IBM i series Handbook page 300

Towers and Racks
– 6m, 30m, 100m 250m optical HSL cables
– Migration tower attachment supports SPD I/O towers and #5065/#5066 Storage/PCI
Expansion Towers
• Homogeneous HSL network with V5R1 HSL adapters
– Simple HSL Clusters (two iSeries)
– xSeries for iSeries HSL connectivity
– Switchable HSL connected tower with IASP
In system complexes that contain only V5R1 HSL hardware, the HSL implementation consists
of loops that may contain any expansions (#5074/#5075/#5078/#5079s) and two iSeries
servers. These HSL loops provide redundancy to all attached towers. In addition, the
implementation of HSL and OS/400 provide data flow balancing across the loop by assigning
communication paths during an IPL to optimize loop throughput based upon loop and tower
configurations.
The connectivity of loops is shown in the following figure.
Note: The iSeries Model
270 does not support the
15m HSL cable. The Model
820 has limitations on
which segments of the HSL
loop can be 15m.
In system complexes that
contain only V5R1 HSL,
implementation consists of
loops that can contain any
expansions (#5074, #5075,
#5078, and #5079) and two
iSeries servers.
For further details, see the
product sections within this
Handbook or AS/400e to iSeries 400 Migration , SG24-6055.
The base rules for tower placement can be found in the iSeries and AS/400e System Builder,
SG24-2155. HSL rules and migration considerations are described in the redbook AS/400e to
iSeries Migration , SG24-6055.
HSL cables supported in each iSeries server are identified in the following table.
270
iSeries Handbook
V5R1 Connectivity
New Server
Model
PCI Expansion
Tower
Switchable
Tower (IASP)
Copper HSL Cables
3, 6 and 15 meter
New Server
HSL Loop
xSeries for
iSeries
Model