Avaya CS1000 Manual do Utilizador Página 337

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Functional description 337
If no COM ports are available, extra hardware (such as DigiBoard PC/4e
and DigiBoard PC/8e) is required to provide extra serial ports. Investigate
compatibility issues (operating system support, driver available, and so
on) and hardware requirements (memory, available slots, IRQ conflicts,
and so on) before purchasing equipment, or configuring the system.
In some cases, additional hardware is needed, for example, when
RS-232-C limitations apply (for example, at 9600 baud maximum limit of
9 metres). In some cases galvanic isolation is requested, or base-band
modems, SOPHO LAM, CISCO equipment, and so on are needed
to bridge the distance between the DECT Messenger and the alarm
system. In many cases the distance between the DECT Messenger and
the external-paging system is relatively small, so no extra hardware is
needed.
Once a link is established between eESPA and the paging system, the
eESPA handles further communications and informs eKERNEL when
relevant information is to be exchanged.
For a detailed description of the ESPA4.4.4 protocol, refer to the proposal
for serial data interface for paging equipment (Nov. 1984), reference
JMJ182/NB/12B, and ISO1745 Information processing, basic mode control
procedures for data communication systems.
Functional description
In general, eESPA is designed to provide eKERNEL with paging
information. This is carried out using a <msgrqs> message request. For
some interfaces eKERNEL must send feedback to the paging system, a
process that is handled through <msgrpy> message reply request.
Figure 82
msgrqs message request
Every <msgrqs> message belongs to a group and has a specific group ID.
A group contains one or more requests. For every message request in a
group, a data block is created. A data block consists of a header, record
Nortel Communication Server 1000
DECT Messenger Installation and Commissioning — Book 1
NN43120-301 02.01 4 June 2010
Copyright © 2003-2010 Nortel Networks. All Rights Reserved.
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