The leading and trailing edge slopes of figure 20 shall be preserved. As a result the amplitude value of Z1 is

less than that given in table 20 and Z1TOL and Z1OP shall be defined from those slopes by the following equa-

tion:

 

X2OP – ((0, 5)xadditional sinusoidal jitter) – X1OP

Z1TOL

= Z1OPx

----------------------------------------------------------------------------------------------------------------------------------X2OP– X1OP

where:

 

 

 

Z1TOL is the value for Z1 to be used for the tolerance masks; and

Z1OP, X1OP, and X2OP are the values in table 20 for Z1, X1, and X2.

The X1 points in the receive tolerance masks are greater than the X1 points in the receive masks, due to the addition of sinusoidal jitter.

Figure 22 defines the sinusoidal jitter mask.

Peak-to-

peak

Sinusoidal jitter frequency

sinusoidal

(log/log plot)

jitter

(in UI)

FNOM = 1.5 x 10 9 for 1.5 Gbps

 

1.5

F

NOM

= 3.0 x 10 9 for 3.0 Gbps

 

 

1.0

 

 

 

0.1

 

 

 

0

FNOM / 25,000

FNOM / 1,667

 

Frequency (in kHz)

Figure 22. Sinusoidal jitter mask

64

Cheetah T10 SAS Product Manual, Rev. A

Page 69 Page 71
Page 70
Image 70
Seagate ST3300555SS, ST3146755SS, ST373355SS manual Peak-to, Sinusoidal, Jitter, Frequency in kHz
Page 69 Page 71

ST3300555SS, ST3146755SS, ST373355SS specifications

The Seagate ST373355SS, ST3146755SS, and ST3300555SS represent a range of high-performance hard drives designed for enterprise applications, particularly in server environments requiring reliability, speed, and high capacity.

The ST373355SS is a 73.5 GB SCSI hard drive operating at 15,000 RPM, which ensures rapid data access and superior performance, making it ideal for transactional applications and data-intensive tasks. With its 4 MB cache, the drive leverages fast read and write speeds, enhancing overall system responsiveness. The SCSI interface, operating at 80 MB/s, allows for high-speed data transfers, making it a suitable choice for demanding environments where quick access to information is critical. Its hot-swappable feature enables maintenance without shutting down the system, maximizing uptime and productivity.

The ST3146755SS, with a capacity of 146.8 GB, builds on the performance of its predecessor while introducing improvements in data handling and reliability. Operating at the same impressive 15,000 RPM, this model also features a 16 MB cache that greatly improves data throughput and access speed. The drive is designed to reduce latency, which is crucial for applications where timing is everything. It is equipped with advanced error recovery features and Seagate’s innovative PowerTrim technology, which improves power efficiency during read and write operations. The ST3146755SS also features a higher mean time between failures (MTBF), underscoring its reliability in high-demand environments.

Lastly, the ST3300555SS offers even greater capacity with 300 GB. This drive maintains the 15,000 RPM rotation speed and benefits from a 16 MB cache, providing a balance of speed and storage capacity. Its advanced SCSI interface supports not just speed but also data integrity, ensuring consistent performance during extensive data transfers. The drive is designed to handle workloads naturally associated with enterprise servers, data warehouses, and video editing applications. Its rugged build supports continuous operation and is tested for high-temperature environments to ensure durability.

In summary, the Seagate ST373355SS, ST3146755SS, and ST3300555SS hard drives are engineered for enterprise environments, combining impressive RPM speeds, significant storage capacities, and advanced technologies to deliver reliability, performance, and efficiency for critical applications. These hard drives represent Seagate's commitment to providing solutions that meet the rigorous demands of modern data environments.
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