NX-Platform Hardware Installation and Safety 31
between equipment A and B is 100 meters, then the cable length between equipment A and BIOM-1A plus
equipment B and BIOM-1B cannot exceed 100 meters.
Warning!
BIOMs use internal mechanical switches that are highly sensitive. Use care when removing
the module from the IPS while the network is still connected to the segment ports. Rough
or reckless handling of the BIOM could cause the mechanical switches to break connection,
which could result in temporary loss of network connectivity.
Link transitions
Describes how link transitions occur.
When transitioning into or out of bypass mode, a link transition can result. During a link transition, the link
goes down briefly and then comes back up. Even though the transition of the bypass happens quickly, some
network equipment can take longer to establish a link. To recognize normal patterns for your IPS, take note
of the link times required by your network equipment that connects to the bypass module.
Optical insertion loss
Describes how optical insertion loss for BIOM link occurs.
Insertion loss for optical BIOMs is higher than for standard I/O modules. This normal drop in signal power
occurs because of the presence of optical switches and the two duplex connections on the module’s front
panel. Unlike standard I/O modules, insertion loss for a BIOM link happens twice—once when the signal
enters the module’s duplex connection and once when it exits the connection.
In addition to the duplex adapter loss, the BIOM experiences a drop in signal power between the optical
switch and the duplex adaptor as well as between the switch and the SFP+ transceiver. This loss also
happens twice—when the signal enters the module and when it exits the module.
The maximum connection lengths to other equipment is limited by the insertion loss during bypass mode.
The combined external connection lengths on a bypass port pair must be less than the allowed maximum
length for a normal connection adjusted for the bypass module insertion loss.
The following table provides estimates of both nominal and worst-case bypass module optical insertion loss.
Note these limitations when configuring your network connections.
SR
multimode
LR
multimode
Nominal Worst case Nominal Worst case
Each duplex adapter 0.1dB 0.35dB 0.1dB 0.30dB
Each internal fibre 0dB 0.15dB 0dB 0.15dB
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