Alligator 2288 Technical Manual

Mas ethernet/rs-232 uhf radio transceiver

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Preliminary Release

Model 2288 MAS

Ethernet/RS-232

UHF Radio Transceiver

Technical Manual

Alligator Communications Model 2288 Technical Manual REV3.0

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Summary of Contents for Alligator 2288

Page 3: Table Of Contents
5.5 Operational Mode..........................20 5.6 Group Code............................20 5.7 IP Address............................20 5.8 Telnet Port.............................21 5.9 Gateway Address...........................21 5.10 Subnet Mask..........................21 5.11 RS-232 Data Rate...........................21 5.12 Anti-streaming Timer........................21 5.13 Telnet Session Activity Timer......................22 Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 3...
Page 4 6.0 Theory of Operation..........................27 6.1 RS-232 Communications........................27 6.2 Ethernet Communications......................27 6.2.1 Packet Forwarding........................27 6.2.2 Telnet Radio Configuration and Diagnostics................28 6.2.3 Graphics Heavy Communications.....................28 6.2.4 High QOS (Quality Of Service) IP Communications..............28 Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 4...
Page 5: Introduction
1.1 General Description The Alligator Communications Model 2288 is a microprocessor-controlled data radio transceiver designed to operate in accordance with FCC rules, Part 90 The 2288 data radio is frequency synthesized and programmable to individual transmitter and receiver frequencies in the 217-220 MHz frequency band.
Page 6: Technical Specifications
Type N female Power 2-pin Captive, Rectangular Data (RS-232) DB9F Environment Temperature -30°C to +60°C Humidity 95% at 40°C Dimensions 6.75” x 1.5” x 5.75” Weight 2 pounds Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 6...
Page 7 -80 dB Bandwidth 12.5, 25, or 50 kHz** *Other frequency bands available on special order **Other bandwidths available on special order by changing symbol rate and frequency deviation Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 7...
Page 8: Warranty
BUYER; and to be free from defects in material and workmanship. Alligator Communications will repair or replace, at its expense, for a period of one year from the date of delivery of equipment, any parts that are defective from faulty material or poor workmanship.
Page 9: Information To User, As Required By Fcc Section 15.21
Preliminary Release 1.6 Information to user, as required by FCC section 15.21 Changes or modifications not expressly approved in writing by Alligator Communications, Inc. may void the user’s authority to operate this equipment. In accordance with FCC Rules Section 15.21, the user of this equipment is advised that changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Page 10: Radio Configuration And Operational Check
2.2 Operational Bench Test To ensure that the 2288 radio is functional prior to installation at the desired site, it is highly recommended that the following tests be performed in sequence: (Please refer to 2.2.3 Initial Checkout.)
Page 11: Power Connector
Preliminary Release 2.2.2 Power Connector The DC power input connector to the 2288 radio is a rectangular two-pin locking connector. The radio unit is normally powered upon connection to a DC power source of +11 to +16 Vdc, +13.8 Vdc (nominal), +24 Vdc (optional). The red conductor is positive; the black conductor is negative and is internally grounded to the chassis.
Page 12 Preliminary Release 6. Download a Telnet client program for use on your lap-top such as puTTY. Configure puTTY to communicate to the 2288 on its IP address. The normal default IP address and port for the 2288 is 192.168.1.128 port 23.
Page 13 Preliminary Release 7. Open a Telnet session with the 2288. You should get a menu showing the current 2288 status and configuration (Fig. 2). You may end a Telnet session at any time by entering q. The menu can be re-displayed by either entering <CR> or <ESCAPE>.
Page 14 Configure one radio to be a master (om=1<CR>) to send a round-trip test packet (dt=5) to the remote radio. The master 2288 radio must also be given the 2288 MAC address of the remote radio. To enter the remote loop-back MAC address, enter: lb=##-##-##-##-##-## The remote radio (om=0<CR>...
Page 15: Field Configuration And Verification
