Secure, Long Range IP/Ethernet & Serial Covering Subscriber, Base, and Outdoor units (ODUs) of the Mercury 16E Series Installation and Operation Guide Technical Manual MDS Mercury Series MDS 05-6302A01, Rev. B.
Need Quick-Start instructions for this product? Please refer to publication 05-6301A01. All GE MDS user guides are available online at www.gemds.
TABLE OF CONTENTS 1.0 PRODUCT DESCRIPTION................................................................................................... 1 1.1 Product Models ............................................................................................................................. 2 1.2 Key Features ................................................................................................................................. 2 1.3 Key Specifications ..................................................
User Accounts................................................................................................................................ 31 4.3 RADIUS Server Configuration ..................................................................................................... 32 Creation of X.509 Certificates ........................................................................................................ 33 Load X.509 Certificates....................................................................
Supported SNMP MIBs.................................................................................................................. 58 Accessories list .............................................................................................................................. 58 APPENDIX B—Glossary of Terms and Abbreviations ................................................................
L'énergie concentrée en provenance d'une antenne directionnelle peut présenter un danger pour la santé. Ne pas permettre aux gens de s'approcher à moins de 25 cm à l'avant de l'antenne lorsque l'émetteur est en opération. On doit augmenter la distance proportionnellement si on utilise des antennes ayant un gain plus élevé. Ce guide est destiné à être utilisé par un installateur professionnel. Plus d'informations sur l'exposition aux rayons RF peut être consulté en ligne à l'adresse suivante: www.fcc.
Environmental Information The manufacture of this equipment has required the extraction and use of natural resources. Improper disposal may contaminate the environment and present a health risk due to hazardous substances contained within. Toavoid dissemination of these substances into our environment, and to limit the demand on natural resources, we encourage you to use the appropriate recycling systems for disposal.
vi MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev.
1.0 PRODUCT DESCRIPTION The GE MDS Mercury SeriesTM transceiver is an easy-to-install WiMAX solution offering extended range, secure operation, and multi-megabit performance in a compact and rugged package. Mercury is ideally suited for applications in Smart Grid Electric Utility, Oil/Gas, Water/Wastewater, and other industrial uses in fixed location environments where reliability, security, throughput, and range are paramount. Figure 1.
1.1 Product Models The Mercury transceiver is available in several different product models: • The indoor Base Station (BS) acts as the center of each point-to-multipoint network. It has two RJ-45 Ethernet ports and a DB-9 RS-232 serial port for data connections. • The indoor Subscriber Unit (SU) acts as one of the multipoints in the network. It also has twoRJ-45 Ethernet ports and a DB-9 RS-232 serial port for data connections.
• Adaptive modulation from QPSK with 1/2-rate FEC coding to 64-QAM with 5/6-rate coding • Quality of Service (QoS) including: • Unsolicited Grant Service (UGS), • Real-time polling service (RTPS), • Non-real-time polling service (nRTPS) • Enhanced real-time polling service (eRTPS) • Best Effort (BE) 1.3 Key Specifications Table 2 lists key operational specifications for the Mercury Transceiver. Table 2. Key Specifications MDS 05-6302A01, Rev. A Primary Wireless IEEE 802.
Table 2.
Invisible place holder Figure 2. Mercury Summary Page Example (Shows connection after IP address has been changed) 2.2 Configure IP Address and Identity The IP Address of the unit is configured on the Configuration - IP & Networking page. The IP address and netmask should be set according to the network configuration defined by the system administrator. Note that if the IP address is changed, the web browser session will need to be re-started with the new configuration. MDS 05-6302A01, Rev.
Invisible place holder Figure 3. Mercury Configuration Screen In addition to the IP address, the unit can be configured with an optional Device Name for ease of administration. The name can be set on the Configuration - Identity & Time page. Invisible place holder Figure 4. Mercury Configuration —Identity & Time 6 MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev.
