NEC Neax 2000 Ivs2 Ccis System Manual

							 NEAX2000 IVS2 CCIS System ManualPage 18  ND-70918 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
Time Slot Allocation for DTI Card
On each DTI card, the system recognizes the lowest and highest channel numbers to which trunk
numbers are assigned, and allocates time slots to all the channels between them. If trunk
numbers are assigned to nonconsecutive channels, the system also allocates time slots to
channels not assigned.
For example, as shown in Figure 1-7, when Channel 1 through Channel 10 have been assigned
by system data programming (CM07 YY=01) except Channel 5, the system allocates a total of
10 time slots for all ten channels. Therefore, to avoid allocation of unnecessary time slots, it is
recommended that consecutive channels be assigned on each DTI card.
Figure 1-7  Time Slot Allocation for DTI
DXXX
DXXX
DXXX NONE
DXXX
NONEDXXX
1
CH010
9
6
4 5HIGHEST CHANNEL
10 TIME SLOTS ARE 
ALLOCATED EVEN 
WHEN CH5 IS NOT 
ASSIGNED.
LOWEST CHANNEL 
						

							CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
NEAX2000 IVS2 CCIS System Manual    
ND-70918 (E), Issue 1.0   Page 19
Number of Time Slots Required for DTI/CCH Card
(1) When the system is serving as a Lower Hierarchy Office within the network, 1 time slot is 
allocated for setting up a fixed path between the DTI/ODT and the CCH as the common 
signaling channel.
(2) When the system is serving as a High Hierarchy Office within the network, 1 time slot is 
allocated to the distant Main Office and distant Local Office for the common signaling 
channel.
NOTE 1:A billing information from distant Local Office is transferred as follows.
AP00→MP→CCH
NOTE 2:When a common signaling data link is provided via a MODEM, the time slot for the
common signaling channel is not required. 
						

							 NEAX2000 IVS2 CCIS System ManualPage 20  ND-70918 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
Figure 1-8 shows the CCH time slot assignment for CCIS with Digital Interface.
Figure 1-8  CCH Time Slot Assignment (for No. 7 CCIS with Digital Interface)
A
B
CM
TDSW
DTI
CCH
AP00
MP
TDSW
DTI
CCH
AP00
DTI
CCH
DTI
CCH
DTI
CCH
MPM: Main Office
D : Local Office (High Hierarchy Office)
A, B, C: Local Office (Low Hierarchy Office)
To Local Office D
(1 time slot)
To Main Office M
(1 time slot)
To Local Office A
(1 time slot)
To Local Office B
(1 time slot)
To Local Office C
(1 time slot)   
Network Configuration:
  When the System locates at A, B, or C (Low Hierarchy Office) in the above network:
  When the System locates at D (High Hierarchy Office) in the above network:
 
D 
						

							CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
NEAX2000 IVS2 CCIS System Manual    
ND-70918 (E), Issue 1.0   Page 21
Figure 1-9 shows the CCH time slot assignment for No. 7 CCIS with Analog Interface.
Figure 1-9  CCH Time Slot Assignment (for No. 7 CCIS with Analog Interface)
TDSW
TDSWM: Main Office
D : Local Office (High Hierarchy Office)
A, B, C: Local Office (Low Hierarchy Office)
  Network Configuration:

  When the System locates at A, B, or C (Low Hierarchy Office) in the above network:

  When the System locates at D (High Hierarchy Office) in the above network:
LDT/ODT
LDT/ODT
CCH MODEM
To Local  
Office D
(1 time slot)
LDT/ODT
LDT/ODT
CCH MODEM
To  M a i n   
Office M
(1 time slot)
LDT/ODT
LDT/ODT
To Local  
Office  
A, B or C
CCH MODEM
(1 time slot)
TDSW
LDT/ODT
LDT/ODT
To Local  
Office D
(1 time slot)
TDSW
LDT/ODT
LDT/ODT
To  M a i n   
Office M
(1 time slot)
LDT/ODT
LDT/ODT
To Local  
Office  
A, B or C
(1 time slot)
CCH MODEM
LDT/ODT
LDT/ODT
CCH MODEM
LDT/ODT
MODEMCCH
A
B
CM
D 
						

							 NEAX2000 IVS2 CCIS System ManualPage 22  ND-70918 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
Table 1-4 shows the number of time slots for each of the cards required for No. 7 CCIS with Digital
Interface and Ta b l e  1 - 5 shows the number of time slots for each of the cards required for No. 7
CCIS with Analog Interface.
Table 1-4  Number of Time Slots Required per DTI/CCH/AP00 Card 
(for No. 7 CCIS with Digital Interface)
CARDNUMBER OF TIME 
SLOTS PER CARDREMARKS
PN-24DTA-C
1-24  Number of CCIS channels (the number of 
CCH) + number of trunks assigned
PN-30DTC-A1-31
PN-SC001  For a distant Main Office
–  Common Signaling Channel: 1 time slot
1  For a distant Local Office
–  Common Signaling Channel: 1 time slot
PN-AP00-B0 
						

