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 for all DTI/BRI cards must be less than 512 time slots including all L/T
cards.
Figure 2-8   Accommodation of DTI/DCH/ICH into TDSW
TDSW (1024 TIME SLOTS)
FP0
FP1
FP3 FP2MAX.128 TIME SLOTS
MAX.128 TIME SLOTS
MAX.128 TIME SLOTS MAX.128 TIME SLOTS
DTI
BRI
AP00ICHMAX.24 TIME SLOTS/CARD
1 TIME SLOTS/CARD
1 TIME SLOTS/CARD SC02: 1 TIME SLOTS/CARD
EXTMEM 1 TIME SLOTS/CARD
FOR L/T CARDS +DTI CARDS : MAX.512 TIME SLOTS PER SYSTEM
FOR L/T CARDS : MAX.512 TIME SLOTS PER SYSTEM
FOR AP CARDS : MAX.128 TIME SLOTS PER SYSTEM
DCH
BRTA: MAX. 2 TIME SLOTS/CARD
2BRTC: MAX. 4 TIME SLOTS/CARD
SC03: 4 TIME SLOTS/CARD 
						

							CHAPTER 2 ND-45857 (E)
Pag e 1 4
Revision 3.0
SYSTEM DESCRIPTION
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 assigned by the sys-
tem data programming (CM07 YY = 01) excepting Channel 5, the system allocates a total of 10 time slots for
all the ten channels. Therefore, to avoid allocation of unnecessary time slots, it is recommended that consecutive
channels are assigned on each DTI card.
In the case of the DCH card, one time slot is allocated for setting up a fixed path between the DTI and the DCH
by assigning Channel 23 of the DTI as the D Channel.
Figure 2-9   Time Slot Allocation for DTI
10
9
6
5
4
1
CH0DXXX
DXXX
DXXX
NONE
DXXX
DXXX
NONELOWEST CHANNELHIGHEST CHANNEL
10 TIME SLOTS ARE
ALLOCATED EVEN
WHEN CH5 IS NOT
ASSIGNED. 
						

							ND-45857 (E) CHAPTER 2
Addendum-001 Page 15
AUGUST, 1998 Revision 3.1
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) twisted-pair cable is used.
ILC(A)
ILC(B)
ILC(C)No. 1  – No. 8
No. 1  – No. 8
Max. 1310 ft.*
Max. 1965 ft.*
Max. 491 ft.*PBX
BRINT1TO ISDN
Max. 3280 ft.*
: 
ISDN Terminal
(A): Point to Point Connection
(B): Point to Multipoints Connection 
(Extended Passive Bus)
(C): Point to Multipoints Connection (Short 
Distance Passive Bus)
MDF
Max. 164 ft.*
DTICSUTO ISDN
Max. 655 ft.** (600 m) (1000 m)
(200 m)
(150 m) (400 m)
(50 m) 
						

							CHAPTER 2 ND-45857 (E)
Pag e 1 6
Revision 3.0
SYSTEM DESCRIPTION
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 line by assign-
ing different route data on system data programming.
• This feature supports voice calls only. (Supported object at PBX transmission side: single line tele-
phone, Multiline Terminal, DID/E&M/Ring Down [analog/T1] tandem calls.)
The data calls are transmitted via the regular ISDN network.
• The Peg Count (the number of originating call from the ISDN trunk) is counted when using the ISDN
line for the virtual tie line by route basis.
• Billing information of the virtual tie line using the ISDN line can be treated as regular tie line calls.
• Billing information of the virtual tie line using the ISDN line can be treated on tandem calls.
• The voice channel of the virtual tie line is released at a certain time after the call finishes.
The common signaling channel of virtual tie line is released at a certain time after all calls on voice
channels finish. (The release timer is determined by the system data, toward the voice channel and the
common signaling channel respectively).
Figure 2-11   Release Timing of Virtual Tie Line and CCIS Link
Release VT (B1)
Release VT (B3)
Release VT (B2)
Release CCIS (B3)
Release CCIS (B2)Set VT (B3)
Set VT (B1) Voice ch 1 (B2)
Voice ch 2 (B3)
CCIS link (B1)
n sec.
n sec.
m sec.
Set VT (B2)
n, m: Release timer
2.4 seconds – max. 28 minutes
VT: Vir tual Tie Line 
						

							ND -4 5857 ( E)  CHAPTER 2
SYSTEM DESCRI PTION
X   :Ava ilab le 
						

							CHAPTER 2  ND -4 5857 ( E)
S YST EM D ESCRIP TIO N
X  :Ava ilab le 
						

							ND-45857 (E) CHAPTER 2
Page 19
Revision 3.0
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 ± 200 bps (130 ppm)
• Pulse Amplitude (Base to Peak) 1.5 volts – 3 volts
• Frame Synchronization Pattern 001011(24MF)
• Input Jitter ITU-T Fig. 1/G743
• Wander +138U1, –193UI or –138UI, +193UI
• Cable Length from PBX to CSU
• To Connect with CSU via BRI Max. 1000 m (3280 ft.) (with 0.5ø twisted-pair cable)
• To Connect with CSU via DTI Max. 200 m (655 ft.) (with 0.65ø twisted-pair cable) 
						

							CHAPTER 2 ND-45857 (E)
Pag e 2 0
Revision 3.0
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 45678CH24
FRAME 1 FRAME 2 FRAME 3 FRAME 24
125 µs
S: Superframe bit 
						

							ND-45857 (E) CHAPTER 2
Page 21
Revision 3.0
SYSTEM DESCRIPTION
• 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
7m
80
9m
10 CB3
11 m
12 1
13 m
14 CB4
15 m
16 0
17 m
18 CB5
19 m
20 1
21 m
22 CB6
23 m
24 1 
						

							CHAPTER 2 ND-45857 (E)
Pag e 2 2
Revision 3.0
This page is for your notes.