Redundancy Of Fusion Link; Figure 3-3 Add A Direct Connection To Fusion System With Fch - NEC NEAX 2400 IPX Manual

Note: When a direct connection is added to the existing Fusion system with FCH card between the two nodes, it
is required to execute Make Busy operation (MB Key ON/OFF) on the FCH cards to prevent from packet
loop.
DTI
DTI : Digital Trunk Interface

Figure 3-3 Add a Direct Connection to Fusion System with FCH

On other occasions for adding direct connection (connect cross cable between the HUBs) to the Fusion
network consists of multiple nodes, also perform the MB key ON/OFF operation on just a single FCH card
to prevent from packet loop. See
When the system applies dual configuration, MB Key ON/OFF operation is to be executed to an FCH card
on each #A/#B side.

2.2 Redundancy of FUSION Link

FCH (PA-FCHA) card handles a Fusion link, occupying one time slot of a frame by D/I function equipped on
the DTI card. In terms of redundancy, Fusion system (with FCH) can have one of the following configurations.
• Redundant Configuration (LANI, HUB, FCH, and DTI)
• Redundant Configuration (HUB, FCH, and DTI)
• Redundant Configuration (FCH and DTI)
• Non Redundant Configuration
Node A
DTI
Fusion Link
1.5M
FCH
MB key ON/OFF
HUB
CPU
LANI
10BASE-T
Connect the HUBs with a cross cable
FCH : Fusion Call Control Handler
Figure 3-3
Node B
DTI
FCH
HUB
CPU
LANI
NDA-24299
SYSTEM CONFIGURATION
Fusion System with FCH
DTI
LANI : LAN Interface
CHAPTER 3
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