2.3 Basic Connectivity To establish basic connectivity betweena Base Station and a Subscriber, start the configuration with the BaseStation. The IP address and Device Name will be as set from the factory (or by the previous user). The Configuration - Radio page contains the key parameters for configuring the WiMAX interface. Invisible place holder Figure 5. Mercury Configuration—Radio The frequency defaults to 3662.5 MHz and the bandwidth is set to 3.5 MHz.
Invisible place holder Figure 6. Benchtop Test Setup Use the Maintenance & Status - Performance page on the Subscriber to monitor the establishment of the link. Invisible place holder Figure 7. Maintenance and Status Screen The Wireless Network Status will display a Connection Status of OPERATIONAL when the Subscriber is successfully linked to the Base Station. The WiMAX RadioStatus pane displays the signal strength and quality. For a cabled, benchtop test, an RSSI of -70 dBm is acceptable.
Setup for Maximum Throughput To demonstrate maximum throughput, several configuration changes must be made. In addition, the link needs to be cabled according to Figure 6, with a strong signal, that is, above -70dBm. If necessary, the link attenuation should be adjusted to reach the desired RSSI level. The transmit power of the Base Station should be reduced to 10 dBm to ensure that the Subscriber only receives the signal through the cables and not directly from enclosure to enclosure.
Authentication. User authentication allows a device to ensure that a user may access the device's configuration and services. Device authentication allows a network serverto verify that a device may access the network. User Authentication The Mercury transceiver requires user login with an account and password in order to access the Device Manager.
The Subscriber must be configured with X.509 certificates that are appropriate for the Public Key Infrastructure (PKI) in which they are deployed. These certificates are used to identify and authenticate the Subscriber to the RADIUS sever. X.509 Certificates A digital certificate, often known as an X.509 certificate, is a file that contains identification data and asymmetric key material. Each certificate contains a Common Name that identifies the user or device that owns the certificate.
3.3 ARQ and Hybrid ARQ Automatic Retransmission Request (ARQ) enables retransmission of erroneous or lost data packets. Hybrid ARQ (HARQ) combines forward error correction with ARQ retransmissions to improve performance at lower RF signal levels. With ARQ, the receiver discards erroneous packets and requests retransmission. With HARQ, erroneous packets are saved by the receiver and combined with the retransmitted data. Generally, HARQ provides better throughput than ARQ.
Invisible place holder Figure 8. Configuration—Radio (ARQ/HARQ Settings) HARQ Setup A HARQ Category may be set on the Subscriber. Higher category numbers provide a higher number of HARQ channels and more bursts per frame. Therefore, the greatestthroughput will be obtained at HARQ category 4. For more information on HARQ categories, refer to the WiMAX Forum Protocol Implementation Conformance Statement (PICS), or the IEEE-802.16 Standard, OFDMA Parameters.
Invisible place holder Figure 9. Configuration—Radio (HARQ Category Setting) 4.0 Performing Common Tasks 4.1 Basic Device Management There are several ways to configure and monitor the Mercury transceiver. The most common method is to use a web browser to connect to the device's HTTP server. This can be done by opening a web browser and entering the Mercury's IPaddress. Another way to connect, especially if the IP address is unknown, is to use the USB interface.
Start>>Control Panel>>System>>Hardware>>Device Manager Next, expand the group labeled Ports (COM & LPT). A new COM port will appear as Gadget Serial when the device is connected. Open a new sess ion for the newly added COM port using a terminal program such as PuTTY, HyperTerminal, ProComm, etc. Note that the baud rate will be ignored as this is not an actual serial port. Using Configuration Scripts Configuration scripts can be used to save, restore, and copy configurations from unit to unit.
Invisible place holder Figure 10. Maintenance & Status—Configuration Files Perform Firmware Upgrade New firmware is periodically released by GE MDS to deliver new features and performance enhancements. The latest firmware can be downloaded from the GE MDS website at www.gemds.com. There are several ways to load new firmware on the Mercury transceiver. The firmware file can be transferred using FTP, SFTP, TFTP, or a USB flash drive.
