Comtech EF Data SNM-1010L - Manual (Page 23)

SNM-1010L Data/Control Modem Revision 0
Introduction MN/SNM1010L.OM
1.1.2 Description
Figure 1-3. SNM-1010L Control/Traffic Mode
The SNM-1010L (Figure 1-3) functions as a self-contained indoor unit (IDU) for sites
that require a single data circuit on-demand. When coupled with a Block Up Converter
(BUC), Low-Noise Block Converter (LNB), and an antenna, it provides an Earth Station
configuration. Operating under the Network Management System (NMS) control, it
provides Control and Traffic modes, switching between the two modes as required. In the
control mode, the SNM-1010L provides the interface to the NMS.
The modulator, operating in Burst mode, is tuned to the inbound control channel and the
demodulator, operating in the Continuous mode, is tuned to the outbound channel. Under
NMS control, the SNM-1010L performs circuit setup and termination, local M&C,
diagnostics, and reports call detail records. This mode of operation is known as Control
Mode.
To transmit or receive a call, the SNM-1010L switches to the traffic mode. While
carrying user traffic, the modem operates in Continuous TX and RX modes, and is
capable of supporting data rates up to 5.0 Mbps. Once the traffic connection is
terminated, the modem automatically reconfigures and reverts back to control mode.
The user port interface can be used to request services from the NMS. It also can be used
for TX and RX service terminal messages, installation, and diagnostics, as well as
software upgrades.
1.1.2.1 User Port
The user port interface allows the user to configure the modem and to request
establishment and termination of data circuits.
The user port is also used for software upgrades. User port commands are available to
change the user port to a maintenance (service) port and vice-versa. The power ON
default functionality is that of user port.
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