Product category:
Communications ICs (Wired)
News Release from: Avago Technologies | Subject: HDMP-0528 PBC
Edited by the Electronicstalk Editorial
Team on 20 November 2003
Bypass circuit speeds storage subsystems
A new eight-port bypass circuit features redundant links, diagnostics, and isolation and signal clean-up capabilities for JBOD, RAID or Fibre Channel storage subsystems.
A new eight-port bypass circuit (PBC) device provides 1 or 2Gbit/s operation and features redundant links, diagnostics, and isolation and signal clean-up capabilities for high-speed serial Fibre Channel arbitrated loop signals within JBOD (just a bunch of disks), RAID (redundant array of inexpensive drives) or Fibre Channel storage subsystems The most basic function of the port bypass circuit is to permit individual disk drives to be added to or taken out of the array and "hot swapped" without affecting the operation of the remaining drives or of the overall data storage subsystem
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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By adding intelligent functions to the port bypass circuit hardware, the Agilent HDMP-0528 PBC offers an economical way to reduce system downtime and costs, and to improve the performance of the mass storage subsystem.
Four of the Agilent HDMP-0528 PBC's eight ports incorporate integrated clock and data recovery (CDR).
Each CDR can be configured to work in buffer mode, repeater mode or retimer mode.
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In buffer mode, the signal bypasses the CDR and is sent directly to the output port.
In repeater mode, data are retransmitted using the recovered clock, attenuating jitter while adding minimal latency.
In retimer mode, the incoming data are retimed using a local reference clock, ensuring no jitter is transferred to the retransmitted signal.
The advanced port diagnostic features of the Agilent HDMP-0528 allow systems to independently monitor each of the CDR ports.
Multiple HDMP-0528 PBCs may be cascaded or connected to other Agilent PBC devices to create loops for a virtually unlimited number of disk drives.
The Agilent HDMP-0528 also incorporates an integrated advanced threshold detect/auto bypass (TDAB) function.
With the TDAB function the Agilent PBC offers the capability of monitoring errors and signal behaviour and may be programmed to provide the system with valuable diagnostic data indicating the quality and state of the link.
If desired, the TDAB function can be programmed to bypass problematic links automatically without requiring system intervention.
In addition, the Agilent HDMP-0528 provides signal-loss equalisation at each CDR input port to correct distortion from the received signal.
The device provides user-selectable 100 or 150ohm impedance on both the input and output ports from pin control or via a two-wire interface.
In addition, the two-wire interface allows control and diagnostic capabilities for enhanced operation.
The Agilent HDMP-0528 is supplied in a compact 289-ball 19 x 19mm TEPBGA-II (thermally enhanced plastic ball grid array) with 2kV HBM (human body model) ESD protection to minimise damage during handling and operation from -10 to +85C (case temperature).
The Agilent HDMP-0528 PBC is available in samples to select customers through Agilent's direct sales channel. Request a free brochure from Avago Technologies ...
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