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7.16 U.S. ISDN (for U.S. Only)

Definition

In the United States, ISDN is offered by most local telephone companies. ISDN is an all-digital voice and data transmission technology. In contrast to analog transmissions, ISDN uses B (bearer) channels to carry voice and data traffic and a D (data) channel to carry customer call data and control signals. There are two basic types of ISDN interfaces. These interfaces are the primary rate interface (PRI) and the basic rate interface (BRI).

A PRI is for large commercial telephony operations and consists of 23 B channels and 1 D channel. A BRI is for smaller or residential-type telephony needs and consists of 2 B channels and 1 D channel. To configure these ISDN interfaces, users must know the type of Hicom 150 E Office system that they are configuring. The following are the ISDN interfaces that were designed to work with the Hicom 150 E Office system:

BRI with the OfficePoint
Both PRI and BRI with the OfficeCom
PRI with the OfficePro
 
The ISDN features are activated at the central office (CO).  

7.16.1 PRI

Introduction

The OfficeCom and OfficePro systems can be configured to support Primary Rate services from the public network. A primary rate interface (PRI) consists of 23 bearer (B) channels and 1 data (D) channel. Each channel supports 64 Kbps of bandwidth.

The OfficePro supports a maximum of five T1 interfaces (TMST1) that can be configured as primary rate interfaces. A Channel Service Unit (CSU) is required for each interface connected to the public network. (Siemens ICN supports certain models of CSU that have been tested with the Hicom 150 E. Contact your Siemens ICN representative for the model numbers). The OfficePro supports a maximum of four Call by Call (CBC) groups. Each group can be configured with a maximum of eight CBC trunk groups.

The OfficeCom supports one T1 interface (TST1 module) that can be configured as a primary rate interface. A CSU is required for each interface connected to the public network. The OfficeCom supports a maximum of one CBC group. The group can also be configured with a maximum of eight CBC trunk groups. Typically, the entire T1 span is placed in a single trunk group, but depending on the application, the primary rate channels can be separated into discrete route groups. This may be required for applications where a portion of the channels can be separated out for non-system data applications.

A span or spans must be selected as the reference interface for the Central Office. A hierarchical table is provided for assigning four reference-clock points. If the primary clock source fails, the next clock source specified is used as the reference. When the primary clock source returns, the system automatically resynchronizes to this clock. A maximum of four reference clocks can be defined per system.

Model-Specific Data
Subject 
OfficePro 
OfficeCom 
OfficePoint 
Feature available in 
x 
x 
HW requirements 
TMST1 
TST1 
Number of T1 modules per system 
Number of CBC groups per system 
Number of trunk groups per CBC group 
SW requirements 
Release 1.0 or later 

Depending on the PRI provider's requirements, users need to configure some or all of the following for PRI setup:

Signal, protocol, and emulation type
Frame/line/encoding
B channel allocation mode and identifier
Number of B channels
Trunk group calling service

For networking with PRI, customers can use either tie trunks or the public-switched telephone network.

Protocol type allows customers to select the interface between the OfficeCom or OfficePro and the PRI provider. Protocols are different for local exchange carriers (LECs) and for inter-exchange carriers (IECs). Customers might prefer an IEC, for example, if they want to place calls on a tie trunk using station numbers without going through the local exchange.

Customers can choose a different carrier and protocol for each PRI span. The Hicom 150 E Office system supports seven commonly used LEC protocols and seven commonly used IEC protocols.Table 7-13 and Table 7-14 on page 7-491 show the protocols available for each slot.

LEC Protocols

Table 7-13 Supported LEC Protocols

LEC Carrier 
Switch 
Protocol 
AT&T 
5ESS 
Custom  
AT&T 
5ESS 
NI-2 
Bell Canada 
DMS100 
Custom  
GTE 
GTT5 
NI-2 
Nortel 
DMS100 
Custom  
Siemens 
EWSD 
Custom  
Siemens 
EWSD 
NI-2 

IEC Protocols

Table 7-14 Supported IEC Protocols

IEC Carrier 
Switch 
Protocol 
AT&T 
4ESS 
Custom  
MCI 
DMS250 
AT&T 4ESS emulation 
MCI 
DEX600 
AT&T 4ESS emulation 
Sprint 
DMS250 
AT&T 4ESS emulation 
Westinghouse 
DMS250 
AT&T 4ESS emulation 
GSA 
DMS250 
DMS250 
GSA FTS 2000 
5ESS 
5ESS 

Emulation type is determined by the protocol. Users need to select the emulation type that matches the ISDN service they have ordered: Super Frame (SF) or Extended Super Frame (ESF).

