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Table 22: USB Modem Terminology
DefinitionTerm
Telephone number of the caller on the remote end of a USB modem
connection, used to dial in and also to identify the caller. Multiple caller
IDs can be configured on a dialer interface. During dial-in, the router
matches the incoming call's caller ID against the caller IDs configured
on its dialer interfaces. Each dialer interface accepts calls from only
callers whose caller IDs are configured on it.
caller ID
Logical interface for configuring dialing properties for a USB modem
connection.
dialer interface (dl)
Feature that enables J-series Services Routers to receive calls from the
remote end of a USB modem connection. The remote end of the USB
modem call might be a service provider, a corporate central location,
or a customer premises equipment (CPE) branch office. All incoming
calls can be verified against caller IDs configured on the router's dialer
interface.
dial-in
Protocol that provides error correction and data compression for
asynchronous modem transmission.
Microcom Networking Protocol (MNP)
USB Modem Overview
A USB modem connects to a Services Router through modem interfaces that you
configure. The router applies its own modem AT commands to initialize the attached
modem. Modem setup requires that you connect and configure the USB modem at
the router and the modem at the user end of the network.
■ USB Modem Interfaces on page 30
■ How a Services Router Initializes USB Modems on page 31
■ USB Modem Connection and Configuration Overview on page 32
USB Modem Interfaces
You configure two types of interfaces for USB modem connectivity: a physical
interface and a logical interface called the dialer interface:
■
The USB modem physical interface uses the naming convention umd0. The
Services Router creates this interface when a USB modem is connected to the
USB port.
■
The dialer interface, dln, is a logical interface for configuring dialing properties
for USB modem connections.
See the interface naming conventions in the J-series Services Router Basic LAN and
WAN Access Configuration Guide.
The following rules apply when you configure dialer interfaces for USB modem
connections:
30 ■ USB Modem Overview
J-series™ Services Router Administration Guide