CTI Products NCB/IM with Internal PSTN Modem - Manual (Page 9)

CTI Products, Inc. NCB/IM User Guide
1. Introduction 3
1. I
NTRODUCTION
W HAT IS AN NCB/IM U NIT ?
The Network Combiner NCB/IM TM Module is a wide-area router with an internal
modem for LonWorks networks. The NCB/IM unit is used in pairs to connect
L
ON W ORKS

networks real-time, spanning distances from building-wide to
worldwide. The communication channel spanning the distance between local
networks can be any analog or digitized analog channel that is capable of
carrying V.32 terbo standard modem signaling, including standard dial-up Public
Switched Telephone Network (PSTN) circuits, 2-wire or 4-wire leased lines, microwave channels, PBX
circuits, etc. Data transfer between distant networks via an NCB module pair is "live", delayed only by the
transit time through the routers and modem connections.
The NCB module uses router technology so that no custom coding or additional hardware is necessary to
seamlessly connect multiple networks across very large distances. The NCB module is self-contained, easily
configured with standard network management tools, and requires no custom programming or coding changes
in system nodes.
The NCB/IM unit contains Modem Controller and Telephone Directory objects.
Basic Application
A basic application of the NCB module is where two multi-node L ON W ORKS networks, separated by a distance
beyond the reach of conventional wired media, need to be interconnected, as in Figure 1. This distance could be
across a large building, business campus, city, etc. Using the NCB module, this interconnection is
accomplished using one NCB module local to each network site and a single voice-grade telephone circuit
connecting the two NCB modules. Additional networks can be added to this unified network by simply adding
an NCB module pair per network.
CA-80070-100
LONWORKS
NODE
LONWORKS
NODE
LONWORKS
NODE
LONWORKS
NODE
NCB
LONWORKS
NODE
LONWORKS
NODE
LONWORKS
NODE
LONWORKS
NODE
NCB
STANDARD
VOICE GRADE
CIRCUIT
BUILDING 1 BUILDING 2
Figure 1 Networks in two buildings connected with NCB modules
L ON W ORKS Network Transceivers
The local L ON W ORKS networks at different sites do not need to use the same network transceiver type. For
example, an FTT-10A network, a TPT/XF-78 network, and a PLT-22 network can all be interconnected by
using pairs of NCB modules with network transceivers matching the local network at each site.
Read this
section to learn
the general
function and
capabilities of an
NCB Router