*COMDECK DRHDIMS
# * * * * * * * * * * ----------  DRHDR  ---------- * * * * * * * * *  #
*IF DEF,IMS 
 #
*1DC  DRHDR 
* 
*     DRHDR CONTAINS THE TEMPLATE FOR THE DATA RING HEADER WORD. EACH 
*     DATA POT IN NIP-S FIELD LENGTH HAS A DATA RING HEADER ASSOCIATED
*     WITH IT. BASICALLY IT IS USED TO CHAIN TOGETHER DATA POTS QUEUED
*     ON THE SAME CONNECTION SO AS TO SPEED UP THE QUEUEING AND DE- 
*     QUEUEING PROCESS WITHIN NIP. IT HAS THE FOLLOWING FORMAT: 
* 
*                      2         4        5 
*      0        6      4         2        9 
*     I--------I------I---------I---------I 
*     I        I      I         I         I 
*     I DRID   I DRBS I BACKPTR I NEXTPTR I 
*     I        I      I         I         I 
*     I--------I------I---------I---------I 
* 
* 
*     WHERE : 
* 
*        DRID    = DATA RING BLOCK ID = 7.
*        DRBS    = DATA RING BLOCK SIZE.
*        BACKPTR = DATA RING BACK POINTER. POINTS TO FWA OF LAST DATA 
*                  POT WHICH HEADS THIS DATA POT IN THE RING. 
*        NEXTPTR = DATA RING NEXT POINTER. POINTS TO FWA OF NEXT DATA 
*                  POT WHICH TRAILS THIS DATA POT IN THE RING.
* 
 #
*ENDIF
