NEC Neax 2000 Ivs2 Q-Sig System Manual

 NEAX2000 IVS2 Q-SIG System ManualPage 4  ND-70923 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
System Outline
SYSTEM OUTLINE
Summary
This feature allows the PBX to provide basic connection service for interfacing with the other PBX
by using Layer 3 protocol which conforms to ETS 300 172. ETS 300 172 is standardized for
private telecommunication network as Inter-exchange signaling protocol for circuit mode basic
services by European Telecommunication Standards Institute (ETSI). The Q-SIG protocol...

CHAPTER 1  GENERAL INFORMATION
System Outline
NEAX2000 IVS2 Q-SIG System Manual    
ND-70923 (E), Issue 1.0   Page 5
Physical Interface 30DTI
On the Q-SIG system, a 2 Mbps digital interface is used for the interface trunk.
A D Channel Handler is required for each physical interface. A single data link channel can
control a maximum of 30 B Channels.
Figure 1-2  Physical Interface
Physical Interface 24DTI
On the Q-SIG system, a 1.544 Mbps digital interface is used for the interface trunk.
A D Channel...

 NEAX2000 IVS2 Q-SIG System ManualPage 6  ND-70923 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
System Outline
Interworking with Other Network
The PBX can be connected with the other manufacturer’s PBX by the Q-SIG interface, and the
Q-SIG network can interwork with the other network.
Figure 1-4  Interworking with Other Network
NEC ISDN
Q-SIG
Network
ACIS
Existing Office
Existing OfficeCCISQ-SIG interface
Other Manufacturer
NOTE:Interworking between Q-SIG and CCIS is not available.
Network 

CHAPTER 1  GENERAL INFORMATION
System Configuration
NEAX2000 IVS2 Q-SIG System Manual    
ND-70923 (E), Issue 1.0   Page 7
SYSTEM CONFIGURATION
Figure 1-5 shows the system configuration of the Q-SIG system.
Figure 1-5  System Configuration of Q-SIG
CLOCK 
PBX
30B/23B SLT
FPMP
30-CHANNEL PCM/23B 
DIGITAL LINE
DTI: 30/24-Channel Digital Trunk Interface
DCH: D Channel Handler
PLO: Phase Locked Oscillator
D
TDSW
DCH
DTI
PLO LC
NETWORK
Dterm
DLC
Q-SIG 

 NEAX2000 IVS2 Q-SIG System ManualPage 8  ND-70923 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
System Configuration
30DTI
The Digital Trunk Interface (DTI) interfaces the PBX directly to 30-channel PCM transmission
line. The 30-DTI has the following functions.
 Unipolar/Bipolar Conversion (HDB3 Format)
 Signaling Insertion/Extraction
 Alarm Detection/Insertion
 Digital PAD on Voice Signal Transmission
 Cyclic Redundancy Checking (based on ITU-T Rec. G704)
 Channel Associated Signaling (based on...

CHAPTER 1  GENERAL INFORMATION
System Configuration
NEAX2000 IVS2 Q-SIG System Manual    
ND-70923 (E), Issue 1.0   Page 9
PLO
The Phase Locked Oscillator (PLO) equipped on the MP card is responsible to synchronize the
system to Q-SIG clocks.
The PLO generates the clock signals according to the source clocks received from network. The
source clock signals are extracted at DTI cards and supplied to the PLO. Two clock routes are
available; one is the Route 0 to receive clock signals from DTI0, and the...

 NEAX2000 IVS2 Q-SIG System ManualPage 10  ND-70923 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
Card Name and Function
CARD NAME AND FUNCTION
Table 1-1 shows the circuit card name and function for Q-SIG.
Table 1-1  Q-SIG Card Name and Function
CARD NAMEFUNCTIONAL
NAMEFUNCTION
PN-CP14 MP Main Processor Card
Provides Memory, TDSW (1024CH x 1024CH), 16-line 
CFT, PB sender, Clock, PLO 2 ports (receiver mode/
source mode), two RS-232C ports, 2-line DAT 
(Recording duration: Max. 128 sec.), DK, 4-line PB...

CHAPTER 1  GENERAL INFORMATION
System Capacity
NEAX2000 IVS2 Q-SIG System Manual    
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SYSTEM CAPACITY
Table 1-2  System Capacity for Q-SIG
DESCRIPTION 24DTI 30DTI
DTI Card 8 4
DCH Card 8 4
Trunks for DTI 192 124
Q-SIG Routes 8 4
Trunks per Q-SIG Route 23 30
MP (Internal PLO) Card 1 1
Port per DTI Card 24 32
Port per DCH Card 1 1 

 NEAX2000 IVS2 Q-SIG System ManualPage 12  ND-70923 (E), Issue 1.0
CHAPTER 1  GENERAL INFORMATION
System conditions
SYSTEM CONDITIONS
Time Slot Assignment Condition
As shown in Figure 1-7, the 30DTI/DCH card uses the time slot on the basic Highway 4.
Therefore, the total number of time slots for all 30DTI/DCH cards must be 128 time slots or less
including all other application processor cards, which use the Highway 4.
The 24DTI/PRT card can use the time slot on both the basic and expanded Highway 4 and...

CHAPTER 1  GENERAL INFORMATION
System conditions
NEAX2000 IVS2 Q-SIG System Manual    
ND-70923 (E), Issue 1.0   Page 13
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 discontinuous channels in this case, the system also allocates time
slots to channels not assigned.
For example, as shown in Figure 1-8,...