Zhone Technologies IMACS Network Device - Manual (Page 13)

Zhone Technologies, Inc. IMACS Product Book, Version 4
March 2001 Page 9
IMACS Management Via PPP or SLIP
IMACS alarms are reported either to a local device or via an internal 2400 bps modem in a proprietary ASCII
format to a central site. Additionally, the IMACS can be optioned to use TCP/IP and encode alarms as standard
SNMP traps. One method of transmitting TCP/IP management information and SNMP traps is to activate the Serial
Line Internet Protocol (SLIP) on the DB-9 port set at 9.6 Kbps. requires that a routed network exists and has full
connectivity back to the location where the SNMP-based NMS resides. Figure 4 illustrates how terminal servers are
used to provide connectivity from the IMACS’ serial interface to the router-based network. A typical NMS scenario
is described below:
NMS
Terminal
Server
Remote Site 1
PBX CODEC
PBX CODEC
IMACS Frame Relay
Network
Router
IMACS
Terminal
Server
Router
Remote Site 2
Figure 3 - IMACS Connectivity to Terminal Servers
1. An alarm occurs in the IMACS on the left side of the diagram and an SNMP trap is sent out the serial port on
the interface card.
2. A serial port of a Terminal Server that is configured for SLIP or PPP accepts the SNMP trap and forwards it
over the Ethernet LAN.
3. The IP destination is the NMS; where it is picked up by the router for delivery to the NMS.
4. The router forwards the trap and other traffic destined for remote LANs, via its Frame Relay WAN connection.
The router is connected through the IMACS to a Frame Relay network. The Frame Relay Network delivers the
SNMP trap to the Operations Center on the right side of the diagram.
5. At the Operations Center, the IMACS, acting as a DSU/CSU, delivers traffic to the router.
6. The router places the SNMP trap onto the appropriate LAN where the NMS resides.
7. The NMS acknowledges and processes the trap. At this point an operator, noticing this new alarm, could initiate
a TELNET session back to the originating IMACS or could browse the MIBs from the NMS.