Sun Microsystems Netra T4 AC100, Service And System Reference Manual

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10-32 Netra T4 AC100/DC100 Service and System Reference Manual • August 2001
10.2.13.2 External Cables
The RJ45 Ethernet port supports a Category 5, STP cable for the 100BASE-T, and a
Category 3, 4, or 5 STP cable for the 10BASE-T operation.
Note – The maximum cable segment lengths for the 100BASE-TX and
10BASE-TX are 100 m (328 ft) and 1000 m (3282 ft), respectively.
10.2.14 FC-AL Subsystem
The Netra T4 system supports FC-AL (Fibre Channel-Arbitrated Loop) as the
interface for internal and external hard drives. The physical medium is copper.
Optical links are not supported.
The disk drives are connected to the loop through a hub chip. The hub supports two
internal connectors and the external connector. Internal signal detect circuitry
automatically detects the presence of a device at the external connector that enables
or disables the external port. The individual ports can also be bypassed manually by
a software probe and programming a GPIO register in the FC-AL controller.
The FC-AL host controller ASIC has a 64-bit, 66 MHz PCI (EPCI) interface. The
controller contains the serializer/deserializer (SERDES) and the transceivers on-chip.
The host controller implements the Fiber Channel protocol through a microcoded
engine. The memory for the firmware is external and is implemented with
synchronous 128 kByte SRAM. This memory also keeps the context data for
outstanding I/Os.
The figure below shows the Netra T4 disk subsystem architecture:
TABLE 10-4
ISP2200A GPIO Bits
ISP2200A GPIO Bits Drive Control Input/Output Type Default/Reset Value
<0> External drive Output 1*
<1> Internal drive 1 Output 1*
<2> Internal drive 2 Output 1*
<3> External port detect Input 0**
**0 means bypass
*1 means enable