On a network composed solely of SNMP devices, you would only need a simple SNMP management platform. You could see all of your alarms on just one screen. A human operator managing the network would make all management decisions related to the incoming SNMP traps, determining which alarms must be attended to and which must be distributed to technicians.
The problem with this SNMP management scenario is that it is unrealistic. Telecom networks evolve over time, and SNMP traps almost certainly aren't the only alarm messages you need to collect.
When all your equipment does not utilize SNMP management, additional protocol management applications and systems will be required. For each additional protocol used by a network device, an additional management application will be necessary to interpret different kinds of messages. This may even create the need to hire and train additional operators.
This is a vast improvement over inferior SNMP management applications, which simply list all alarm and clear change-of-state (COS) events in a list. T/Mon LNX even supports legacy devices and propriety protocols from manufacturers such as iReasoning, IBM, ">Nortel, Alcatel, HP,APC InfrastruXure, and Castle Rock.