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Table 8-3 (Page 4 of 4). TH, RH, and RU Definitions for the Host Request
Byte
Bit
Value
Meaning
RU34
RTM DEFINITION
X'OO'
Reserved
X'OI'
First character on screen
X'02'
Keyboard usable
X'03'
CD/EB
Other code points reserved
RU35
X'OO'
RTM time increment
=
100 msec
RU36
X'OO 00 00
Reserved
through
000000'
RU41
RU42
0-3
b '0000 ,
Reserved
4-7
b '0---'
Number of boundaries (1-4)
RU43
X ,----,
Boundary, if appropriate
RU44
(must be in increasing value)
RU45
X ,----,
Boundary, if appropriate
RU46
RU47
X ,----,
Boundary, if appropriate
RU48
RU49
X'----'
Boundary, if appropriate
RU50
--
Notes:
1.
The 3708 SSCP-PU session is defined as FM profile 0 and TS profile I
(half-duplex definite response). Should the 3708 transmit an inbound message, it
waits for a response (positive or negative) before transmitting or receiving
additional messages on that session. If a response is somehow lost by the
network, no other SSCP-PU activity is possible without first receiving an
ACTPU. Data may be lost during recovery.
2. Because of the characteristics of the SSCP-PU session, the 3708 defaults to
contention state. Should an alert, 3708 RTM response, or RECFMS be queued
for inbound transmission, the 3708 goes into send state and rejects all outbound
messages on that session until that message is transmitted and a response is
received. Error recovery is the responsibility of the upstream node.
3. If the 3708 receives a host request with RU28 bits 3 or 6, RU29 bits I - 7, or the
corresponding bits in RU30-31, it rejects the request.
4. RU-33 is ignored.
5. All other bytes are considered "sender checks" and indeterminate results occur if
there are problems within them.
6. RTM statistics are only accumulated for devices while they are in LU-LU
sessions (SNA only).
7. The RTM control vector key (X'94') and RTM request vector key (X'92') are
applied immediately if no inbound RUs are to flow. Otherwise, they are applied
after the requested data for each LU has been transmitted, not after the response
has been received. The current data is reset if RU24 bit 0= I in the request
Chapter 8. Network Management and Problem Determination
8-27
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