Alligator 2788 mas User manual

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Model 2788 MAS

Ethernet/RS-232

UHF Radio Transceiver

Technical Manual

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REVISION HISTORY

REV DESCRIPTION DATE

1 Initial Release 10/15/2018

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Paragraph Contents Page

1. 5

1.1 General Description5

1.2 Applications5

1.3 Technical Specifications6

1.4 Warranty8

1.5 Claims for damage in shipment8

1.6 Information to user, as required by FCC section 15.219

1.7 RF exposure information9

2.0 Radio Configuration and Operational Check10

2.1 General Discussion10

2.2 Operational Bench Test10

2.2.1 Antenna Connector10

2.2.2 Power Connector11

2.2.3 Initial Checkout11

3.0 Field Configuration and Verification15

3.1 15

4.0 Front Panel Indicators17

5.0 User Configuration and Diagnostic Menu18

5.1 18

5.2 18

5.3 18

5.4 19

5.5 19

5.6 19

5.7 19

5.8 19

5.9 20

5.10 Subnet Mask20

5.11 RS-232 Data Rate20

5.12 Anti-streaming Timer20

5.13 Telnet Session Activity Timer20

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5.14 Log-in Session Activity Timer20

5.15 Enable Transmitter21

5.16 Enable Encryption21

5.17 Enable Password Entry21

5.18 ID (Identification Number)21

5.19 Password21

5.20 ES Encryption Phrase21

5.21 Log Out22

5.22 Quit Telnet22

5.23 Forwarding Mode22

5.24 Remote RTU0 MAC Address22

5.25 Remote RTU1 MAC Address23

5.26 Master RTU MAC Address Table23

5.27 Host MAC Address Table23

5.28 High QOS (Quality Of Service) IP Address Table23

5.29 Loopback Remote MAC Address24

5.30 Diagnostic Tests24

5.31 Display Status Screen25

5.32 Display RTU Table25

5.33 Display Host Table25

5.34 Display QIP Table25

6.0 Theory of Operation26

6.1 RS-232 Communications26

6.2 Ethernet Communications26

6.2.1 Packet Forwarding26

6.2.2 Telnet Radio Configuration and Diagnostics27

6.2.3 Graphics Heavy Communications27

6.2.4 High QOS (Quality Of Service) IP Communications27

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Introduction

Thank you for purchasing the Alligator Model 2788 UHF Radio Transceiver. We are here to

assist you personally should any questions arise in the installation or operation of this product.

Please feel free to call us. We look forward to your feedback and will strive to make our product

as compliant with your specific needs as possible.

1.1 General Description

The Alligator Communications Model 2788 is a microprocessor-controlled data radio

transceiver designed to operate in accordance with FCC rules, Parts 27 and 90 The 2788 data

radio is frequency synthesized and programmable to individual transmitter and receiver

frequencies in the 757 and 788 MHz frequency band. The transceiver is a fixed channel, half-

duplex radio available with a channel bandwidth of 12.5 kHz and up to 100 kHz. It interfaces

with both Ethernet and RS-232.

1.2 Applications

The 2788 data radio is designed for point-to-multipoint or point-to-point licensed operations in

the 700 MHz band. Some of the most common applications are:

Electric Utility Substation SCADA

Pipeline Flow Monitors

Energy Distribution & Metering Applications

Gas or Petroleum Production Well Head Control and Monitoring

Water Distribution and Waste Water Collection Control and Monitoring

Petroleum Production, Transmission, Storage and Distribution

Railroad

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1.3 Technical Specifications

GENERAL

Frequency 787-788 MHz

Input Voltage 10-24 Vdc

Current Consumption (at 13.8 Vdc) <80 mA

Receive Mode 100 mA

Transmit Mode (0.2 Watts) < 0.5 A

Data Rate 9600 bps to 38.4 kbps

Connectors

Antenna Type N female

Power 2-pin Captive, Rectangular

Data (RS-232) DB9F

Environment

Temperature -30°C to +50°C

Humidity 95% at 40°C

Dimensions 6.75” x 1.5” x 5.75”

Weight 2 pounds

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TRANSMITTER

RF Power 2 W

Impedance 50 Ohms

Frequency Range 757-758 MHz

Frequency Step Size 1 Hz

Frequency Stability ±1 ppm

Modulation 4GFSK

Symbol Rate 4800 Hz**

Data Rate 9600 bps

Maximum Frequency Deviation 2400 Hz**

Attack Time <1 msec

Release Time <0.5 msec

Bandwidth 6.25, 12.5, 25, or 50 kHz**

RECEIVER

Input Sensitivity -117 dBm at 10-6 BER

Impedance 50 Ohms

Frequency Range 757-758 MHz

Frequency Step Size 1 Hz

Frequency Stability ±1 ppm

Selectivity 100 dB

Desensitization -60 dB

Intermodulation -75 dB (EIA)

Spurious Image Rejection -80 dB

Bandwidth 6.25, 12.5, 25, or 50 kHz**

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deviation

1.4 Warranty

Alligator Communications, Inc., warrants each of the instruments of its manufacture to meet

the specifications when delivered to the 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. This Warranty does not cover equipment which has been

misused and/or altered by the user.

