ZETRON 2000 Series Especificaciones descargar pdf (Pagina 94)

Trunk Cards and Connections

94 025-9035AA

Figure 17: PBX Tie-trunk connection diagram

Private Branch Exchange (PABX) Ground Start Description (GS)

(also known as End-to-End Ground Start)

Some PABX systems are best interfaced to the 2000 Series Paging Terminal with a

Ground Start interface. This is a Trunk-level interface to the PABX, having the same

advantages as the PABX E&M interface described above (short access code, senderized,

etc.); it differs in the electrical interface. It uses a 2-wire connection (as opposed to the

E&M 4-wire connection) to the PABX.

Refer to Theory of Operation on page 149 for call processing flowcharts and signal

descriptions.

Dual Trunk Card Memory Upgrade

In order to run firmware version 6F7 of later in the dual trunk cards (702-9117) it may be

necessary to perform an upgrade to the trunk card in order to increase the available RAM

from 256K to 1M. This would only apply to systems already in service since new systems

would be equipped with the current version of dual trunk card at the factory.

The first indicator of whether or not the card can be upgraded at all is given by looking at

the TEST pins on the front edge of the socket (see Figure 14 on page 82). If there is only a

single row of test point pins instead of a double row, then the board is too old to upgrade

and must be replaced with a new board.

Assuming that the board passes the first test and has two rows of test points, the next thing

to check is the size of socket in U17 and the size of the IC in the socket.

Note Set JP-1 on Z-bus backplane (702-9071) rev B or later to position

“A” to set telco GND to system chassis.

*GND

Telephone

PBX

Model 2200

Paging Teminal

Trunk Card

TIP (Green)

RING (Red)

GROUND (Earth)

* = Signal not needed for loop start tie-trunk

Z-02

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 375 376

Sin comentarios

ZETRON 2000 Series Especificaciones Pagina 94