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active and passive monitoring applications. Passive
monitoring uses a dedicated tap in conjunction with
a compatible monitoring card. Active monitoring
uses a network card that provides at least two network
interfaces, with software that forwards traffic
from one interface to the other, and pass-through
support to maintain network continuity when the
monitoring station is powered down.
Active Monitor Cards
Active monitor cards are connected
directly in-line with the data circuit. While the monitoring
station is on-line, network traffic must be forwarded
from one side of the monitor point to the other using
software that is written for this purpose. This type
of active monitoring solution is required when the application
must modify the traffic before it is forwarded.
ImageStream offers the active monitor cards listed below.
With the appropriate volume, ImageStream can modify
standard network cards to provide automatic pass-through
during power loss. In addition, ImageStream offers a
number of off-the-shelf network cards that may be used
in active monitoring applications without support for
the automatic pass-through feature.
10/100 Ethernet Monitor Card
ImageStream's active 10/100 ethernet monitor card is
a two-port 32/64-bit PCI card that supports automatic
pass-through with loss of power.
HSSI Monitor Card
ImageStream's active HSSI monitor card is a two-port
32-bit PCI card that supports automatic pass-through
with loss of power.
Passive Monitor Cards
Passive monitor cards are used in
conjunction with a monitor tap that maintains network
continuity when the monitor card is disconnected from
the tap. Passive monitoring systems like this support
packet forwarding across the tap without any special
software. In contrast with active monitoring systems,
passive systems cannot be used to modify the data as
it passes across the monitor point.
Ethernet Monitor Cards
ImageStream's passive ethernet cards are designed to
work with different ethernet taps including the 10/100
UTP ethernet and the gigabit ethernet fiber tap.
Synchronous Serial Monitor Card
ImageStream's passive synchronous serial monitor card
is designed to work with ImageStream's synchronous serial
tap to monitor V.35, RS232, and RS422 (EIA530, RS449,
or X.21) serial interfaces.
T1 and E1 Monitor Cards
ImageStream's passive T1 and E1 monitor cards are designed
to work with ImageStream's T1/E1 tap to monitor T1 or
HSSI Monitor Cards
ImageStream offers two different passive HSSI monitor
cards including a low-cost card and a co-processed card.
Both cards are designed to work with ImageStream's HSSI
tap to monitor HSSI interfaces running at speeds up
to 52 Mbps.
DS3 and E3 Monitor Cards
ImageStream offers DS3 and E3 monitor cards, with or
without an onboard co-processor. These
cards are designed to work with ImageStream's DS3 or
E3 taps to monitor DS3 or E3 interfaces.
ATM OC3 Monitor Card
ImageStream offers a passive ATM OC3 monitor card that
is designed to work with ImageStream's OC3 tap.