleshooting..............................................................................................115
13.2.1 Problems...................................................................................................115
13.2.2 Initialization Errors.......................................................................................116
14 Appendix.............................................................................................................................................117
14.1 Abbreviations.............................................................................................................117
14.2 Referenced Documents................................................................................................119
Figures
Figure 3-1: Clock Sources.........................................................................................................13
Figure 3-2: Synchronous Operation (=”Loop Timing”) ....................................................................13
Figure 3-3: External Clock Mode ................................................................................................14
Figure 3-4: Reference Points of the PRA ......................................................................................15
Figure 3-5: Digital Link without CRC Processing............................................................................16
Figure 3-6: Digital Link with CRC Processing in the NT1..................................................................17
Figure 3-7: Digital Link with CRC Processing in the LT and NT1........................................................18
Figure 3-8: Digital Link with CRC Monitoring in the NT1..................................................................19
Figure 3-9: Time Slot Mapping: 16 frE1 Time Slots to E1.................................................................24
Figure 3-10: Time Slot Mapping: 16 nx64 Time Slots to nx64 ..........................................................24
Figure 3-11: Time Slot mapping: 16 nx64 Time Slots to E1..............................................................24
Figure 3-12: Time Slot mapping: 16 nx64 Time Slots and 16 frE1 Time Slots to E1 ..............................25
Figure 3-13: TMN Bus 4-Wire Connection for Minirack Units............................................................27
Figure 3-14: TMN Bus 2-Wire Connection for Minirack Units............................................................27
Figure 3-15: TMN Bus 2-Wire Connection for Plug-in Units..............................................................28
Figure 3-16: Termination for Long TMN Bus.................................................................................29
Figure 4-1: E1 G.826 Performance Evaluation...............................................................................32
Figure 4-2: PRA G.826 Performance Evaluation.............................................................................33
Figure 6-1: Line feed current vs loop resistance for different NTU power consumptions.........................41
Figure 7-1: LTU Interface Addressing Scheme...............................................................................43
Figure 8-1: Examples of Multipoint Configuration...........................................................................79
Figure 8-2: Cascading of Multipoint LTUs.....................................................................................85