Zhone Technologies IMACS Network Device - Manual (Page 80)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 76
PRI to FXS Termination
The IMACS is used to connect calls to an analog modem rack as shown in Figure 28. This application is usually
used to terminate a mix of ISDN originated calls and analog modem originated calls to the same destination. This is
common in remote access applications where there is a need to support both existing analog modem applications and
new digital ISDN connections over the same network facility. End users can migrate as needed from analog
modems to ISDN, sharing the same facility, and maximizing utilization of network bandwidth. The IMACS
receives all calls, examines the called number and routes the analog modem calls to the FXS hunt group. ISDN data
calls are routed directly to the ISDN remote access server. This application only works for inbound calls since the
modems in the rack cannot be used to dial out through the IMACS over ISDN.