Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 368)

Switching Out-of-Band Modems MN/22156, rev 12
7-12 VMS User Guide
Switching 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
(CDM-600Ls), a bridged Gig-E interface (CDM-700s), or an IP interface which
is isolated from the local area network native to the Vipersat network
(CDM-570/L OOB modems in managed switch mode).
Out-of-Band circuits can be managed via an overlay Vipersat network—requir-
ing two satellite modems at each Remote site, as shown in figure 7-9—or via
any IP infrastructure that is available covering both ends of the satellite link.
Figure 7-9 Vipersat Overlay Network example
The management and control commands from the VMS are transmitted and
received InBand by the CDM-570L circuit. These commands are then routed by
the CDM-570L over Ethernet to the CDM-600L modem. Since the management
and control signals are handled by the CDM-570L within its allocated band-
width and do not occupy any of the CDM-600L’s bandwidth, these command
ciruits are considered Out-of-Band with respect to the CDM-600L circuit.