NEC Neax 2400 Ipx Installation Manual

NDA-24306 CHAPTER 2
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Because the Fusion link can be established either independently within the system (IPX-U) or jointly with other
outside IPX and/or IMX series, the assignment of NCN can differ, depending on the network configuration.
Figure 2-20   Example of NCN Assignment (1/3) Note 1:The network-level data (NDM data) can be assigned only at the NCN. However, other node-level data (LDM data)
must also be assigned at each node (including ISW), depending on the...

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Figure 2-20  Example of NCN Assignment (2/3)
Note 1:The network-level data (NDM data) can be assigned only at the NCN. However, other node-level data (LDM
data) must also be assigned at each node (including ISW), depending on the requirements. For more details,
 refer t o NAP-200-020 in Chapter 4 or the “Fusion Network System Manual.” 
Note 2:When the system is operated, the function to be performed by the ISW is only to provide the PCM time...

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Figure 2-20  Example of NCN Assignment (3/3)
Note 1:The network-level data (NDM data) can be assigned only at the NCN. However, other node-level data (LDM data)
must also be assigned at each node (including ISW), depending on the requirements. For more details, refer to NAP-
200-020 in Chapter 4 or the “Fusion Network System Manual.” 
Note 2:When the system is operated, the function to be performed by the ISW is only to provide the PCM time...

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9.4 Preparation of Trunking Diagram
Prepare the trunking diagram according to the customer’s specifications. Since there are different kinds of
switching offices such as a single office, network offices, etc. are involved, the trunking diagram must be
prepared as per the customer’s specifications.
9.5 Preparation of Module Group Face Layout and Port Accommodation Diagram
When mounting of various circuit cards in the PBX have been finalized,...

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10.1 AC Input, DC Power, and Ground Cables
1. For AC input cable, VCT (Polyvinyl Chloride Cabtyre Cable) should be used. However, if shielding is
necessary, as is the case when the AC input cable is to be installed in parallel with a low-voltage power
cable, etc., be sure to use VCT-S (Shielded Polyvinyl Chloride Cabtyre Cable).
2. For the power receiving terminals of the PBX, -48 V and G terminals are provided in dual (A side and B
side). For...

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Figure 2-21   DC Main Power Cable and Main Ground Cable
Note 1:Do not make a multiple connection across “A” terminal and “B” terminal of -48V.
Likewise, do not make a multiple connection across “A” terminal and “B” terminal of GND.
Note 2:It is recommended that each -48 V lead from the PBX be connected to a separate circuit breaker at the rectifier.
MDFMAT
 GROUND
TERMINAL Earth Bar BATTERY
AC POWER
DISTRIBUTION
BOARD
RECTIFIER
-48V
G
-48V
G...

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Table 2-10  Clamp Terminal Shape and Purpose
TYPE SHAPE PURPOSE REMARKS
AEnd terminal
TBranching or extension of power 
cable 

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Note:Selection of T-Type Clamp Terminal
The asterisk (*) in Table 2-11 indicates that an auxiliary conductor is needed when using a main power wire and a
branch power wire of a thinner diameter, and the clamp terminal of the type indicated in the selected columns.Table 2-11  Selection of T-Type Clamp Terminal
BRANCH
 MAIN14 AWG/ 
2 mm
2
12 AWG/ 
3.5 mm
2
10 AWG/ 
5.5 mm
2
8 AWG/ 
8 mm
2
6 AWG/ 
14 mm
2CURRENT REMARKS
10 AWG *T-20 *T-20 *T-20...

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Figure 2-22   Calculation Method for Sectional Area
BATTERY
RECTIFIERPBX
IV1M1 I2M2
S=
0.018x(I1M1+I2M2)
V
where,
S  
I1
M1
I2
M2
V:  Sectional area required (mm
2) 
:  Maximum current passing between battery and rectifier
:  Two-way cable length between battery and rectifier
:  Maximum current passing between rectifier and PBX
:  Two-way cable length between rectifier and PBX
:  Voltage drop
  

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10.2 Cables between the PBX and MDF
With respect to lines, trunks, and NCU (PFT), 25P shielded the PBX and the MDF are connected using cables
with a CHAMP (Amphenol) connector at one end.
Table 2-13 shows the procedure for calculating the required number of cables. Figure 2-23 also shows an outline
of cable connections from the Module Group to the outside.
Table 2-13  Calculating the Number of Cables
CABLE NAME CALCULATION SUB TOTAL
LT Cable...