6. Assign a group code if desired to identify a unique group of radios. This blocks accidental communications with other 2288 radios. For example, gc=3<CR>. 7. Decide if the 2288 is a master or remote. There is only one master 2288 radio in a point- to-point or point-to-multipoint radio network. For a master, configure with the command om=1<CR>.
Page 16 2288 radio can maintain a table of up to 512 RTU MAC addresses. Each remote 2288 radio can maintain a table of up to 2 RTU MAC addresses. Refer to the command summary for entering and reading RTU and host MAC addresses.
Page 17: Front Panel Indicators
Preliminary Release 14. The 2288 can operate using the AES256 encryption standard with the following commands: ee=0<CR> no encryption ee=1<CR> AES256 encryption No encryption results in the least number of extra characters appended to a message. This minimizes transmission latency. Encryption will pad extra randomized characters to create standardized message segment lengths of 128 bits.
Page 18: User Configuration And Diagnostic Menu
The 2288 uses a simple command line interface for configuring and monitoring key parameters and metrics. Access is via IP Telnet. The 2288 is set to a default IP address of 192.168.1.128 at time of shipment. The access is either local, using the Ethernet RJ-45 connector or remote through the radio system.
Page 19: Transmit Power
If the IP address is changed to a new subnet, make certain that the computer is also changed to the new subnet. 5.8 Telnet Port The 2288 Telnet port can be reassigned from the default of 23 to any port up to 65535. This adds additional security to the system. Alligator Communications Model 2288 Technical Manual REV3.0 Copyright ©...
Page 20: Gateway Address
Preliminary Release tnp=#####<CR> Examples: tnp=23<CR> tnp=1000<CR> tnp=65535<CR> 5.9 Gateway Address The 2288 must be given the gateway router IP address within its LAN subnet group. Normally it is the first IP subnet address ending in 1. gw=###.###.###.###<CR> Examples: gw=10.0.0.1<CR> gw=172.16.10.1 gw=192.168.1.1<CR>...
Page 21: Telnet Session Activity Timer
Examples: ep=0<CR> ep=1<CR> 5.18 ID (Identification Number) When password entry is enabled (ep=1), this ID must match to gain access to the 2288. The ID is case sensitive and can be any set of up to 16 characters, including letters, numbers, and punctuation marks.
Page 22: Encryption Phrase
Host filtering is easily done by entering the host MAC address in the host and remote 2288 radios. At the master only host sources are forwarded. At the remote only host destinations are forwarded. Up to 16 host MAC addresses can be placed in the host MAC address table.
Page 23: Remote Rtu0 Mac Address
5.24 Remote RTU0 MAC Address This is the RTU MAC hexadecimal address of the first RTU connected to a remote 2288. It is stored at the remote 2288 and is used when the remote radio is in forwarding mode 0 or 2. rtu0=##-##-##-##-##-##<CR>...
Page 24: Loopback Remote Mac Address
5.29 Loopback Remote MAC Address This is the remote radio hexadecimal MAC address placed in the master radio when performing the loopback diagnostic test (dt=5). Note that Alligator 2288 radios are currently assigned to MAC addresses starting with 70-b3-d5-9c-e. lb=##-##-##-##-##-##<CR>...
Page 25: Display Status Screen
The entire 512-entry RTU table is displayed: rtutable<CR> 5.33 Display Host Table The entire 16-entry host table is displayed: hosttable<CR> 5.34 Display QIP Table The entire 16-entry QIP table is displayed: qiptable<CR> Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 25...
Page 26: Theory Of Operation
It is not recommended in systems with either the master or remote ends tied to LANs due to the flooding potential. The 2288 defaults in this mode for testing but is not recommended for field deployment.
Page 27: Telnet Radio Configuration And Diagnostics
6.2.2 Telnet Radio Configuration and Diagnostics The primary mission of the 2288 is to provide robust RF linkage with total protocol transparency; however, a Telnet server for local and remote radio configuration is provided in each 2288. Thus, each 2288 is factory-assigned a unique Alligator MAC address for IP access using the Telnet protocol.
Page 28 Preliminary Release Internet 2888E 2888E Remote Master Radio Radio om=1 om=0 Bastion Host Computer Ethernet Ethernet 2888E Diagnostic Remote Computer Radio om=0 Ethernet Figure 1 Typical System Block Diagram Alligator Communications Model 2288 Technical Manual REV3.0 Copyright © 2018 Page 28...
Page 31 FCC Statement 1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. 2.

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