Mitel 3300 ICP Technician's Handbook page 90

3300 ICP Technician's Handbook – Release 3.2
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64 Channels of Echo Cancellation
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Two External FIM connections
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Four ASU connections (integral to unit)
The two external FIM connections are for providing connectivity for
up to two Peripheral Units or up to four NSUs. Note that there are
two T1/E1 links per NSU.
To add 32 compression channels to a 250 user system (Release
3.0/3.1 chassis):
1. Remove the cover.
2. Install the additional Quad DSP Module (slot MMC3).
3. Replace the cover.
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