NEC Neax2000 Ivs Isdn System Manual

							ND-45857 (E) CHAPTER 2
Addendum-001 Page 3
AUGUST, 1998 Revision 3.1
SYSTEM DESCRIPTION
CHAPTER 2 SYSTEM DESCRIPTION
1. GENERAL
This chapter explains the system configuration, additional hardware and system specifications pertaining to
ISDN of the PBX.
2. SYSTEM CONFIGURATION
2.1 System Outline
The PBX can interface with an ISDN with Primary Rate Interface (1.5 Mbps PCM - 23B + D), Basic Rate In-
terface (144 kbps PCM - 2B + D) and ISDN Terminal.
2.1.1 System Outline of ISDN with PRI
When installing ISDN-PRI for a NEAX2000 IVS, two circuit cards are required. A PN-24DTA/24DTA-A 24-
channel Digital Trunk Interface (DTI) card is used to interface to the digital network, and satisfies the require-
ments for ISDN Layer 1. A PN-SC01 D Channel Handler (DCH) card is used to transmit and receive D Channel
signaling data to/from the network. A phase-locked oscillator (PLO) is required to synchronize the PBX with
the network.
Figure 2-1 shows the connection diagram for PBX and ISDN Line with PRI.
Figure 2-1   Connection Diagram for PBX and ISDN Line with PRI
ISDN PBX
23B
D
Multiline
DLC
FP
DCH
24-CHANNEL PCM 
DIGITAL LINE (23B + D)
DTI: 24-Channel Digital Trunk Interface
DCH: D Channel Handler
PLO: Phase Locked Oscillator in MP
CSU: Connection Service Unit TDSW
NETWORK
LC SLT
CLOCK
SIGNAL 
DTI
MP
PLO
CSU
Te r m i n a l 
						

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SYSTEM DESCRIPTION
2.1.2 System Outline of ISDN with BRI
When the system is to be interfaced with a relevant ISDN exchange with the Basic Rate Interface (BRI), it is
necessary to install a BRI card for the digital network interface. A Phase Locked Oscillator (PLO) is required to
synchronize the PBX with the network.
Figure 2-2 shows the connection diagram of ISDN with BRI.
Figure 2-2   Connection Diagram for PBX and ISDN Line with BRI
ISDN PBX
2B
Multiline 
DLC
FP
2-CHANNEL PCM 
DIGITAL LINE (2B + D)
NT1: Network Termination Device 1
BRI: Basic Rate Interface
PLO: Phase Locked Oscillator TDSW
NETWORK
LC SLT
CLOCK
SIGNAL 
BRI
MP
PLO
D channel
NT1
Terminal 
						

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SYSTEM DESCRIPTION
2.1.3 System Outline of ISDN Terminal
When providing the system with an ISDN Terminal, it is necessary to install an ISDN Line Circuit (ILC) card
for the line interface of an ISDN Terminal and an ISDN Channel Handler (ICH) card for layer 2 protocol pro-
cessing (LAP-D).
Figure 2-3 and Figure 2-4 show the connection diagram of ISDN Terminal.
Figure 2-3   Connection Diagram of ISDN Terminal (for ISDN with PRI)
Note 1:When providing ISDN Terminal, the ILC and ICH are necessary.
Note 2:The following connections are only available.
• ISDN Terminal to ISDN Terminal Connection
• ISDN Terminal to ISDN Trunk (DTI) Connection
• ISDN Trunk (DTI) to ISDN Terminal Connection
• ISDN Terminal to Single Line Telephone Connection
• ISDN Terminal to Multiline Terminal Connection
ILC
2D
ISDN PBX
23B
D
PLO
ILC
ISDN
FPMP
DTI
DCH
DTI: 24-Channel Digital Trunk Interface
DCH: D Channel Handler
PLO: Phase Locked Oscillator
ILC: ISDN Line Circuit
ICH: ISDN Channel Handler
TA: Terminal Adapter
CSU: Connection Service Unit TDSW
NETWORK
ICH
ICHCLOCK
SIGNAL
2D/8D 2D/8D
Terminal
(TE) • Point to Point
Connection
2B x 2
2D
2B x 2
TA • Point to Multi-point
Connection
Data
TerminalISDN Terminal
(TE)
24-CHANNEL PCM
DIGITAL LINE (23B + D)
CSU
SLT
LC
(PLO)
DLC Multiline 
Terminal 
						