Instruments found to be defective during the warranty period shall be returned to the factory

with transportation charges prepaid by the BUYER. It is expressly agreed that replacement and

repair shall be the sole remedy of the SELLER with respect to any defective equipment and

parts hereof and shall be in lieu of any other remedy available by applicable law. All returns to

the factory must be authorized by the SELLER, prior to such returns. Upon examination by the

factory, if any instrument is found to be defective, the unit will be repaired and returned to the

BUYER, with transportation charges prepaid by the SELLER. This warranty does not apply to

equipment which, in the opinion of the SELLER, has been altered or misused.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. ALLIGATOR COMMUNICATIONS IS NOT

LIABLE FOR CONSEQUENTIAL DAMAGES.

1.5 Claims for damage in shipment

The instrument should be inspected and tested as soon as it is received. If the instrument is

damaged in any way, or fails to operate properly, a claim should immediately be filed with the

freight carrier, or, if insured separately, with the insurance company.

WE PLEDGE OUR IMMEDIATE AND FULLEST COOPERATION TO ALL USERS OF OUR ELECTRONIC

EQUIPMENT.

PLEASE ADVISE US IF WE CAN ASSIST IN ANY MANNER:

Alligator Communications, Inc.

1400 Coleman Avenus

Santa Clara, CA 95050

Phone: (408) 327-0800

FAX: (408) 327-0808

E-mail: [email protected]

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Website:

www.alligatorcom.com

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.

1.7 RF exposure information

FCC Rule Section §1.11307 and Industry Canada RSS-102 regulations contain limits on human RF

exposure from transmitters. To meet these requirements, during operation, the antenna of this

device must be kept at a minimum distance of 112 cm from all persons.

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2.0 Radio Configuration and Operational Check

2.1 General Discussion

Prior to customer installation and electrical connection of the customer’s terminal equipment

to the 2788 radio, it is recommended that the installing technician conduct a brief operational

checkout of the 2788 radio and confirm that all operating parameters are set as desired.

This initial checkout and possible reprogramming/customization is generally performed on the

maintenance shop test bench before the radio is installed and commissioned in a link

application.

The following parts of this section provide guidance in this checkout process and illustrate

alternate configurations and paths to perform the initial checkout.

2.2 Operational Bench Test

To ensure that the 2788 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.)

2.2.1 Antenna Connector

The 2788 radio antenna port (RF Connector) is a coaxial, female, Type N connector. This

connector mates with a male cable connector, Type N such as Amphenol 3900, Andrew L44N,

or MIL Type UG-21. Under most circumstances, bench tests are conducted with a service

monitor (manufactured by IFR Inc., Marconi Instruments Ltd., Hewlett-Packard, Motorola, etc.).

CAUTION

The transmitter should not be keyed on or placed in the transmit

mode without a load connected to the antenna port to prevent

damage to the 2788 radio Power Amplifier due to long periods

(more than 10 minutes) of severely high SWR. An antenna, service

monitor, or dummy load should be attached to the antenna port.

The 2788 radio power output is approximately 2 Watts maximum,

so if a service monitor is connected to the antenna port, ensure

that the service monitor’s input port can handle at least a 5 watt

input to avoid damaging the service monitor.

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2.2.2 Power Connector

The DC power input connector to the 2788 radio is a rectangular two-pin locking connector.

The radio unit is normally powered upon connection to a DC power source of +11 to +24 Vdc,

+13.8 Vdc (nominal). The red conductor is positive; the black conductor is negative and is

internally grounded to the chassis.

2.2.3 Initial Checkout

Alligator wireless data transport products are factory-configured according to customer

configuration information received prior to shipment from the factory; thereby, customer field

configuration requirements are minimized.

To verify that 2788 radio parameters are correct, we recommend the following minimal tests be

conducted with regards to the transmitter and receiver settings of the 2788 radio:

1. Connect a 50 Ohm dummy load to the antenna Type N connector. The dummy load

must have a power rating of at least 5 Watts. Always insure that a load or antenna is

connected to the Type N connector before DC power is applied.

2. Connect a spectrum analyzer to the dummy load through a power attenuator (30 dB

recommended).

3. Connect a computer to the 2788 using a CAT5 Ethernet cable between Ethernet

connectors. Alternatively, you may use two CAT5 cables, each connected to a

multiport Ethernet router switch. Do not use an Ethernet hub because they may be

a source of errors.

4. Connect a 12Vdc power source to the power input, +12V on red, GND on black.

Observe all LEDs activate at power-up to verify LED functionality. The PWR LED

should remain on.