							CHAPTER 1  GENERAL INFORMATION
Time Slot Assignment Condition
NEAX2000 IVS2 CCIS System Manual    
ND-70918 (E), Issue 1.0   Page 23
Table 1-5  Number of Time Slots Required per CCH/AP00 Card
(for No. 7 CCIS with Analog Interface)
CARDNUMBER OF TIME 
SLOTS PER CARDREMARKS
PN-SC00
1  For a distant Main Office
–  Common Signaling Channel: 1 time slot
1  For a distant Local Office
–  Common Signaling Channel: 1 time slot
PN-AP00-B0 
						

							 NEAX2000 IVS2 CCIS System ManualPage 24  ND-70918 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
DTI Specifications
DTI SPECIFICATIONS
Transmission Characteristics
Table 1-6  Transmission Characteristics
CHARACTERISTICS 24-CHANNEL 30-CHANNEL
(1) Output
 Line Rate 1.544 Mbps ±50 ppm 2.048 Mbps ±50 ppm
 Line Code  AMI with ZCS/B8ZS* HDB3 (High Density Bipolar 3)
 Line Impedance 100 ohms 75 ohms + 100 µH
(Coaxial Cable)
120 ohms + 160 µH
(Twisted-Pair Cable)
 Pulse Amplitude 
(Base to Peak)3 volts ±0.6 volts 2.37 volts nominal
(Coaxial Cable)
3 volts nominal
(Twisted-Pair Cable)
 Pulse Width 324 ns ±30 ns 244 ns nominal
(2) Input
 Line Rate 1.544 Mbps ±200 bps (130 ppm) 2.048 Mbps ±50 ppm
 Pulse Amplitude
(Base to Peak)1.5 volts – 3 volts 1.5 volts – 2.7 volts
(Coaxial Cable)
1.5 volts – 3.3 volts
(Twisted-Pair Cable)
Frame 
Synchronization 
Pa tte r n100011011100
 Input Jitter ITU-T Fig. 1/G743 ITU-T Fig. 1/G743
 Wander +138UI, –193UI or 
–138UI, +193UIITU-T G823
 Cable Length from 
PBX to MDF or 
External EquipmentMax. 200 m (MAX 656.2 ft.)
[with 0.65 
φ (22 ABAM) twisted-
pair cable]Max. 400 m (MAX 1312.4 ft.)
[with 0.65 φ (22 ABAM) 
twisted-pair cable]
* AMI: Alternate Mark Inversion
ZCS: Zero Code Suppression
B8ZS: Bipolar Eight Zero Substitution 
						

							CHAPTER 1  GENERAL INFORMATION
DTI Specifications
NEAX2000 IVS2 CCIS System Manual    
ND-70918 (E), Issue 1.0   Page 25
Frame Configuration of 24-DTI
According to the AT&T Specifications for 24-channel transmission, there are two types of frame
configurations: 12-Multi Frame (D4) and 24-Multi Frame (ESF).
(1) 12-Multi Frame (D4)
The frame has 12-Multi Frames, and each Multi frame has a 24-channel PCM signal (8 bits/
channel) and an S bit (Super Frame Bit). Figure 1-10 shows the frame configuration, and 
Ta b l e  1 - 7 shows frame bit assignment.
Figure 1-10  Frame Configuration of 24-DTI (12-Multi Frame)
SCH1 CH2 CH3 CH24
12 345 67812 34567812 345 678 12345 678
FRAME 1 FRAME 2 FRAME 3 FRAME 12
125 sm
S: SUPERFRAME BIT  
						

							 NEAX2000 IVS2 CCIS System ManualPage 26  ND-70918 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
DTI Specifications
* The S-bit is the first bit in each frame.
* Frames are repeated in the order shown above.
* Frames 6 and 12 become signal frames.
Table 1-7  12-Multi Frame Bit Assignment
FRAME
No.S BITBIT No. OF EACH 
CHANNEL
(CH1-CH12)
SIGNAL
CHANNEL
TERMINAL
SYNCHRONIZATION
(FT)SIGNAL
SYNCHRONIZATION
(FS)INFORMATION
SIGNAL BITCONTROL
SIGNAL BIT
11 1-8
201-8
30 1-8
401-8
51 1-8
611-78A
70 1-8
811-8
91 1-8
10 1 1-8
11 0 1-8
12 0 1-7 8 B 
						

							CHAPTER 1  GENERAL INFORMATION
DTI Specifications
NEAX2000 IVS2 CCIS System Manual    
ND-70918 (E), Issue 1.0   Page 27
(2) 24-Multi Frame (Extended Super Frame )
This frame has 24-Multi Frames and each Multi frame has a 24-Channel PCM signal (8 bits/
channel) and an S bit (Super Frame Bit). Figure 1-11 shows the frame configuration, and 
Ta b l e  1 - 8 shows frame bit assignment.
Figure 1-11  Frame Configuration of 24-DTI (24-Multi Frame)
TS0 TS1 TS2 TS15 TS16 TS17 TS30 TS31
FRAME 0 FRAME 1 FRAME 2 FRAME 3 FRAME 14 FRAME 15
125 secm