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SYSTEM DESCRIPTION
Figure 2-4   Connection Diagram of ISDN Terminal (for ISDN with BRI)
ILC
2D
ISDN PBX
2B
D channel
PLO
ILC
ISDN
FP
BRI
NT1: Network Termination Device 1
BRI: Basic Rate Interface
PLO: Phase Locked Oscillator
ILC: ISDN Line Circuit
ICH: ISDN Channel Handler
TA: Terminal Adapter TDSW
NETWORK
ICH
ICHCLOCK
SIGNAL
2D/8D 2D/8D
Terminal
(TE) • Point to Point
Connection
2B x 2
2D
2B x 2
TA • Point to Multi-point
Connection
Data
TerminalISDN Terminal
(TE)
2-CHANNEL PCM
DIGITAL LINE (2B + D)
Note 1:When providing ISDN Terminal, the ILC and ICH are necessary.
Note 2:The following connections are only available.
• ISDN Terminal to ISDN Terminal Connection (S/T Interface)
• ISDN Terminal to ISDN Trunk (BRI) Connection (S/T Interface)
• ISDN Trunk (BRI) to ISDN Terminal Connection (S/T Interface)
• ISDN Terminal to Single Line Telephone Connection
• ISDN Terminal to Multiline Terminal Connection
NT1
SLT
LC
MP
(PLO) Multiline 
DLC Te r m i n a l 
						

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SYSTEM DESCRIPTION
2.1.4 System Outline of Event Based CCIS
Event Based CCIS allows a PBX customer who does not have a tie line (or when a customer can not use the tie
line due to the busy or fault of the line), to use the various CCIS feature by using the ISDN line as a CCIS virtual
tie line, on the 2400 ICS - 2000 IVS connection or the 2000 IVS - 2000 IVS connection. For the PBX customer
who usually has low traffic, Event Based CCIS allows the CCIS feature by the virtual tie line, without adding a
large scale system.
Figure 2-5 shows the outline of Event Based CCIS.
Figure 2-5   Outline of Event Based CCIS
LC/TRKCCH DTI/BRI 2000 IVSLC/TRK CCH DTI/BRI2000 IVS ISDN NETWORK EVENT BASED CCIS CONNECTION
LC/TRKCCH DTI/BRI 2000 IVSLC/TRK CCH DTI/BRI2000 IVS ISDN NETWORK REGULAR ISDN CONNECTION
or
2400 ICS
or
2400 ICS 
						

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SYSTEM DESCRIPTION
• COMMON CHANNEL AND VOICE CHANNEL LINK CONTROL
When the call is a regular ISDN call, or when there is no call on the PBX, the common channel and the voice
channel for virtual tie line is disconnected.
If the sub-address sent from an extension or a trunk informs the number to activate the CCIS link, the PBX
performs making a CCIS link. When the opposite office sends the answering signal (“connect”) to the ISDN
network, a connection between ISDN line and the Common Channel Handler (CCH) card is made, then the
virtual tie line (Event Based CCIS) is formed.
When receiving the signal from the opposite office, and the sub-address includes the trunk number of CCH
card, the PBX performs making CCIS connection as the same method.
If the virtual tie lines are all busy, or when the virtual tie line connection can not be made due to a line fault, a
call is transmitted to the opposite office via ISDN network as a regular ISDN call not as a CCIS call.
When certain time passes after all calls finish, the voice channel and common channel is released and CCIS
link is disconnected. The release timer can be set by the system data programming for common channel and
voice channels respectively. 
						

