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8.10 Configuring PRI Trunks (OfficePro and OfficeCom) (for U.S. Only)

Introduction

Configuring an ISDN PRI trunk requires that customers specify the protocol type and the type of trunk group calling service supported by the ISDN provider. The Hicom 150 E also supports call-by-call service selection as the trunk group calling service (refer to Section 7.17.2).

For a complete description on configuring PRI, refer to Section C.1, Configuring a Primary Rate Interface (PRI) ISDN

8.10.1 Ordering PRI

You should be prepared to tell the PRI provider what the customer has ordered for the following parameters:

Type of span: superframe (SF) or extended superframe (ESF)
Zero code suppression (ZCS). The two methods are alternate mark inversion (AMI, which is simply referred to as ZCS in the Hicom 150 E) and binary eight zero substitution (B8ZS).
Facility-associated signaling (FAS). (The Hicom 150 E does not support non-facility-associated signaling or NFAS).
No D-channel backup (not supported by the Hicom 150 E)
Clear 64 kbps channels or restricted (56 kbps)
Echo canceling or suppression

Data support: Customers who want PRI ISDN for voice and data should order:

ESF
B8ZS
No echo canceling

Voice support: Customers who want PRI ISDN for voice only should order:

SF
AMI (ZCS)
Echo canceling

Refer to Section C.1, Configuring a Primary Rate Interface (PRI) ISDN for examples of configuring a primary rate interface and refer to Section 7.16.1 for an overview of PRI parameters.
 
For specific ISDN parameters, you may need to contact the PRI ISDN provider.  

Related Topics:

Section 7.16, U.S. ISDN (for U.S. Only), on page 7-488
Section C.1, Configuring a Primary Rate Interface (PRI) ISDN

8.10.2 Terms for Ordering and Provisioning PRI (for U.S. Only)

The following terms are used by customer premise equipment (CPE) vendors and exchange carriers for the ordering and provisioning of ISDN primary rate interface.

B-Channel Allocation Mode: The method the system uses to find an available B channel when needed (high-high or low-low). High-high mode 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-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. The mode in the system must be the opposite of that used by the CO to avoid collisions when both the CO and the Hicom 150 E Office are trying to seize a B channel.

Bit Error Rate Test (BERT): This is a test performed by a technician using an ISDN test set to determine line quality. The test process creates a loop to send and receive blocks of data and calculate discrepancies. With this test, the technician can isolate static and dropped calls caused by bad central office equipment and faulty outside plant cables.

Bonding: This is the process of combining B-channel bandwidths to increase data transfer capabilities; for example, bonding B1 (64kbps) with B2 (64kbps) would equal 128kbps.

Call-by-call service selection (CBC): Configuration parameter that allows the customer to assign different services to different channels within a trunk group (refer to Section 7.17.2).

CBC-pool: A group of facility provider offerings (such as INWATS or OUTWATS) that can be assigned to channels in a trunk group.

CBC-position: A channel that has access to a CBC-pool.

Data Format: Data can be transmitted using normal high-level data link control (HDLC) or inverted HDLC. The data format is determined by the emulation type.

Emulation Type: The frame protocol used between the system and the ISDN facility provider: 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: Parameter used to select the emulation type, zero-code suppression, and data format in the Hicom 150 E. Normal encoding is associated with ESF emulation and B8ZS zero code suppression; inverted encoding is associated with SF emulation and AMI (ZCS) zero code suppression.

Integrated Services Digital Network (ISDN): This is the digital replacement for analog, plain old telephone service (POTS). Integrated services means that all communication types (voice, data, and video) use the same type of subscriber line. ISDN is the key ingredient in the Hicom 150 E Office architecture. ISDN is popular because of its data capabilities but is also rich with telephony features never before available on analog subscriber lines. The direct inward dialing (DID) capability is a popular Hicom 150 E Office ISDN feature.

Inter-Exchange Carrier (IEC): Provider of communications channels between local facility providers. Long-distance companies are an example.

Local Exchange Carrier (LEC): Provider of communications channels between local destinations or between local destinations and inter-exchange carriers. Local telephone companies are an example.

National ISDN-2 (NI-2): This is an expanded U.S. ISDN standard that offers additional features over NI-1 (defined on page 8-25). The Hicom 150 E supports NI-2 on PRI trunks.

Protocol Type: The interface between the Hicom 150 E and the PRI provider. Protocols are different for local exchange carriers (LECs) and for inter-exchange carriers (IECs). 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 list the protocols available for each slot.

Trunk Group Calling Service: Type of service that the customer orders for each trunk group, such as INWATS, OUTWATS, or 800 service. The Hicom 150 E supports 36 types of trunk group service, including call-by-call selection.

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