6-10
MAX 3000 Installation and Basic Configuration Guide
Quickstart
Configuring WAN lines
T1/PRI line configuration
You can configure T1/PRI lines to use ISDN PRI D-channel signaling or inband signaling. Ask
your carrier which signaling types are available. ISDN signaling might be more expensive than
inband signaling, or unavailable, in some locations.
When you have determined which signaling type is appropriate for your WAN, gather the
necessary information, then proceed with the configuration.
ISDN signaling
With ISDN signaling, incoming calls contain information about whether the call is an analog
call (from a modem) or a digital data call. The MAX automatically routes analog calls to the
digital modem card and digital calls to the Ethernet module.
In the example illustrated in Figure 6-2, analog callers calling into the telephone number
555-1111 are routed to the digital modems in slot 7. Digital callers using the same telephone
number are routed to the Ethernet module in slot 4.
Figure 6-2. Incoming call routing using ISDN T1/PRI signaling
Inband signaling
With inband signaling, you must configure incoming call routing by assigning channel
numbers to slots. You have to preallocate the number of T1 channels used for analog calls and
for data calls. A disadvantage of using inband signaling is that if you have, for example,
allocated 12 channels to analog calls and 12 channels to digital calls, only 12 calls of one type
can be connected. If 12 analog calls are connected, any additional analog calls are rejected,
even if no digital callers are connected.
CH 1
CH 2
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CH 23
CH 24
Digital modem card
(slot 7)
Ethernet module
(slot 4)
WAN
555-1111
555-1111
Net /T1 module
