Cabletron Systems Netlink FRX8000, User Manual

Page: 91 / 468

Configuring Inter-Nodal Trunks 7-11
INI String
will be sent verbatim to the modem during initialization. It is intended to contain spe-
cific information that will be read by the modem (configuration, operation, etc.).
Do not include the string
AT*V3
, as this is sent by the node later.
Sending it too soon will lock up the LP and cause this procedure
to miss a step.
Initializing a Modem
Here is the normal sequence for initialization of a V.25bis modem:
1. After receiving a Port Enable from the FRX8000 software, DTR will be asserted
on the port.
2. If the modem is powered on and in AT mode, it will return CTS.
3. The node will send the modem initialization string.
4. The modem should return an OK or an error.
5. If the node receives an OK, it will send the string AT*V3, which will put the
modem into V.25bis synchronous mode.
If the node does not receive an OK, it will assume the modem is already in V.25
mode. The node will then send a message to reset the modem to AT mode, and
will repeat steps 3–5 of this procedure, up to the number of times specified for
Line Setup Retries
in the Port record. (See page 7-8.)
If the modem still does respond, it will be put into
Failed
state.
Configuring N74/7500 PDN Ports
N74/7500 ports configured as PDN support logical trunk connections over a public
data network to other N74/7500s and to FRX8000 Switches (via logical X.25 trunk
ports on FRX8000). To configure an N74/7500 port as PDN, you must configure two
records: one for the physical port (unless it already exists) and one for the logical port
that will reside on the physical port and will be the logical trunk.
Press
[A]
, then
[C]
from the Ports Selection Menu (or
[A], [D], [A], [C]
from the
Main Menu). When prompted, enter:
●
Node ID
(of the node containing the port):
1–250
. (Default is the “local” node.)
●
LP ID
(of the LP containing the port):
0–7
. (Default is
0
.)
●
Port
:
0–7
for a physical port on an RLP,
0–3
for a port on an AST LP (N74/7500
only),
8–63
for a logical port. (If you specify a logical port, enter the number of
the associated physical PDN port when asked.
Up to eight logical ports can be configured on a physical PDN port.
●
Any other requested information, noting the values in Table 7-3 . (Press
[Enter]
at a prompt to specify the default value.)