6. If the FTP server does not support an anonymous user, enter the username and password for an account on the FTP server. 7. Press the Program button and wait for the file transfer to complete. Instructions for loading firmware using a USB flash drive 1. Download the .mpk firmware file from GE MDS 2. Place the .mpk firmware file on USB flash drive that is formatted for use by Microsoft Windows (FAT32 format). 3. Navigate to the Maintenance & Status - Firmware Utilities page on the Mercury transceiver. 4.
Invisible place holder Figure 11. Maintenance & Status—Firmware Utilities Screen Configuring Networking Features for VLAN The Mercury supports IEEE 802.1Q, or VLAN tagging. VLANs, or Virtual LANs, are used to create multiple logical networks that share an existing physical network. There are a number of parameters available for configuring how the transceiversbehave when VLAN is enabled and they are explained below.
The Serial VLAN IP address allowsSCADA networks to connect to the Serial Terminal Server on the transceiver. The terminal server provides access to the transceiver's local COM port so IP networks can utilize serial devices. The terminal server is only available through the Serial VLAN IP address while VLAN is enabled. The Serial VLAN IP Address settings are configured under the Serial VLAN Subnet Config Menu or the Serial VLAN IP Address section on the web page.
The following is an example configuration that has a VLAN enabled network connected to the Base Station and a non-VLAN enabled network connected to the Subscriber. This configuration would allow VLAN enabled devices in the Base Station network to communicate with non-VLAN devices in the Subscriber network. The Base Station is configured as follows: Figure 12. Base Station Configuration Settings The Subscriber Unit is configured as follows: 20 MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev.
Invisible place holder Figure 13. Subscriber Unit Configuration Settings Configure Serial Data Interface for TCP, UDP, MODBUS Overview The transceiver includes an embedded serial device server that provides transparent encapsulation of serial data in IP packets. In this capacity, it acts as a gateway between serial and network-based devices.
Dual Purpose Capability The transceiver's COM1 serial port is able to function as a local console or in data encapsulation mode. When the Com 1 Status parameter is set to Enabled, the port operates in data encapsulation mode. It can be reverted back to console mode by entering the escape sequence +++ at the data mode baud rate. TCP and UDP Encapsulation The serial data can be encapsulated in either TCP or UDP packets.
The transceiver keeps a TCP session open until internal timers that monitor traffic expire. Once a TCP session is closed, it must be opened again before traffic can flow. The timeout period, labeled TCP Keepalive, is user-configurable and should be set to match the application data flow and balance a trade-off between responsiveness and connection overhead. TCP connection establishment can introduce a slight delay to data delivery, as it performs handshaking between the client and server.
Invisible place holder Figure 14. Setup Wizards—Serial Configuration To begin the Serial Wizard, click the Begin Wizard link under the Serial Wizard table. The wizard prompts for the protocol to configure. The options are TCP, UDP, or TCP/MODBUS. Example: TCP Server The following procedure describes how to setup a TCP Server. 1. Select TCP as the IP protocol. 2. Select the desired TCP mode - client or server or client/server. 3. Next, specify the local port to use for receiving TCP data from the host.
6. The current settings are shown. Click Commit Changes to apply all settings and exit the Serial Wizard. Invisible place holder Figure 15. Serial Wizard's Commit Changes Screen Configure QOS Quality of service is configured on the Base Station through the use of service flows. The service flows can be created through the web interface and through the use of QoS configuration scripts. The web interface displays the active service flows as well the user-configured flows.
Service Types WiMAX provides five types of service: Unsolicited Grant Service (UGS), Real-time Polling Service (RTPS), Non-real time polling Service (nRTPS), Enhanced Real-time Polling Service (eRTPS), and Best Effort (BE). The characteristics and typical uses for service type are given in Table 4 below. Table 4. Service Types and Characteristics Service Type Characteristics Typical Uses Unsolicited Grant Service (UGS) The BS grants bandwidth to the SU without it needing to make a request.