The data format for SF emulation is inverted high-level data link control (HDLC); The data format for ESF is normal HDLC.

Frame/line/encoding allows customers to select the type of encoding used on the D channel. The choices are normal or inverted. Normal is the default. The type of frame and line encoding depends on the protocol. OfficeCom automatically sets the correct type of frame and line encoding according to the protocol.

B channel allocation mode and identifier allows customers to select the system method of finding an available B channel when needed. The choices are high and low. High begins searching at the highest-numbered B channel of the highest-numbered T1 span in the PRI trunk group and continues in descending order. Low begins searching at the lowest-numbered B channel of the lowest-numbered T1 span in the PRI trunk group and continues in ascending order.

Select the opposite mode from that used by the CO; this will avoid collisions when both the CO and the Hicom 150 E Office are trying to seize a channel.

Number of B channels allows users to enter the number of B channels for the system, so that the system knows where to begin searching for channels to allocate. The number entered here depends on the number of B channels that the customer has ordered.

Trunk group calling service allows users to select the type of service for each trunk group. The OfficeCom and OfficePoint support 36 types of trunk group service. Customers select the type of service according to the service ordered from the ISDN provider.
 
If you are unsure the trunk group calling service, consult the ISDN provider for more information.  

The following tables outline the voice and data services available through the public network providers in the North American market.

Table 7-15 Inter-Exchange (IEC) Protocol Calling Services

 
ATT 4ESS 
MCI DMS250/MCI
DEX600 
SPRINT
DMS250 
Westing.
DMS250 
FTS2000
DMS/5ESS 
In-WATS (800) 
Megacom 800-TFM 
MCI 800 
ULTRA 800 
WICN-InWATS 
N/A 
Out-WATS 
Megacom 
MCI Prism-WATS 
SPR Ultra WATS 
WICN-OutWATS 
N/A 
In-WATS (900) 
Multiquest 
MC!/900 
N/A 
N/A 
N/A 
Intl IN-WATS 
Inter-800 
MCI 800 
N/A 
N/A 
N/A 
PVN 
AT&T SDDN 
MCI VN-VS 
SPRINT-VPN 
N/A 
N/A 
Intl VPN 
AT&T SDN-GSDN 
N/A 
SPRINT-VPN 
N/A 
N/A 
SDS 56 
Accu-SDS 
NONE 
Accu-SDS 
Accu-SDS 
N/A 
SDS 94-c/r 
Accu-SDS 
NONE 
Accu-SDS 
Accu-SDS 
N/A 

Table 7-16 Local Exchange (LEC) Protocol Calling Services

 
AT&T
5ESS/ 
Siemens EWSD 
Nortel
DMS100 
Bell Cnd
DMS100 
Generic NI2 
Siemens NI2 
AT&T 5ESS NI2 
In-WATS (800) 
Megacom 
DMS100 InWATS 
NI2 InWATS 
Out-WATS 
Megacom 
DMS100 OutWATS 
NI2 OutWATS 
In WATS (900) 
N/A 
N/A 
N/A 
Intl InWATS (800) 
N/A 
N/A 
N/A 
PVN 
N/A 
DMS100 PV 
N/A 
Multiband OutWATS 
Megacom 
DMS100 OutWATS 
NI2 OutWATS 
Access to LEC operator 
None 
None 
None 
Access to default IEC operator 
None 
None 
None 
Equal access to IEC Long Distance services 
Megacom 
DMS100 OutWATS 
NI2 OutWATS 
Basic CO access 
None 
None 
None 
Access to IEC operator 
None 
None 
None 
SDS-56 
None 
None 
None 
SDS-64 c/r 
None 
None 
None 

7.16.2 BRI

Introduction

To set up the Hicom 150 E Office for BRI ISDN, users must receive service profile identifier designator (SPID) numbers from the telephone company (telco). SPID numbers identify the type of ISDN service and the variety of features that customers receive. In addition, to allow direct access to specific devices, some BRI interfaces can be set up with CACH EKTS. Depending on the central office (CO) switch type, users have to configure either call appearance identification (CAID) values (also known as CACH values) or phantom direct inward dialing (PDID) numbers for all devices that make external calls. For more information on how to configure CAID numbers, PDID numbers, and SPID numbers refer to Section 8.11, Configuring BRI Trunks (OfficePoint and OfficeCom) (for U.S. Only), on page 8-22.

