Instruction manual

HARDWARE AND SOFTWARE DETERMINATION

Cabinet Determination (DEFINITY Generic 1 and Generic 3)

DEFINITY Communications Systems G1 and G3 have a duplication option for the control cabinet

(that is, control circuits are duplicated). These systems also have an option for duplicating the

expansion cabinet (that is, a second port cabinet can be added). A DEFINITY system is ordered

according to the need for duplication, the number of ports required, and future growth expecta-

tions.

For DEFINITY systems with multi-carrier cabinet(s), the cabinet that contains the control circuits

(duplicated or unduplicated) is called the Processor Port Network (PPN). The PPN provides up

to 89 port slots. If a second cabinet is required for additional ports, the cabinet is referred to as

an Expansion Port Network (EPN).

Note: For G3r, the PPN is only supported by the multi-carrier cabinet. EPNs in G3r can

use the single-carrier cabinets.

In a DEFINITY system with single-carrier cabinet(s), the stack of one to four cabinets that

includes the control circuits is called the PPN (G1 and G3i only). The PPN also contains up to 64

port slots. If an additional stack of one to four cabinets is required, the stack is referred to as an

EPN.

G1 and G3i systems that contain both a PPN and an EPN must be connected by way of expan-

sion interface circuits located in port slots in the PPN and EPN using fiber-optic cables.

The G3r uses a Center Stage Switch (CSS) for interconnections when there are four or more port

networks (PPNs and EPNs). In this case, each port network’s TN570 Expansion Interface and

fiber module is connected by fiber-optic cable to a TN573 Switch Node Interface in a switch node.

The CSS can consist of multiple switch nodes, in which case those switch nodes are intercon-

nected by fiber-optic cables. When there are fewer than four port networks, the PPNs and EPNs

are connected in the same fashion as for G1 and G3i. You can have a CSS for fewer than four

port networks, but it is not recommended unless you anticipate expanding the system to four or

more port networks. The TN573 Switch Node Interface circuit packs are usually installed in the E

Carrier of the PPN.

Note: Although port networks can be interconnected using fiber-optic cable for G3r in the

same fashion as for G1 and G3i, it is more cost-effective and it is required, where

there are four or more port networks involved, to use the CSS.

The mixing of multi-carrier and single-carrier cabinets in an equipment configuration is allowed.

For example, a fully equipped multi-carrier PPN that requires a few additional ports can be sup-

plemented by one single-carrier EPN cabinet. Such an arrangement would be more economical

than adding a multi-carrier EPN cabinet equipped with only one carrier.