User guide

Switching SNMP Out of Band Modems
6-10 VMS User Guide
Switching SNMP Out of Band Modems
Overview
SNMP controlled modems are defined as Out-of-Band in the VMS. This means
the traffic interface for these modems is not part of the IP infrastructure the
Vipersat Network belongs to.
SNMP modems use either a serial traffic interface such as V.35 or G.703, a
bridged GiGE interface (in the case of the CDM700s) or an IP interface which is
isolated from the local area network native to the Vipersat Network (in the case
of OOB CDM570 modems in managed switch mode).
VMS communicates with SNMP modems at remote sites through a TDM/
STDMA Vipersat overlay. A sample of this topology is shown below in
figure 6-12
Figure 6-12 Sample Overlay Network
Out of Band Circuit Manager (OBCM)
One of the methods available for switching out of band modems is the OBCM.
Using the OBCM the operator can create channels with fixed modems and
channel rates. These channels can currently be manually switched as will be
illustrated below. In a future version of VMS this capability will be automated.
SNMP traps will be passed by the SNMP modem manager to the Out-of-Band
Manager to establish the predefined circuits.