Operation
M7/M7L/M7LT Modular Satellite Modem
1-18
M7/M7L/M7LT - Rev. 0.05
1.5.3.5.
High Speed Serial Interface (HSSI) (H7)
The installation of the optional High Speed Serial Interface or HSSI Card (Figure 1-15) provides the
M7 modems with a high speed synchronous serial interface designed for higher data rates than are
possible with standard serial interface protocols like V.35, RS-449 and EIA530. This optional Interface
card is designed to be installed inside the main modem assembly in the option interface position. It
can be installed alone or as a second interface option within the modem.
Figure 1-15 - HSSI Interface
HSSI is an industry standard interface type that is usually associated with connection to routers, such
as the Cisco 3600 series, for higher data rates on WAN links. The standard itself describes
communications at up to 52 Mbps over cable lengths up to 50 feet. Since the M7 series of modems is
capable of up rates >52 Mbps, this optional interface allows full utilization of the M7 capabilities.
1.5.3.6.
Dual Interface Configuration
The M7 allows for up to two (2) interface modules to be installed in the modem. The M7 controller will
recognize the installed interfaces and provide the appropriate functions on the control and monitor
interfaces. Below are some examples showing the rear panel view of dual interface configurations.
The combination of the Advanced IP Interface (I7) and the Multi-protocol Synchronous Serial Data
interface (S7) is shown in Figure 1-16. The combination of the Advanced IP Interface (I7) and the
Dual G.703/E1 Interface (G7) is shown in Figure 1-17. The combination of the Express Ethernet
Interface (E7) and the Dual G.703/E1 Interface (G7) is shown in Figure 1-18.
Figure 1-16 - Dual Interface Configuration I7 and S7
