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3000 Series User Guide 21
Connecting to a PPP WAN
To connect the WAN module to a PPP WAN,
1. Connect the module to an external modem.
Note: The 3000 Series support both asynchronous and synchronous
modems.
2. Connect the modem to the telephone line with an RJ-11 cable.
Connecting to a Frame Relay WAN
To connect the WAN module to a Frame Relay WAN,
1. Connect the module to an external Channel Service Unit/Digital Service
Unit (CSU/DSU).
You can purchase the appropriate cable from N
x
Networks. See Selecting
a WAN Cable on page 18.
Note: The 3000 Series works with any of the major CSU/DSU products
on the market.
3000 Series
Modem
PSTN
(PSTN = Public Switched Telephone Network)
3000 Series
VO
IC
E
OICE
V
1
V1
D
1
D1
D
2
D2
D
3
D3
E
T
H
ETH
V
2
V2
V
3
V3
V
4
V4
DATA
A
L
M
ALM
O
K
OK
P
W
R
PWR
Internet or
Other WAN
Modem
Internet
Service
Provider