Table 6 provides a description for each of the above parameters. Table 6. Parameter Descriptions Parameter Description Min Reserved Rate The minimum rate in bits per second that must be reserved for the service flow. For UGS, the Min Reserved Rate is set to the same value as the Max Sustained Rate. Max Sustained Rate The maximum rate in bits per second that the service flow will increase to. It is used as an upper bound for the flow.
Creating a Service Flow The Add New Service Flow button allows for a new service flow to be created and configured. Pressing this button displays the following dialog box. Invisible place holder Figure 17. Configuration QoS Screen QOS Example: Low Latency To create a service flow providing consistent low latency, the UGS service type should be used. The grant interval should be set to match the desired latency.
QOS Example: Prioritizing a Data Flow In order to prioritize one traffic flow over another, the service flow priority should be used. In this example, there are two VLANs on the trunk at the Base Station. Suppose the user wants to treat traffic on VLAN 5 as higher priority than traffic on VLAN 6 in the event of heavy network traffic or congestion. To accomplish this, uplink and downlink service flows are created that classify on VLAN ID, assigning a higher priority to VLAN 5's service flows.
The dialog box in Figure 19 below shows the uplink service flow for VLAN 6. Figure 19. Edit Service Flow Screen (VLAN 6) Once configured, the list of provisioned service flows appears similar to that shown in Figure 20 below. Figure 20. Manage Provisioned Service Flows 30 MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev.
4.2 CONFIGURE SECURITY FEATURES & INTEGRATION WITH A RADIUS SERVER Device Management Interface Configuration Using the Configuration - Security page, each of the device management interfaces (HTTP, SNMP, SSH, telnet) can be enabled or disabled. For secure installations, it is recommended that 1) the Telnet interface be disabled, 2) the SNMP agent run in SNMPv3 mode, 3) the web server be configured for HTTPS with MD5 digest.
4.3 RADIUS Server Configuration Using the Configuration - Security page, each Mercury transceiver can be configured with one or two IP addresses for RADIUS servers. The RADIUS server is used for user authentication and device authentication. The IP address, port, shared secret, and authentication protocol can be configured for each RADIUS server. If two servers are configured, the device will use the first server for authentication processes.
Creation of X.509 Certificates Each transceiver can be loaded with a set of X.509 digital certificates in DER format. These certificates are used in the authentication process when joining a WiMAX network. The certificates can be loaded using TFTP, FTP, or SFTP, as described below. Three certificates are supported: Root CA (Certificate Authority), the Device's public certificate, the Device's Private Key. The Common Name (CN) for the certificate must be the serial number for the Mercury transceiver.
Configure SNMPV3 Overview The Mercury transceiver supports SNMP protocol version 3. Version 3 brings a higher level of security toSNMP transactions by requiring user account name and password authentication as well as encryption of SNMP packets. The following section describes how SNMPv3 is implemented on the transceiver and how to configure it for integration with PulseNET and other network management system software. SNMPV3 SUPPORT The updated SNMP Agent now supports SNMP version 3 (SNMPv3).
Passwords can be changed either locally (via the console) or from an SNMP Manager, depending on how the Agent is configured. If passwords are configured and managed locally, they are non-volatile and will survive a power-cycle. If passwords are configured from an SNMP manager, they will be reset towhatever has been stored for local management on power-cycle. This behavior was chosen based on RFC specifications.
• Passwords are currently managed locally. The local passwords are Fairport (Auth) and Churchville (Priv). Configuration is changed to handle the passwords from the Manager. The Manager changes the passwords to Brighton (Auth) and Perinton (Priv). The radio is then rebooted. After a power-cycle, the radio uses the passwords stored in flash memory, which are Fairport (Auth) and Churchville (Priv). The Manager must be re-configured to use these new passwords. 4.