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SYSTEM DESCRIPTION
2.2 DTI
The Digital Trunk Interface (DTI) interfaces the PBX to the ISDN Line and provides the following functions.
• Unipolar/Bipolar Conversion (AMI Format)
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Loop-Back Test (Local/Remote Loop Back)
• Cyclic Redundancy Checking (based on ITU-T Rec. G704) for ESF Framing
For connections of DTI and transmission line, twisted-pair cable can be used.
2.3 DCH
The D Channel Handler (DCH) provides the D Channel signalling interface through the DTI to an ISDN line,
and it is responsible for signalling between the PBX and the ISDN network under control of the system MP.
2.4 BRI
The Basic Rate Interface (BRI) provides one or two physical interfaces to the ISDN-Basic Rate Interface service
(144 kbps PCM - 2B + D).
The BRI has the following functions.
• Unipolar/Bipolar Conversion (AMI Format)(S/T Interface)
• Signalling Insertion/Extraction
• Frame Synchronization
• Digital PAD on Voice Signal Transmission
For connections of BRI and transmission line, twisted-pair cables can be used.
2.5 PLO
The Phase Locked Oscillator (PLO) is responsible for providing synchronization between the TDSW and an
ISDN exchange. In the PBX, the internal PLO equipped with the MP card or the PLO card (PN-CK00) is used.
When the PBX is a slave office, the PLO generates a synchronized clock signal according to the master clock
signals supplied from the ISDN network, and supplies the generated clock signal to the TDSW. The PLO is sup-
plied with clock signals extracted by DTI/BRI. The PLO can be equipped with two clock supply routes; one is
the Route 0 to receive clock signals normally, and the other is a standby Route 1 to receive clock signals when
no clock signals from the Route 0 due to the transmission line failure. If the PBX requires two clock supply
routes and those frequency differ from each other, the PLO card is required. When no clock signals from the
Route 0 and the Route 1, the PLO keeps to generating the clock signals with the frequency of previous master
clock. When using the internal PLO equipped with the MP card, only slave synchronization is possible.
When the PBX is a master office, the PLO card is required. The PLO card generates the clock signals as master
clock for providing synchronization between the TDSW and another office.
Figure 2-6 shows an example of clock supply route configuration. 
						

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SYSTEM DESCRIPTION
Figure 2-6   Clock Supply Route Configuration
2.6 ICH
The ISDN Channel Handler (ICH) provides the D channel signalling interface and controls an ILC (Layer 2 and
3). PN-SC02 is the 2channel ICH card and PN-SC03 is the 8channel ICH card.
2.7 ILC
The ISDN Line Circuit (ILC) provides a physical interfaces to the ISDN Terminal. The interface provides for a
maximum of 2 line circuit.
PBX
TDSW
DTI/BRI PBX
TDSW
DTI1/BRI1
PLO
ISDN
NETWORK
DTI0/BRI0
PLO
: CLOCK SIGNAL SUPPLY ROUTE 0
: CLOCK SIGNAL SUPPLY ROUTE 1Note:In this configuration, DTI0/BRI0 and DTI1/
BRI1 must be mounted in PIM0. 
						

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SYSTEM DESCRIPTION
2.8 Equipment for Event Based CCIS
For Event Based CCIS, the Virtual Trunks which are used as a No. 7 CCIS trunk, the existing CCH card and
DTI/BRI card are required to activate No. 7 CCIS link (virtual tie line connection) on an ISDN network.
Virtual Trunk:
The Virtual Trunk consists of a Home-Side Trunk and a Mate-Side Trunk. The Home-Side Trunk is con-
nected to the station side, and the Mate-Side Trunk is connected to network side of the PBX virtually. (See
Figure 2-7).
The virtual trunks does not exist actually, but are handled as No. 7 CCIS trunk by the system, for system
data. ISDN sub-address programmed to the virtual trunk is used to establish a CCIS link and individual
voice link.
Figure 2-7   Virtual Trunk
CCH Card:
The CCH card is used to handle the common channel signaling.
DTI/BRI Card:
The system uses the same interface trunk (PRI/BRI card) for regular ISDN connection and the virtual tie
line connection on Event Based CCIS.
TDSW
DTI/BRI
LC/TRKISDN
MATE-SIDE
HOME-SIDEV IRTUAL
TRUNK 
						

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SYSTEM DESCRIPTION
3. SYSTEM SPECIFICATION
3.1 System Capacity
3.1.1 System Capacity for ISDN with PRI
3.1.2 System Capacity for ISDN with BRITable 2-1  System Capacity for ISDN with PRI
DESCRIPTION CAPACITY REMARKS
Max. No. of DTI Card 5 Depending on the No. of DCH
Max. No. of DCH Card 5
Max. No. of Trunks for DTI 115 115 B channels
Max. No. of ISDN Lines 5 1 Line/DTI
Max. No. of Trunks per ISDN Line 23 23 B channels per ISDN link
Max. No. of PLO Card 1
Max. No. of Time Slot per DTI Card 24
Max. No. of Time Slot per DCH Card 1
Table 2-2  System Capacity for ISDN with BRI
DESCRIPTION CAPACITY REMARKS
Max. No. of BRI Card 12
Max. No. of Trunks for BRI 24
Max. No. of PLO Card 1
Max. No. of ICH Card 12
Max. No. of ILC Card 12/48 Using SC02/SC03
Max. No. of Time Slot per BRI Card 2/4 Using BRTA/2BRTC
Max. No. of Time Slot per ICH Card 1/4 Using SC02/SC03
Max. No. of Time Slot per ILC Card 5