User's Manual

In addition, the encryption protocols strengthen the reliability and integrity of
communicated messages.
The encryption protocol is in accordance with NSA Suite B, namely, AES for symmetrical
key encryption and authentication, GCM for block chaining, public key-based certificates,
use of the Elliptic Curve Digital Signal Algorithm (ECDSA) for certificate verification, and
key establishment.
 Data storage capabilities
The 3M™ Dual Comm RF Monitoring Receiver unit's Random Access Memory (RAM) can
store up to 18000 events. The events are deleted from the memory after they have been
successfully transferred to the central Data Communication Computer (DCC).
Communication may be triggered by the occurrence of an alert event, and otherwise
occurs during the Receiver's scheduled call-ins or in response to upload requests from
the monitoring center.
The 3M™ Dual Comm RF Monitoring Receiver features independent monitoring
capability. The unit stores offender schedules, enabling it to differentiate between
permitted and forbidden offender absences as defined by that schedule even at times
when communication with the central monitoring stations is not possible. The unit stores
in its memory all non-violation schedule-related events until they can be uploaded.
 GPRS communication
The 3M™ Dual Comm RF Monitoring Receiver unit utilizes the most advanced
communication including GSM networks that enable GPRS (General Packet Radio
Service) communication. GPRS is an "always-online" service, which provides high-speed
data services for cellular networks. With GPRS communication you pay only for the
volume of data sent and received (usually on a monthly basis).3G support is available
 Communication prioritization policies
The 3M™ Dual Comm RF Monitoring Receiver supports both landline communication and
cellular communication, including both the GPRS and CSD protocols. Users can define
prioritization for each of these communication methods for each unit, enabling or
disabling these options as desired. Furthermore, users can define prioritization for these
options. For example, the primary method can be landline communication. When the
unit detects that the landline is unavailable, cellular GPRS communication can be used. If
GPRS is unavailable, CSD can be used to transmit event data to the central monitoring
station. This versatility ensures maximum reliability.
 Tamper recurrence mechanism
The 3M™ Dual Comm RF Monitoring Receiver detects and reports any attempt to tamper
with the unit. The Receiver can detect if the unit’s case was opened, if the unit was
moved or tilted, if the power or phone line have been removed, if the SIM card case is
opened, or if someone is accessing the officers’ configuration screens.
The respective messages are:
 Case open / Case closed
 Tilt / Receiver not in tilt
 Power failure/restored
 Phone line failure/restored
 SIM card open
 Officer menu accessed