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13.2.1 |
PRI |
Introduction |
| The HiPath 3800, HiPath 3500, HiPath 3550 and 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 HiPath 3550 and HiPath 3500 support 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. HiPath 3550 and HiPath 3500 support 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 |
| 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 HiPath 3800, HiPath 3500, HiPath 3550 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 HiPath 3000 systems support seven commonly used LEC protocols and seven commonly used IEC protocols. Table 13-1 and Table 13-2 show the protocols available for each slot. |
LEC Protocols |
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IEC Protocols |
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| 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. HiPath 3550 and HiPath 3500 automatically set 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 HiPath 3000 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 HiPath 3550, HiPath 3350, HiPath 3500 and HiPath 3300 support 36 types of trunk group service. Customers select the type of service according to the service ordered from the ISDN provider. |
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| The following tables outline the voice and data services available through the public network providers in the North American market. |
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| HiPath 3000/5000 V9, Feature Description, Issue 10 | up  |
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| Disclaimer & Copyright | ID: P31003H3590F100017618 | 2014-02-27 |