A combination of a zero-length test load and the transmitter compliance transfer function (TCTF) test load methodology is used for the specification of transmitter characteristics. This methodology specifies the trans- mitter signal at the test points on the required test loads. The transmitter uses the same settings (e.g., pre- emphasis, voltage swing) with both the zero-length test load and the TCTF test load. The signal specifications at IR are met under each of these loading conditions.

The TCTF is the mathematical statement of the transfer function through which the transmitter shall be capable of producing acceptable signals as defined by a receive mask. The transmission magnitude response of the TCTF in dB is given by the following equation for 1.5 Gbps:

21

= –20⋅ log10(e) ⋅ ((6, 5 ⋅ 10–6⋅ f0, 5 ) + (2, 0 ⋅ 10–10⋅ f) + (3, 3 ⋅ 10–20⋅ f2)) dB

for 50 MHz < f < 1.5 GHz, and:

S21

= –5,437dB

for 1.5 GHz < f < 5.0 GHz,

where:

a) f is the signal frequency in hertz.

The transmission magnitude response of the TCTF in dB is given by the following equation for 3.0 Gbps:

S21

= –20⋅ log10(e) ⋅ ((6, 5 ⋅ 10–6⋅ f0, 5 ) + (2, 0 ⋅ 10–10⋅ f) + (3, 3 ⋅ 10–20⋅ f2 )) dB

for 50 MHz < f < 3.0 GHz, and:

S21

= –10,884dB

for 3.0 GHz < f < 5.0 GHz,

where:

a) f is the signal frequency in hertz.

The TCTF is used to specify the requirements on transmitters that may or may not incorporate pre-emphasis or other forms of compensation. A compliance interconnect is any physical interconnect with loss equal to or greater than that of the TCTF at the above frequencies that also meets the ISI loss requirements shown in fig- ure 20 and figure 21.

Compliance with the TCTF test load requirement is verified by measuring the signal produced by the transmit- ter through a physical compliance interconnect attached to the transmitter.

Compliance with the zero-length test load requirement verified by measurement made across a load equiva- lent to the zero-length load shown in figure 19.

For both test load cases, the transmitter delivers the output voltages and timing listed in table 28 at the desig- nated compliance points. The default mask is IR for intra-cabinet TxRx connections. The eye masks are shown in 9.5.2.1.

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Savvio 10K.2 SAS Product Manual, Rev. B

Page 77 Page 79
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Seagate ST973402SS, ST9146802SS manual = -5,437dB
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ST973402SS, ST9146802SS specifications

The Seagate ST973402SS and ST9146802SS are high-performance, enterprise-grade hard drives designed to meet the demanding needs of data-intensive applications. These drives are part of Seagate's Savvio and Barracuda product lines, aimed specifically at businesses and institutions requiring reliability, speed, and efficiency in storage solutions.

The ST973402SS is a 73GB, 2.5-inch hard drive, while the ST9146802SS offers a larger capacity of 146GB. Both models utilize a 10,000 RPM spindle speed, which significantly enhances their ability to handle fast data read and write operations. This speed ensures reduced latency and improved overall performance, making them ideal for environments where rapid access to data is crucial.

One of the standout features of these drives is their support for Serial Attached SCSI (SAS) interface. SAS technology provides a point-to-point connection, which allows for increased data transfer rates compared to traditional SATA drives. The ST973402SS and ST9146802SS are capable of transferring data at speeds of up to 600 MB/s, facilitating efficient data transfers in enterprise systems.

In terms of reliability, both models offer advanced features designed to improve data integrity and durability. They are built to withstand high workloads, with an annualized workload rate of up to 550 TB per year. This makes them well-suited for applications like databases and transactional storage, where sustained performance is required. Additionally, the drives feature Seagate’s PowerFit technology, which optimizes performance while minimizing power consumption.

To enhance data security, the drives come equipped with self-encrypting technology, ensuring that sensitive data is protected through hardware-based encryption. This is particularly important in environments where data breaches can lead to significant operational impacts.

The drives are also designed to operate efficiently in terms of thermal management, featuring robust heat dissipation capabilities. This helps to maintain optimal performance levels while prolonging the lifespan of the drives.

Overall, the Seagate ST973402SS and ST9146802SS are robust and reliable hard drives that cater to the needs of enterprise environments, combining high capacity, exceptional speed, advanced security features, and energy efficiency to help businesses maintain and manage large volumes of data effectively. With their proven performance and innovative technologies, these drives are well-equipped to support a wide range of applications in modern data centers.
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