Ca Parameters Explanation - IBM 3745 Service Functions

Display/Update CA
CA Parameters Explanation
The choice of the CA parameters depends on the machine configuration and
the NCP generation, as well as the host processors. Discuss these parameters
with the customer before you set them.
CDF - UPDATE : CA xx
INTERFACE A INTERFACE B
CHANNEL BURST LENGTH (4 TO 254) ==> xxx
==>
==>
==>
==>
==>
==>
==>
CHANNEL PRIORITY (L=LOW,H=HIGH) ==>
X
NSC ADDRESS (00 TO FF) ==> xx
DATA STREAMING (Y=YES,N=NO) ==>
X
HIGH SPEED DATA TRANSFER (Y=YES,N=NO) ==>
X
BYTE MULTIPLEXER CHANNEL (Y=YES,N=NO) ==>
x
DATA STREAMING SPEED (1 TO 3) ==>
X
(l=lMB, 2=2HB, 3=3MB)
ESC ADDRESS RANGE (00 TO FF) ==>
xx - xx
==>
===>
F1:END F3:ALARM F6:QUIT F7:BHD
Figure 9-46. CA Parameters (CA installed with TPS)
CHANNEL BURST LENGTH
Length of the burst which can be transferred between the CA and
the host. Enter an even number, from 4 to 254.
• For a block multiplexer or selector channel, the recommended
value is 64 with CADS and 254 with BCCA to allow a better CA
throughput.
• For a byte multiplexer channel, check for the host byte transfer
rate, and select the burst length accordingly.
For a b'etter throughput the recommended values are:
1. With buffered devices on the byte channel: 64 with CADS and
254 with BCCA.
2. Without buffered devices on the byte channel:
308X or 309X: 32
- 4381 or 4341: 16
- 4361: 8
Note: Value 254 may be used on a oyte multiplexer channel if the
user wants to optimize the efficiency (connect time) instead of the
throughput on the byte multiplexer channel.
CHANNEL PRIORITY
L (low) or H (high). Priority to be given to the CA among the other
units attached to the channel.
NSC ADDRESS
Address of the native subchannel for the NCP or PEP. Enter a
hexadecimal number between 00 and FF.
ESC ADDRESS RANGE
9-26
3745 Service Functions
Address range of the emulation subchannel for the PEP when the
emulation subchannel is used. (These ESC low and high addresses
must be left blank for a channel adapter in TPS mode.)
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