Nortel Networks NTNM13XKAB Instrukcja Użytkownika Pobierz pdf (Strona 37)

TCP/IP Network Requirements 5-3

Network Wide Backup & Restore Planning Guide Rel 1.0 Standard July 1999

network for data communications to remote sites. For more information please

see Mark A. Miller, Internetworking: A Guide to Network Communications,

MT&T Books, 1991.

Figure 5-2

INM Broadband X.25 WAN Configuration

PG-0005.1

WAN requirements

The requirement for the wide area network is to provide ports to the INM

Broadband at 56 Kbit/s and to the OPC modules at 19.2 Kbit/s

The definition of a Wide Area Network (WAN) is a network that ties together

users or networks of users which are widely separated geographically.

Typically, a WAN will use public or private telecommunications facilities,

such as X.25 or T1, to provide the link between its users. If the primary

functions of the INM Broadband are surveillance and provisioning, then X.25

or sub-DS0 line rates will be sufficient for the WAN, shown in Figure 5-2 on

page 3. If the INM Broadband is to be used in a software delivery function,

then sub-rate T1 or T1 links are recommended as shown in Figure 5-3 on

page 4.

S/DMS Network

Manager

LAN router

with WAN

(X.25) access

56 Kb/sec

X terminal

LAN router

with WAN

(X.25) access

IEEE 802.3

IEEE

802.3

56 Kb/sec

X.25 DCN

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