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PROJECT MANAGER DEFENSE COMMUNICATIONS AND ARMY SWITCHED SYSTEMS COL David W. Ludwig IPTP Brief 13 July 2001.

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Presentation on theme: "PROJECT MANAGER DEFENSE COMMUNICATIONS AND ARMY SWITCHED SYSTEMS COL David W. Ludwig IPTP Brief 13 July 2001."— Presentation transcript:

1 PROJECT MANAGER DEFENSE COMMUNICATIONS AND ARMY SWITCHED SYSTEMS COL David W. Ludwig IPTP Brief 13 July 2001

2 To discuss the SIEMENS Elektronisches Waehl System Digital (EWSD) open Discrepancy Reports (TDR’s) which affect Worldwide Certification Test PURPOSE

3 BACKGROUND TDR DISCUSSIONS SUMMARY AGENDA

4 The EWSD switch has been performing successfully at S/W Release 16 in the European Network since August of 2000 with no significant user issues S/W Release 18 was certified on 27 Apr 01 for use in the DISN-E Variety of Government requirements documents; CJCSI /GSCR/SIC 94, 98/LSSGR/ANSI/Contract EWSD upgrades to S/W Release 18 in May and June 2001 are performing successfully The TDR’s have been identified as critical to obtaining Worldwide Certification Briefing will focus on these, but all of the TDR’s can be discussed in depth BACKGROUND

5 - TDR DESCRIPTION The EWSD does not currently provide Method 2 trunk route selection in accordance with GSCR Paragraph TDR DISCUSSION Method 2 steers a call preemption to the primary route, before searching for idle trunks in alternate routes. Method 2 trunk route selection does not appear to be used by the Army in CONUS or Europe. Contractor is committed to providing Method 2 route selection in EWSD S/W Release 19. Method 2 trunk route selection should not be critical for global certification. TDR (Method 2 Route Selection for Preemption) TDR DISCUSSIONS

6 - TDR DESCRIPTION The EWSD is unable to complete all calls regardless of their precedence as a result of an adjacent switch and/or a transmission failure. Abnormal trunking situations (Wink and Glare irregularities) TDR (Method 1 Route Selection for Preemption During an Alternate Route Connection Failure), TDR (Method 1 Route Selection for Preemption {All Precedence Levels} During a Direct Route Connection Failure), TDR (Handling of Precedence Calls During a Multiple Glare Hold Condition), and TDR (Handling of Precedence Calls During a Multiple Glare Release Condition). TDR DISCUSSIONS

7 - TDR DISCUSSION CJCSI discusses Military unique requirements and Military unique features. - Assured services to “optimize call completion rates”. - Special C2 users (Flash/Flash override) will be provided with Non-Blocking service. - Multi Level Precedence Preemption (MLPP) by itself can not assure a totally Non- Blocking network (Block Precedence Announcements (BPA) and Transmissions Systems). - A total Non-Blocking network will not be cost effective in accordance with CJCSI Enclosure A, Paragraph 6F. -Under Exceptional procedure if the network cannot complete a precedence call request the calling party should receive a blocked precedence announcement (GSCR Paragraph ). - The GSCR provides implementation instructions for Military features. Preemption Techniques - JIEO 8249 (GSCR) Paragraph states that calls failing to find an idle trunk in the direct route or any alternate route will enter a preemptive search for a trunk. - In the JITC test there were always idle trunks available; preemption was not appropriate. TDR DISCUSSIONS

8 - TDR DISCUSSION Call Processing - Paragraphs and of the GSCR state how call processing should be done by the DSN switch. Both paragraphs point to the requirements of Section 5 of the LSSGR (commercial) unless specifically instructed differently. In the cases of these TDRs the GSCR does not instruct differently. - Section 5 of the LSSGR cross-references Section 6 of the LSSGR which addresses wink start and glare abnormalities in detail. - Under abnormal conditions the LSSGR requires the switch reselect another trunk. If the reselected trunk behaves abnormally, the call should be sent to reorder tone. - The EWSD has features that can monitor and manage trunk irregularities. - The EWSD behaves IAW the GSCR and the LSSGR (commercial standards). TDR DISCUSSIONS

9 - TDR DESCRIPTION The EWSD does not implement the route control digit. - TDR DISCUSSION There is no documented requirement in the GSCR for the route control digit. The requirement in the System Interface Criteria (SIC) versions of 1994, 1998, and 2000 describe route control digit as “optional”. The only locations where the route control digit may be used is in the MCI CONUS backbone switches. There are no instructions for implementing the route control algorithm in the System Interface Criteria versions of 1994, 1998, and If the EWSD were to implement route control digit requirements as stated in the System Interface Criteria versions of 1994, 1998, and 2000, the result would likely cause interoperability problems. Route Control Digit is for MF 2/6 CAS signaling only (not SS7). EWSD provides robust routing control (demonstrated at the JITC). TDR (Route Control Digit) TDR DISCUSSIONS

10 - TDR DESCRIPTION The EWSD does not provide 4 logical circuits over one physical interface for network management. - TDR DISCUSSION The System Interface Criteria requires “4 distinct circuits”, not 4 logical circuits. The EWSD provides 4 distinct circuits on three physical X.25 ports. The Dual Data Port (DDP) and Enhanced Dual Data Port (EDDP) provide the means to transport these circuits to the Army and DISA simultaneously The EWSD meets LSSGR requirements. The DDP has been working successfully since August PM DCASS supports the implementation of a direct network management interface between the Advanced DSN Information Management Support System (ADIMSS) and the EWSD. PM DCASS is awaiting testing by the JITC of a direct network management interface between the ADIMSS and the EWSD. Results of EDDP testing at the JITC provides a high confidence level that the EWSD will successfully provide the direct network management interface. TDR (Four Logical Circuits Per X.25 Physical Connection) TDR DISCUSSIONS

11 - TDR DESCRIPTION The Remote Switching Unit does not differentiate between incoming and outgoing peg counts. - TDR DISCUSSION RSU is connected to the host EWSD, not directly to the DSN backbone. - All traffic management reports required are provided and total peg count is accurate. - Impact of RSU traffic is properly accounted for on the DSN backbone by the host switch. There are other methods to manage the network; depending on traffic data is only one method. Should not be critical for global certification. Siemens has committed to fix this in a future S/W Release. TDR (RSU Traffic Report Outgoing Peg Counts) TDR DISCUSSIONS

12 TDR (Attendant Console Class of Service Display) - TDR DESCRIPTION The EWSD attendant console did not provide a class of service display as required by GSCR Paragraph TDR DISCUSSION Class of Service in the LSSGR is a collection of attributes (Precedence Level and Calling Area of individual subscribers?) DISN-E Class of Service provided to attendant through SCCNMS Dial Service Assistance (DSA) console. Class of Service database in DSA console is synchronized to Precedence Level and Calling Area settings for each subscriber in the associated switch database. Not required for most Army CONUS switches and should not be critical for global certification. TDR DISCUSSIONS

13 The EWSD has been successfully operating within the DISN-E since August 2000 There are inconsistencies among the government requirements documentation Requirements documentation and implementation guidance point to commercial practices The EWSD is a commercial switch competitively awarded under commercial acquisition procedures These TDR’s should not prohibit Worldwide Certification The operational risk presented by these TDRs is low and should not prohibit Worldwide Certification SUMMARY


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