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and iPasolink indoor units. NHG2 upgrade to level 5.08 from lower level than 4.90.0 is a two-step upgrade:
to level 4.90.0 first and then to level 5.08 or later.
IHG
IHG FW version should be 5.08 or later. IHG will then work with iPasolink and PASOLINK NEO.
BLOCK DIAGRAMS
The block diagram of iPasolink 400 Indoor Unit (IDU) is presented in Figure 3. The Outdoor Unit (ODU) is
described in Figure 4.
The IDU main card has a separate TDM switch and a packet network L2 switch. It supports natively both
circuit-switched TDM as well as packet-switched Ethernet transport modes. In addition the equipment
supports the "TDM-over-Ethernet" mode when equipped with the PWE option.
The modulator part of the modem generates an intermediate frequency signal. It is modulated by the
digital baseband signals and sent up to the ODU. The demodulator part demodulates the intermediate
frequency signal coming down from the ODU.
The demodulator includes an adaptive equalizer which repairs the linear distortions (poor amplitude and
phase response of the channel) caused by multipath fading. It also includes a FEC (Forward Error Correction
code) which is able to correct bit errors even very close to the threshold receive level. The system is almost
error-free until very close to the threshold and the transition to outage is within a couple of dB.
It is possible to equip the iPasolink 400 and 1000 IDUs with two redundant power supplies. Interruption of
one -48V supply voltage or a fault in one power supply unit will not cause any traffic interruption. Note:
iPasolink 100/200 has two independent connections to external -48V voltage but does not contain a
redundant power supply unit.
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