Instruction manual

HARDWARE AND SOFTWARE DETERMINATION

Circuit Pack Determination

Terminals, trunks, auxiliary equipment, and customer-provided equipment (CPE) require an inter-

face (circuit pack) to be connected to the system.

Note: All circuit packs are referred to by their circuit pack numbers only. Version letters

(for example, the ‘‘B’’ in TN750B, the ‘‘C’’ in TN464C) are not included. Assume the

latest version is to be used for all circuit packs.

Any customer-provided equipment that is not FCC-registered requires a 36A Coupler (for music)

or 278A adapter (for paging) and a 2012D Transformer. This enables a customer to connect an

external music or paging system to the switch where the interface may not match exactly.

Determine the types and quantities of circuit packs on the following worksheets, and enter the

totals in Table M. Information required in these worksheets may be obtained from the tables pre-

viously filled out in this manual. For a detailed description of the system’s circuit packs, see

DEFINITY



Communications System Generic 3—System Description,

555-230-200.

For a G3i, two memory circuit packs are required for simplex systems and four for duplex sys-

tems (PEC 63526). For a G3r, the quantity is predetermined at two memory circuit packs, so no

planning is required.

For G3i CallVisor ASAI, one packet control circuit pack (PEC 63533) and one ISDN-BRI circuit

pack (PEC 65512) are required for a simplex system. If duplicated with CallVisor ASAI, two

packet control circuit packs plus one TN771 Maintenance circuit pack (PEC 65524) per port net-

work are required.

For G3r CallVisor ASAI, the packet control circuit pack(s) and, for duplicated systems, mainte-

nance circuit pack are already included in the configuration, so the only circuit pack required from

planning is one ISDN-BRI circuit pack (PEC 65512).

In G1 and G3i configurations, port networks are connected directly to each other. In G3r, where

there are four or more port networks, they are connected to the TN573 Switch Node Interface cir-

cuit pack, with one TN573 for each port network. The TN573 circuit packs are located in a switch

node carrier, usually the PPN, E Carrier. This configuration, called the Center Stage Switch

(CSS), reduces the amount of connections needed between port networks. You can have a CSS

for fewer than four port networks, but it is not recommended unless you anticipate expanding to

four or more port networks.

Each G3r cabinet, including the PPN that contains the CSS, requires an Expansion Interface

TN570. Only the CSS in the PPN contains a Switch Node Interface TN573 and Switch Node

Clock TN572. If one of the cabinets is remoted, both ends of the connection require a DS1 Con-

verter TN574. The TN776 Expansion Interface circuit pack cannot be used for the G3r CSS.

Note also that the TN776 Expansion Interface circuit pack is required with ISDN-BRI in the G3i,

but cannot be used at all in the G3r. The Expansion Interface circuit pack for the G3r is the

TN570.