Features; Equipment Supplied - HP 27115A Installation Manual

Features
Disk clusters and
I/O slot efficiency
Transfer rates
Omoading the host
CPU
Optical fiber cable
Table 1-1 summarizes key features of this product.
Table 1-1. Summary of HP 27115A Features
HP-FL can connect the host with up to 8 disk drives in a cluster. This can result in a large
number of disk drives attached to your system while lowering the number of I/O slots
required. The drives use a "daisy-chain" connection called the "PBus" to move data to the
fiber link.
The HP-FL protocol can transfer up to 5 Mbytes per second. The overhead imposed by the
HP-FL device adapter is less than 1 ms. (Additional overhead accrues from the software,
the channel, and the disk controller.)
The HP-FL on-board microprocessor controls the HP-FL protocol. It manages PCA
operations and data transfers with minimal host intervention. It also conducts a hardware
self-test, and displays results of internal and external link status checks by means of 6 LEOs.
Fiber-optic cable is thin, lightweight and flexible. It is not susceptible to electronic or
magnetic noise and provides electrical isolation The cable may be up to 500 meters long,
allowing greater flexibility in locating disk drives. (See "Cables, Test Equipment, and
Tools", to order a cable other than 30 m long.)
Equipment Supplied
The following items are provided with the standard HP 27115A product:
• 27115-60001 HP-FL device adapter PCA
• 1005-0078 30 m, duplex fiber-optic cable with
90s-type
SMA connectors
• 5061-3151 PBus terminator (quantity
=
2)
• 27115-90001 HP 27115A Fiber-Optic Link Installation Manual
Figure 1-2. HP 27115A Fiber Optic Link
1-2 Generallnformation