Quickstart
Overview of T1 line configuration
MAX 4000 Series Hardware Installation Guide
Preliminary November 4, 1998
3-3
Overview of T1 line configuration
Figure 3-2 illustrates incoming call routing using inband signaling. The example shows two
hunt groups: one for digital calls and one for analog calls. Each hunt group contains 12
channels. Analog callers use the phone number 555-1111 to call in and are routed to the digital
modems in slot 5. Digital callers use the phone number 555-2222, and are routed to the MAX
bridge/router module in slot 9. To set up call routing, you configure two Ch N Slot parameters
in the T1 line’s profile.
Inband signaling is less flexible than ISDN D-channel signaling, because you must preallocate
the number of T1 channels used for voice calls and for data calls. If 12 analog callers are
connected, subsequent analog callers are rejected because there are no more channels available
for analog calls, even though there are 12 unused channels in the other hunt group.
Figure 3-2. Incoming call routing using inband signaling and hunt groups
With ISDN signaling, the hunt groups overlap the T1 channels, allowing each channel to
answer either voice calls or data calls. Figure 3-3 illustrates the use of ISDN D-channel
signaling. In this example, each hunt group includes all 24 channels. Analog callers call in to
the phone number 555-1111 and are routed to the digital modems in slot 5. Digital callers call
in using the phone number 555-2222 and are routed to the MAX bridge/router module in slot
9. To route the calls, you configure the Ans# parameter in both the Modem profile and the
Ethernet Mod Config profile.
Incoming ISDN calls contain information about whether the call is an analog voice call (from a
modem) or a digital data call. The MAX can automatically route voice calls to the digital
modem card and digital calls to the bridge/router module.
