Nortel INM 4.1, Руководство по планированию

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TCP/IP Network Requirements 179 of 202
INM Release 4.1 Planning Guide PG OC 98-13 Issue 1.2
D r a f t
X.25
The X.25 protocol standard defines the interface to a Packet Data Network
(PDN), or more specifically, it defines the Data Terminal Equipment (DTE)
and Data Communications Equipment (DCE) interfaces between a
synchronous packet-mode host and a PDN. The X.25 protocol suite does not,
however, define the internal architecture of the PDN nor does it define the
PDN’s operation. An X.25 data packet network is normally used in a wide area
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 50. INM Broadband X.25 WAN Configuration
PG-0005.1
S/DMS Network
Manager
LAN router
with WAN
(X.25) access
56 Kb/sec
X terminal
X terminal
LAN router
with WAN
(X.25) access
IEEE 802.3
IEEE 802.3
IEEE 802.3
IEEE
802.3
O
P
C
O
P
C
O
P
C
O
P
C
56 Kb/sec
56 Kb/sec
56 Kb/sec
X.25 DCN