Configuring Communication Lines On The 3746-900 (Line Weights; Assumed Line Utilization (Duplex); Assumed Traffic Mix - IBM 3745 Connection And Integration Manual
Communication controller, nways multiprotocol controller
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- Hardware maintenance reference (712 pages) ,
- Maintenance information reference (595 pages) ,
- Problem determination manual (387 pages)
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Configuring Communication Lines on the 3746-900 (Line Weights)
The CLPs perform the data link control and traffic routing for the lines connected to
the 3746-900. In the 3746-900, the CLPs also perform the data link control for the
lines activated by the NCP. The contribution of an individual line to the CLP load
depends on the:
CF3745 Hardware Configurator (Standard Line Weights)
Standard Line Weight Assumptions
The 3746 hardware configurator (CF3745) assigns lines to the CLPs by using
standard line weights. For a given speed, this line weight represents the line
contribution to the CLP load for a typical line utilization (%) and mix of traffic. The
CF3745 assigns the lines to the CLPs without exceeding 90% of CLP load under
the assumptions of the standard line weights.
For a given transmission speed, Table B-5 on page B-5 shows the standard line
weights. The corresponding standard CLP connectivity is shown in Table B-6 on
B-4
3745 All Models & 3746-900: CIG
Traffic type: IP, HPR/ANR, HPR/RTP, APPN/DLUR, or NCP
Line speed
Line protocol (Frame-relay, SDLC, X.25, PPP)
Type of mode: duplex or half-duplex
Percentage of line utilization, including messages sent by users and
applications, control information (such as acknowledgements, status frames
(ANR), and so on). Line utilization is mainly influenced by the size and rate of
data messages exchanged between users and applications.
Table B-3. Assumed Line Utilization (Duplex)
Line Speed Range
Up to 4.8Kbps
Up to 28.8Kbps
Up to 64Kbps
Up to 256Kbps
Up to 2.048Mbps
Note: Line utilization includes user data, control traffic, header/trailer, and so on.
Table B-4. Assumed Traffic Mix
Traffic Type
Transaction Processing
Interactive (3270-like)
Batch/File Transfer/Image
Batch/File Transfer/Image
Note: For each direction, in or out of the 3746, size of the data message created by
the sending workstation or application (0 means that the data traffic is in a single
direction, in or out).
Line Utilization (see note)
40%
45%
50%
45%
40%
Transaction Size:
Bytes (see note)
128/128
40/1000
0/2000
0/4000
Percentage of
Transactions
20%
50%
15%
15%
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