Depending on the central office (CO) protocol selected, users need to configure some or all of the following parameters for BRI setup:

CO protocol
SPID administration
CAID administration (AT&T or EWSD)
PDID administration (DMS100)
Feature identification number (FIN) for message waiting
CO Features (Transfer/Conference/Drop)
Feature identification number (FIN) for Transfer, Conference and Drop
CACH EKTS flag (AT&T or EWSD)

CO protocol is the interface between the OfficeCom or OfficePoint and the CO of the BRI provider. Select the protocol that the BRI provider uses. OfficeCom and OfficePoint support the following CO protocols:

AT&T NI1
AT&T Custom
Siemens NI1
Nortel NI1

Nortel NI1 requires PDID values instead of CAID values; for more information refer to PDID administration on page 7-496.
 
If you are unsure of the CO protocol, consult the ISDN provider. 

SPID administration allows customers to set service profile identification designator values. Each BRI line is assigned two SPID values. The Hicom 150 E Office system supports a maximum of eight SPID values. The SPID values can be assigned to any combination of digital stations or digital data terminals and could be required for some data terminals. SPID numbers are used by the CO to identify each terminal for features such as message waiting, call transfer, and conference. Customers must configure the numbers in sequence according to the order of the stations in the system. A primary directory number is assigned to each SPID address number.

Consult the BRI provider for specific SPID number information.

CAID administration allows customers to set call appearance identification values when the CO switch type is AT&T or EWSD. CAID values are one or two digits that are assigned by the central office to the primary and secondary system numbers. A CAID value represents a talk path from a voice station or a data terminal to a BRI channel. A station must have at least one associated CAID value programmed to place or receive an external call directly without attendant intervention. Each device in the system can have up to four CAID values.

Multiple CAID values must be assigned to a station to allow for external telephone functions, such as to answer camp-on calls and conference calls. CAID values are used to simulate multiple call handling at a single desktop station. That is, each CAID number simulates an additional extension (a call appearance), but the additional extension numbers do not actually represent outside trunk lines.
 
Some COs do not assign CAID values to ISDN data terminals. If you do not know the CAID numbers assigned to the system, consult the BRI provider.  

PDID administration allows customers to set phantom direct inward dialing identification numbers (PDIDs). PDID numbers take the place of CAID values in the Nortel DMS100 NI1 CO only. Customers can assign PDID numbers to all voice and data terminals in the system. This allows incoming calls to be routed to the specified station or ISDN terminal without attendant intervention.

The PDID number can be from 1 to 7 digits in length, corresponding to a traditional seven-digit phone number.

PDIDs or directory numbers (DNs) are assigned by the ISDN provider.

FIN for message waiting allows users to set the feature identification number (FIN) for the BRI message waiting feature provided by the LEC. The LEC assigns FIN values to associate the feature with specific OfficeCom or OfficePoint stations; contact the LEC to obtain the FIN values for the stations.

The message waiting FIN value can only be assigned to stations with primary directory numbers.

With FIN for message waiting, customers must enter a FIN value for each station. Every station must have a FIN value assigned; however, each station can have the same number.

CO features (Transfer/Conference/Drop) allows the customer to enable the CO features Transfer, Conference, and Drop.

FIN for Transfer, Conference and Drop allows customers to set the feature identification numbers (FIN) for the BRI Transfer, Conference, and Drop features provided by the LEC in the case of NI1 (AT&T NI1, Siemens NI1, or Nortel NI1). The FIN must be the same for all the BRI interfaces; contact the LEC to obtain the FIN values for these features.

CACH EKTS flag allows customers to indicate which of the BRI interfaces are configured within the LEC as CACH EKTS.

CACH is one of the methods used to have BRI emulate an analog hunt. Although there is a CACH setting in the NT DMS, it does not react in the same manner; the CACH setting in the DMS does not allow the sharing of DNs. Administration of CACH values in the Hicom 150 E is referred to as CAID (Call Appearance IDentification) administration.

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