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  1.                                                                                 
  2. +-------------------------------------------------------------+                 
  3. | II07005                                                     |                 
  4. |         COMMUNICATIONS MANAGER/2 1.0  562125400             |                 
  5. |                                                             |                 
  6. |         SDLC                                                |                 
  7. |                                                             |                 
  8. |         Tips, Techniques, Questions and Answers             |                 
  9. |                                                             |                 
  10. |LAST UPDATE:  05/26/93                          BY: TLG      |                 
  11. |                                                             |                 
  12. +-------------------------------------------------------------+                 
  13. |                                                                               
  14. | 1. 05/26/93 AS/400 to Communications Manager/2 using SDLC                     
  15. |    for 5250WSF on a MULTIDROP TRIBUTARY LEASED                                
  16. |    NON-SWITCHED line.                                                         
  17. |                                                                               
  18. |    When connecting in this manner,                                            
  19. |                                                                               
  20. |    You must choose:  Line type Non-Switched                                   
  21. |                      Link station role Secondary                              
  22. |                                                                               
  23. |    and for ADDITIONAL PARAMETERS...MODEM PARAMETERS                           
  24. |                      LINE MODE Half-duplex.                                   
  25. |                                                                               
  26. |    When using a MODEM SHARE DEVICE you must also change                       
  27. |    the device driver entry in CONFIG.SYS to use                               
  28. |    the #Y parameter.                                                          
  29. |                                                                               
  30. |     Example:   DEVICE=C: CMLIB SDLCDD.SYS #Y                                  
  31. |                                                                               
  32. |    One of the symptoms is that when SDLC is setup                             
  33. |    as FULL DUPLEX, none of the other devices on the                           
  34. |    multi drop line can get a poll and will be hung.                           
  35. |                                                                               
  36. |    You may also see the following message                                     
  37. |    ACS2363 ALERT: The local node has detected                                 
  38. |    an inactive link condition and has deactivated                             
  39. |    the SDLC communication link.                                               
  40. |                                                                               
  41. |    When LINE MODE Half-duplex is used, it allows Line                         
  42. |    Turnaround to occur and will toggle the RTS line to                        
  43. |    allow other stations to communicate.                                       
  44. |    When LINE MODE Full-duplex is used. Request To Send                        
  45. |    will stay high all the time and no other                                   
  46. |    devices will communicate.                                                  
  47. |                                                                               
  48. |    The SDLC adapter and MPCA adapter supported by                             
  49. |    Communications Manager/2 do not support                                    
  50. |    full-duplex data transfer.  However, by                                    
  51. |    selecting Full-duplex, an SDLC adapter can be configured                   
  52. |    to operate efficiently on a full-duplex line.  If the                      
  53. |    line is full-duplex and is multi point or multi drop,                      
  54. |    you must set up Communications Manager/2                                   
  55. |    MODEM PARAMETERS LINE MODE                                                 
  56. +-------------------------------------------------------------+                 
  57. |KEYWORDS: CM2INFO CMINFO 562125400 0964137 100               |                 
  58. |         SDLC AS/400 5250EM MULTIDROP LEASED                 |                 
  59. |         AS400 CM CM2 OS/400 DLC FULL DUPLEX MULTIPLE        |                 
  60. |         POINT DROP                                          |                 
  61. |                                                             |                 
  62. +-------------------------------------------------------------+                 
  63.