content_image/996803.jpg
<img src='content_image/996803.jpg'>

a. Minimum fiber bandwidths in MHz/km for multimode fiber optic links are included in parentheses, where applicable. 

b. 2 and 4 Gbps connectivity is not supported for point-to-point connections 

c. 2 and 4 Gbps connectivity is supported through a switch with 8 or 16 Gb optics. 

## zHyperLink Express1.1 (FC 0451) 

zHyperLink is a new technology that provides up to 5x reduction in I/O latency times for Db2 read requests with the qualities of service IBM Z clients expect from I/O infrastructure for Db2 v12 with z/OS. The z/OS supported versions for Reads are: 

GLYPH<SM590000> z/OS V2.4 

GLYPH<SM590000> z/OS V2.3 with PTFs 

GLYPH<SM590000> z/OS V2.2 with PTFs 

GLYPH<SM590000> z/OS V2.1 with PTFs 

The z/OS supported versions for Writes support are: 

GLYPH<SM590000> z/OS V2.4 

GLYPH<SM590000> z/OS V2.3 with PTFs 

GLYPH<SM590000> z/OS V2.2 with PTFs 

The zHyperLink Express1.1 feature (FC 0451) provides a low latency direct connection between z15 and DS8k storage system. 

The zHyperLink Express1.1 is the result of new business requirements that demand fast and consistent application response times. It dramatically reduces latency by interconnecting the z15 directly to I/O Bay of the DS8k by using PCIe Gen3 x 8 physical link (up to 150-meter [492-foot] distance). A new transport protocol is defined for reading and writing IBM CKD data records$^{7}$, as documented in the zHyperLink interface specification. 

On z15, zHyperLink Express1.1 card is a new PCIe Gen3 adapter, which installed in the PCIe+ I/O drawer. HCD definition support was added for new PCIe function type with PORT attributes. 

## Requirements of zHyperLink Express1.1 

The zHyperLink Express feature is available on z15 servers, and includes the following requirements: 

GLYPH<SM590000> z/OS 2.1 or later 

GLYPH<SM590000> 150 m maximum distance in a point-to-point configuration 

