NEC Neax2000 Ivs Isdn System Manual

ND-45857 (E) CHAPTER 2
Addendum-001 Page 13
AUGUST, 1998 Revision 3.1
SYSTEM DESCRIPTION
3.2 System Conditions
3.2.1 Time Slot Assignment Condition
As shown in Figure 2-8, the DTI/DCH/ICH/BRI cards use the time slots on the same highway as the other ap-
plication cards. 
However, the following conditions are required on the time slot assignment.
• The total number of time slots for all DTI/DCH/ICH/BRI cards must be less than 128 time slots including
all other AP cards.
• The total number of time slots...

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3.2.2 Time Slot Allocation for DTI/DCH Card
On each DTI card, the system recognizes the lowest and highest channel numbers to which Trunk Numbers have
been assigned, and allocates time slots to all the channels within them. If Trunk Numbers are assigned to dis-
continuous channels in this case, the system also allocates time slots to channels not assigned.
For example, as shown in Figure 2-9, even when Channel 1 through Channel 10 have been...

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SYSTEM DESCRIPTION
3.2.3 Line Distance between PBX and CSU/ISDN Terminal
Figure 2-10 shows the line distance between PBX and CSU and the line distance between PBX and ISDN Ter-
minal.
Figure 2-10   Line Distance between PBX and CSU/ISDN Terminal
Note 1:The line distance marked by * shows the value when the 0.5ø (24 AWG) twisted-pair cable is used.
Note 2:The line distance marked by ** shows the value when the 0.65ø (22 AWG)...

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3.2.4 Service Conditions for Event Based CCIS
• Event Based CCIS is available in 2000 IVS to 2000 IVS or 2000 IVS to 2400 ICS.
• The maximum number of the virtual tie lines is 16 channels per one system, including both common
signaling channels and voice channels.
• The ISDN line used for the virtual tie line can also be used as a regular ISDN line.
The trunk route used for the virtual tie line can be distinguished from the regular ISDN...

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SYSTEM DESCRIPTION
3.3 DTI Specifications
3.3.1 Transmission Characteristics
* AMI : Alternate Mark Inversion
ZCS : Zero Code Suppression
B8ZS : Bipolar Eight Zero Substitution
Table 2-4  Transmission Characteristics
CHARACTERISTICS SPECIFICATION
(1) Output
• Line Rate  1.544 Mbps ±50 ppm
• Line Code AMI with ZCS/B8ZS*
• Line Impedance 100 ohms
• Pulse Amplitude (Base to Peak) 3 volts ± 0.6 volts
• Pulse Width 324 ns ± 30 ns
(2)Input
• Line Rate 1.544 Mbps ±...

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SYSTEM DESCRIPTION
3.3.2 Frame Configuration of 24-DTI
According to the AT&T Specifications for ISDN, the frame configuration is 24-Multiframe. This configuration
has 24 multiframes and each multiframe has a 24-Channel PCM signal (8 bits/channel) and a S bit (superframe
bit). Figure 2-12 shows the frame configuration, and Table 2-5 shows frame bit assignment.
Figure 2-12   DTI Frame Configuration (24-Multiframe)
SCH1
112345678 12345678CH2
12345678CH3
123...

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• The S-bit is the first bit in each frame.
• Frames are repeated in the order shown above.
• Frames 6, 12, and 24 become signal frames.
• “m” in the “4 kbps Data Link” column means that the frame is usually assigned to 1.
Note:For ISDN the A B C D signal Bits are not used. ISDN uses channel 24 (D channel) for signalling.Table 2-5  24-Multi Frame Bit Assignment
FRAME
No.S BIT
FRAME 
SYNCHRONIZATION4 Kbps DATA LINK CRC
1m
2CB1
3m
40
5m
6CB2...

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