HP 2424M - Manual (Page 20)

HP ProCurve Switch 4000M / 8000M / 2424M / 1600M Reviewer’s Guide
• HP ProCurve Gigabit-LX Transceiver
• HP ProCurve Gigabit-Stacking Kit (allows a low cost Gigabit stacking connection between
two HP ProCurve Switch 2424Ms). Includes two transceivers and a .5m cable.
Note: The Gigabit Stacking Module only works in the HP ProCurve Switch 2424M. It cannot be used
in the HP ProCurve Switch 8000M / 4000M / 1600M.
A fully loaded HP ProCurve Switch 4000M or 8000M can have eighty 10/100Mbps ports available in a
box only 17.8cm (7") in height.
The HP ProCurve Switch 2424M provides twenty-four 10/100Mbps fixed UTP ports and has one module
slot that accepts any of the modules listed above, including the Gigabit Stacking Module. It is 6.6cm
(2.6") in height.
The HP ProCurve Switch 1600M provides sixteen 10/100Mbps fixed UTP ports and has one module slot
that accepts any of the modules listed above. It is 6.6cm (2.6") in height.
2.14 Reliability
Overall reliability of a product is determined not only by how much time between product failures, but
also how fast a failed unit can be repaired or replaced. HP, through the design of the HP ProCurve
Switch 8000M and 1600M, and the lifetime (for as long as you own the product) warranty, has raised
overall reliability to an industry-leading level. Details are provided in the following section.
2.14.1 Availability
Availability is the measure of the ability for the switch to remain running over a period of time with
minimal impact to the network environment.
For the HP ProCurve Switch 4000M/8000M/2424M/1600M hot-swapping of the port modules can be
done while the switch is still running without affecting the other port modules. This allows a defective
port module to be replaced without affecting the rest of the network. When the replacement port
module is swapped-in the HP ProCurve Switch 4000M/8000M/2424M/1600M runs the module through a
self-test sequence that verifies the module is good.
An optional second power supply (identical to the primary supply) can be installed in either the
HP ProCurve Switch 4000M or 8000M with both power supplies load-sharing, allowing both supplies to
run cooler and extending both of their Mean Time Between Failure (MTBF) values. If one of the
supplies does fail, the other one takes over without switch interruption. Either power supply can be
hot-swapped during switch operation when both supplies are present. Each supply has its own power
cord.
The HP ProCurve Switch 4000M/8000M/2424M/1600M supports Switch Meshing, Cisco Fast
EtherChannel and HP port trunking which, in addition to increased bandwidth, provides for
redundancy for switch-to-switch connections.
2.14.1.1 MTBF
The estimated Mean Time Before Failure (MTBF) of the HP ProCurve Switch 4000M or 8000M fully
loaded with ten J4111A 10/100 Base-T modules (80 ports) is over 28,000 hours. It is the same for 72
10/100 ports and one gigabit port.
The estimated MTBF for the HP ProCurve Switch 2424M is 63,400 hours.
The estimated MTBF for the HP ProCurve Switch 1600M with one gigabit port is 53,300 hours.
2.14.2 Lifetime Warranty (Best in the Industry)
Warranties, and the ease of obtaining warranty service for the end user, is a product benefit that is
easily overlooked in a technical evaluation, but ranks high as a concern of end users as they get ready
to actually make a purchase decision. In order to maximize net uptime, all HP switches have a lifetime
warranty for as long as you own the product. If any part of the switch fails, including the power supply
©1998, 1999, 2000 Hewlett-Packard Co Revision 3.2b – 1/15/2000 Page 20 of 36