GPS LINK (Base Station) LINK (Subscriber) USB ON Internal GPS receiver is synchronized to satellite network Blinking Base station is synchronizing internal clock to satellite timing Internal GPS receiver is not synchronized The Base Station is operational and transmitting The Base Station is not transmitting The Subscriber is linked to a Base Station The Subscriber is scanning The Subscriber is not linked to a Base Station USB activity on Host port No USB activity OFF ON OFF ON Blinking slow OFF ON OF
An Ethernet port at the Base Station or Subscriber may be disconnected or disabled. The Base Station or Subscriber may be misconfigured in regard to VLAN and VLAN trunk port settings. The IP addressing of the source and destination devices may be mismatched. Weak or poor quality signal at Subscriber The Base Station transmit power may be set too low. Check the gain and loss in the antenna system and cabling to determine the maximum allowable transmit power. The antenna(s) may be misaligned.
6.1 General Requirements There are three main requirements for installing a transceiver—adequate and stable primary power, a good antenna system, and the correct interface between the transceiver and the data device. Figure 22 shows a typical Subscriber Unit installation. NOTE: The network port supports 10BaseT connections, but does not support 100BaseT connections. This should not present a problem as most hubs/switches auto-switch between 10BaseT and 100BaseT connections.
Mounting Considerations The unit is normally supplied with brackets for mounting to any flat surface. If possible, choose a mounting location that provides easy access to the connectors on the end of the radio and an unobstructed view of the LED status indicators. DIN Rail Mounting Option The unit may also be mounted with an optional 35mm DIN Rail Mounting Bracket (Part No. 03-4022A06). Equipment cabinets and racks of recent design often employ this type of mounting.
formance. If you are not familiar with the effects of terrain and other obstructions on radio transmission, the discussion below will provide helpful background. 6.3 Equipment Grounding To minimize the chance of damage to the transceiver and connected equipment, a safety ground (NEC Class 2 compliant) is recommended which bonds the antenna system, transceiver, power supply, and connected data equipment to asingle-point ground, keepingall ground leads as short as possible.
Table 6-1. LAN Port (IP/Ethernet) Pin Functions Ref. 3 Receive Data (RX) High 4 Unused 5 Unused 6 Receive Data (RX) 7 Unused 8 Unused Low 6.5 COM1 Port To connect a PC to the transceiver’sCOM1 port use a DB-9M to DB-9F “straight-through” cable. These cables are available commercially, or may be constructed using the pinout information in Figure 6-1 and Table 6-1. 5 9 1 6 Figure 6-1. COM1 Port (DCE) (Viewed from the outside of the unit.) Table 6-1.
Antennas The equipment can be used with a number of antennas. The exact style used depends on the physical size and layout of a system. Contact your factory representative for specific recommendations on antenna types and hardware sources. In general, a sector type antenna is used at the Base Station site. This provides equal coverage to all of the Subscriber sites.
Table 6-1. Length vs. Loss in Coaxial Cables at 1800 MHz Cable Type 10 Feet (3.05 m) 50 Feet (15.24 m) 100 Feet (30.48 m) 500 Feet (152.4 m) RG-214 1.52 dB 7.6 dB Unacceptable Loss Unacceptable Loss LMR-400 0.78 dB 3.9 dB 7.8 dB Unacceptable Loss 1/2 inch HELIAX 0.46 dB 2.3 dB 4.58 dB Unacceptable Loss 7/8 inch HELIAX 0.26 dB 1.28 dB 2.56 dB Unacceptable Loss 1-1/4 inch HELIAX 0.20 dB 0.96 dB 1.9 dB 9.5 dB 1-5/8 inch HELIAX 0.16 dB 0.8 dB 1.6 dB 8.
RSSI value. (See “Antenna Heading Optimization” on Page 46 for details.) If adequate signal strength cannot be obtained, it may be necessary to mount the station antennas higher, use higher gain antennas, select a different site or consider installing a repeater station. 6.8 A Word About Radio Interference The transceiver shares the RF spectrum with other services and devices.
