3Com REMOTE ACCESS SYSTEM 1500, Management Manual

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266 C
HAPTER
17: PPP O
VER
S
ERIAL
WAN P
ORT
Figure 23 shows a typical PPP over leased line setup.
Figure 23 Typical PPP over leased line setup
The RAS 1500 supports the following protocols through the WAN port.
There are no settings on the RAS 1500, a different cable is used for each
protocol.
■
V.35
■
RS-232E (V.28)
■
RS-422 (V.11, X.21)
■
RS-449 (V.11, V.10)
■
EIA-530 (V.11, V.10)
■
EIA-530A (V.11, V.10)
Case Study
Before You Begin Before you configure the RAS 1500 for PPP over leased line, do the
following:
1 Work with the phone company to acquire a leased line between the two
sites.
2 The leased line attaches to the Channel Service Unit/Data Service Unit
(CSU/DSU) at both customer sites.
3 The leased line is responsible for providing a clock, either through the
Central Office or through the CSU/DSU.
R A S 1 5 0 0
L A N
local LAN users
R A S 1 5 0 0
L A N
local LAN users
P S T N
leased line