- Entry:
- RTP
- VIT option:
- HPR
- Event:
- Dispatch of a rapid transport protocol (RTP) PAB
- VIT processing module:
- ISTITCHR
- Control is returned to:
- ISTRPCRT
This trace record is written when an RTP PAB is dispatched.
The entry contains RTP state and adaptive rate-base congestion control
(ARB) information. 
- Byte (hex)
- Contents
- 00–03
- Record ID: C"RTP"
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- Number of retries (RPN_NUM_RETRY)
- 06
- RTP path switch fields:
- Bit
- Meaning
- 1... ....
- Path switch—Waiting for LU-LU session services or topology and routing services (RPN_WAIT_PSWCH)
- .1.. ....
- Path switch—Waiting for partner (RPN_WAIT_PS_STAT)
- ..1. ....
- Back pressure applied (RPN_BACK_PRESSURE)
- ...1 ....
- Status pending (RPN_STATUS_PENDING)
- .... 1...
- Last message bit set in the NLP transport header (RPN_LAST_MSG)
- .... .1..
- Path switch in progress (RPN_PSWCH_STATE)
- .... ..1.
- Modify RTP command in progress (RPN_MRTP)
- .... ...1
- Allow reporting of lost data (RPN_REPORT_GAPS)
- 07
- ARB Flags:
- Bit
- Meaning
- 1... ....
- Echo pending (RPN_ECHO_PENDING)
- .1.. ....
- GAP pending (RPN_GAP_PENDING)
- ..xx ....
- Mode (ARB_MODE):
- 00
- Green
- 01
- Yellow
- 10
- Red
- .... xxxx
- Unused; available
- 08–0B
- Last byte sequence number sent (RPN_NEXT_BYTE_XMIT)
- 0C–0F
- Last byte sequence number received (RPN_LAST_BYTE_RCV)
- 10
- RTP connection state (RPN_CONN_STATE)
- 11
- Timers:
- Bit
- Meaning
- 1... ....
- Burst timer expired.
- .1.. ....
- Short request timer expired.
- ..1. ....
- Liveness timer expired.
- ...1 ....
- HPRPST path switch timer expired.
- .... 1...
- Refifo timer expired.
- .... .1..
- New route timer for path switch expired.
- .... ..xx
- Unused; available
- 12–13
- Number of retransmitted NLPs (RPN_REXMITTED_NLPS)
- 14–17
- Number of bytes to send in the current burst interval (RPN_BYTES_TO_SEND)
- 18–1B
- RPNCB address
- 1C–1F
- Request parameter header (RPH) address