Transmitter Power Output and Antenna System SWR Introduction A proper impedance match between the transceiver and the antenna system is important. It ensures themaximum signal transfer between the radio and antenna. The impedance match can be checked indirectly by measuring the SWR (Standing Wave Ratio)of the antenna system. If the results are normal, record them for comparison for use during future routine preventative maintenance.
the received signal strength. The transceiver has a built-in received signal strength indicator (RSSI) that can be used to tell you when the antenna is in a position that provides the optimum received signal. RSSI measurements and Wireless Packet Statistics are based on multiple samples over a period of several seconds. The average of these measurements will be displayed by the Management System. The path to the Management System menu item is shown in bold text below each step of the procedure.
dBm V Po dBm V Po dBm mV +53 +50 +49 +48 +47 +46 +45 +44 +43 +42 +41 +40 +39 +38 +37 +36 +35 +34 +33 +32 +31 +30 +29 +28 +27 +26 +25 +24 +23 +22 +21 +20 +19 +18 +17 +16 +15 +14 +13 +12 +11 +10 +9 +8 +7 +6 +5 +4 +3 +2 +1 200W 100W 80W 64W 50W 40W 32W 25W 20W 16W 12.5W 10W 8W 6.4W 5W 4W 3.2W 2.5W 2W 1.6W 1.25W 1.0W 800mW 640mW 500mW 400mW 320mW 250mW 200mW 160mW 125mW 100mW 80mW 64mW 50mW 40mW 32mW 25mW 20mW 16mW 12.5mW 10mW 8mW 6.4mW 5mW 4mW 3.2mW 2.5mW 2.0mW 1.6mW 1.
The bridge in the transceiver operates and makes decisions about packet forwarding just like any other bridge. The bridge builds a list of source MAC addresses that it has seen on each of its ports. There are a few general rules that arefollowed when a packet isreceived on any port: • If the destination address is a multicast or broadcast address, forward the packet to all ports. • If the destination address is not known, forward the packet to all ports.
expected to make up the majority of the traffic as is the case with VoIP (Voice over IP). 8.5 Subscriber-to-Subscriber Traffic When sending frames from an endpoint connected to one Subscriber to another endpoint with a different Subscriber, the throughput will be halved at best. This is because all frames must go through the Base Station and thus are transmitted twice over the same radio system.
9.0 INDEX OF CONFIGURATION PARAMETERS Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values Configuration – Identity & Time Device Name The Device Name is a user-configurable parameter that is used to ease configuration and monitoring. Typically this parameter is set to a label that makes it easy to identify the specific unit. The Contact parameter is used to indicate a contact in case of inquiry or problem with the unit.
Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values Configuration – IP & Networking Configuration Radio VLAN Status The VLAN Status parameter controls whether the VLAN capability of the device is enabled or not. Enabling the VLAN Status allows the configuration of trunk and access ports along with VLAN IDs and VLAN IP Addresses.
Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values Frame Profile The Frame Profile controls the amount of time allocated to the downlink and uplink portions of the WiMAX frame. To operate in a WiMAX compatible mode, choose one of the specific profiles for the chosen RF bandwidth. The Frame Profile can also be set to None. When set to None, the user can set a specific percentage for the downlink sub-frame. None None, 3.
Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values ConfigurationServices Configuration – Security DHCP Server Status This parameter enables the on-board DHCP server. Disabled DHCP Netmask This is the netmask that the on-board server specifies to its clients. 0.0.0.0 DHCP starting address This is the first IP address in the server’s pool. 0.0.0.0 DHCP ending address This is the last IP address in the server’s pool. 0.0.0.
Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values Device Auth Mode Maint & Status Events & Alarms Determines if WiMAX PKMv2 security is enabled. None RADIUS Server 1 Address This is the IP address of the RADIUS server. The device can also be configured with a secondary, backup RADIUS server. 0.0.0.0 RADIUS Server 1 Port The UDP port that the RADIUS server is listening on.
