- Entry:
- ARP or ARS
- VIT option:
- HPR
- Event:
- Any session data reply is sent over an RTP connection using Responsive Mode ARB
- VIT processing module:
- ISTITCHR
- Control is returned to:
- ISTRPCAR
This trace record is written when a session data reply
is sent across an RTP connection using Responsive Mode ARB, or when
simulating a slowdown reply. It contains statistical information about
the session data. 
- Byte (hex)
- Contents
- 00–03
- Record ID:
- C"ARP" for real reply
- C"ARS" for simulated reply
- 04
- ID is the primary address space ID (ASID). This field is 0 if the ASID is greater than X'FF'.
- 05
- 0
- 06–07
- Phase flags (ARB2_PHASE_FLAGS, ARB2_PHASE_FLAGS2)
- Bit
- Meaning
- 1... .... .... ....
- Conservation phase
- .1.. .... .... ....
- Medium aggressive phase
- ..1. .... .... ....
- Send setup segment
- ...1 .... .... ....
- High flag
- .... 1... .... ....
- Delay change sum flag
- .... .1.. .... ....
- Upward cycle flag
- .... ..1. .... ....
- Idle - no data has been sent recently
- .... ...1 .... ....
- Startup
- .... .... 1... ....
- Last parity bit received on an ARB rate request
- .... .... .1.. ....
- Current ARB request parity bit
- .... .... ..11 1111
- Not used
- 08–09
- High steps (ARB2_HIGH_STEPS) – the number of successive normal rate increases above the current shared link rate
- 0A–0B
- Aggressive steps (ARB2_AGGRESSIVE_STEPS)
- 0C–0F
- Measurement interval in milliseconds (ARB2_MEASURE_INT)
- 10–11
- Burst interval in milliseconds (ARB2_BURST_INTVL)
- 12–13
- Downward gamma value (ARB2_DOWN_GAMMA)
- 14–17
- Gamma value
- 18–1B
- NCB address
- 1C–1F
- Request parameter header (RPH) address