Table 7. Configuration Parameters Location Parameter Description Default Value Possible Values Maint & Status Configuration Files Maint & Status Firmware Utilities 56 File Media The File Media parameter is present on several pages in which files are transferred to and/or from the Mercury transceiver. The File Media indicates the source or the destination of the file to be transferred. The media can be FTP, SFTP, TFTP, or USB Flash Drive.
APPENDIX-A 3650 MHz Band Information Band History • Historically part of the Fixed Service Satellite (FSS) allocation • FSS operators are considered “grandfathered” operations and are provided protection in the form of “exclusion zones” • About 85 users remain, mostly on East and West Coasts of U.S. • Over 20 states with no grandfathered operations in effect • Recently, the FCC allocated 50 MHz of this spectrum (3.65 – 3.
U.S. Map with Exclusion Zones Supported SNMP MIBs • MIB-II • GE MDS proprietary MIBs • WiMAX MIBs (support to be added in 2012) Accessories list • Antennas • Cable • USB cable, CAT5, serial DB9s • RF cable 58 MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev.
APPENDIX-B Glossary of Terms & Abbreviations If you are new to wireless IP/Ethernet systems, some of the terms used in this guide may be unfamiliar. The following glossary explains many of these terms and will prove helpful in understanding the operation of your radio network. While not all of these terms apply to every use of the transceiver, they are provided to give a more complete understanding of common wireless concepts.
Cyclic Redundancy Check (CRC)—A technique used to verify data integrity. It is based on an algorithm which generates a value derived from the number and order of bits in a data string. This value is compared with a locally-generated value and a match indicates that the message is unchanged, and therefore valid. Datagram—A data string consisting of anIP header and the IP message within. dBi—Decibels referenced to an “ideal” isotropic radiator in free space. Frequently used to express antenna gain.
versed process is applied at the ot her end of the network extracting the data from the IP envelope, resulting in the original packet in the original protocol. Endpoint—IP address of data equipment connected to the ports of the radio. Equalization—The process of reducing the effects of amplitude, frequency or phase distortion with compensating networks. Fade Margin—The greatest tolerable reduction in average received signal strength that will be anticipated under most conditions.
MAC—Media Access Control. MD5—A highly secure data encoding scheme. MD5 is a one-way hash algorithm that takes any length of data and produces a 128 bit “fingerprint.” This fingerprint is “non-reversible,” it is computationally infeasible to determine the file based on the fingerprint. For more details review RFC 1321 using an Internet search. MCU—Microcontroller Unit. MIB—Management Information Base. MIMO—Multiple In / Multiple Out.
ered authenticated when it has agreed with the access point on the type of encryption that will be used for data packets traveling between them. The process of association causes a station to be bound to an access point and allows it to receive and transmit packets to and from the access point. In order for a station to be associated it must first authenticate with the access point. The authentication and association processes occur automatically without user intervention.
SCEP—Simple Certificate Enrollment Protocol. A protocol that automates the provisioning process of creating and loading x.509 digital certificates on a device. SFTP—Secure File Transfer Protocol. A networking protocol used to securely transfer files between a server and a client device. SNMP—Simple Network Management Protocol. SNR—Signal-to-Noise Ratio. A measurement of the desired signal to ambient noise levels.This measurement provides a relative indication of signal quality.
IN CASE OF DIFFICULTY... GE MDS products are designed for long life and trouble-free operation. However, this equipment, as with all electronic equipment, may have an occasional component failure. The following information will assist you in the event that servicing becomes necessary. TECHNICAL ASSISTANCE Technical assistance for GE MDS products is available from our Technical Support Department during business hours (8:30 A.M.–6:00 P.M. Eastern Time).
GE MDS, LLC 175 Science Parkway Rochester, NY 14620 Telephone: +1 585 242-9600 FAX: +1 585 242-9620 www.gemds.