5. Configure your computer for an IP address in the 192.168.1.X space (but do not use

192.168.1.1 or 192.168.1.128). This can be changed later, but is necessary for initial

Telnet communication with the 2788. For example, use 192.168.1.2 .

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6. Download a Telnet client program for use on your lap-top such as puTTY. Configure

puTTY to communicate to the 2788 on its IP address. The normal default IP address

and port for the 2788 is 192.168.1.128 port 23.

Below shows a typical puTTY configuration for communicating with the 2788 on IP

default address 192.168.1.128 port 23. Be sure to have your computer IP address set in

the subnet range. puTTY should have Terminal set for local echo on. For example,

below the computer has an IP address of 192.168.1.2 and communicates via Telnet to

the 2788 on the default IP address 192.168.1.128 port 23.

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7. Open a Telnet session with the 2788. You should get a menu showing the current

2788 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>.

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8. Set the desired transmitter frequency. For example, tf=757.0950.0<CR>.

9. Set the desired receiver frequency. For example, rf=787.0940.0<CR>.

10. Set the desired transmit power. For example, tp=1<CR>.

11. Use the dt=1<CR> command to activate the transmitter carrier in CW mode to

confirm frequency and RF level on a spectrum analyzer. You will have 120 seconds

before the anti-streaming timer expires and deactivates the CW carrier. Typing

<ESCAPE> or <ENTER> will deactivate the CW carrier.

12. You may run other optional tests to verify radio functionality:

a. Connect two 2788 radios together using suitable attenuators and coaxial cable.

Configure one radio to transmit CW (dt=1<CR>) and the other to receive CW

(dt=2<CR>). The receiver displays the received signal strength in dBm.

b. Connect two 2788 radios together using suitable attenuators and coaxial cable.

Configure one radio to be a master (om=1<CR>) to send test packets (dt=3) and the

other to be a remote (om=0) to receive test packets (dt=4<CR>. The receiver will

monitor the number of good and bad test packets received in this one-way test.

c. Connect two 2788 radios together using suitable attenuators and coaxial cable.

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 2788 radio must also be given the 2788 MAC

address of the remote radio. To enter the remote loop-back MAC address, enter:

lb=##-##-##-##-##-##

The remote radio (om=0<CR> will automatically echo back packets when in the

dt=0<CR> configuration.

13. Alligator provides software testing tools to do end-to-end testing such as the

Alligator Packet Error Rate Tester. For example, Alligator provides software tools for

simulating a host sending random data messages to keep track of errors that are not

echoed back properly by an RTU simulator tool.

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3.0 Field Configuration and Verification

Prior to field installation of the 2788, it is crucial that that bench configuration and testing be

done using cables and RF attenuators to duplicate the deployed system or subsystem. This adds

confidence that the configuration has been done properly and stream-lines field installation.

Each remote configured 2788 must be tested with a master configured 2788 to verify proper

operation. This places deployed radios in final configuration so no additional programming is

necessary when final field installation is performed. This is highly recommended for a smooth

system deployment.

3.1 Field Configuration Bench Test

1. Update the 2788 IP address to the desired fielded IP address. Each 2788 must be

assigned to a unique IP address in the subnet of the access point router. For example,

ip=10.0.0.5<CR>. Once this instruction is entered, the Telnet connection is lost and must

be re-established on the new IP address.

2. Re-establish Telnet communications on the new IP address. Typically use a second lap-

top with its IP address configured to the desired IP subnet range and with a copy of

puTTY that can start a Telnet session with the 2788 on the newly assigned IP address.

3. Assign the access point router gateway IP address. For example, gw=10.0.0.1<CR>.

4. Assign the subnet mask. For example, sm=255.255.255.0 .

5. If desired, assign a different Telnet port from the default port 23. For example,

tnp=50000<CR>. If you change the Telnet port, you lose the session and must reconnect

on the newly assigned port number with puTTY.

6. Assign a group code if desired to identify a unique group of radios. This blocks accidental

communications with other 2788 radios. For example, gc=3<CR>.

7. Decide if the 2788 is a master or remote. There is only one master 2788 radio in a point-

to-point or point-to-multipoint radio network. For a master, configure with the

command om=1<CR>. For a remote, configure with the command om=0<CR>. The

primary difference between a master and remote is that a master passes host polls and

other unsolicited messages. The remote radio passes responses from the polled RTU.

Occasionally the RTU generates unsolicited transmissions to the remote radio. This

causes no disturbance to the polling process. The remote radio buffers the packet(s)

until a clear time to send back to the host. Note that both the master radio and remote

radios are transparent to the protocols encapsulated in the Ethernet packets or RS-232

serial data.

8. If using RS-232, select the terminal data rate. The data rate can be selected from 1200,

2400, 4800, 9600, or 19200 bps. For example, dr=9600<CR> selects 9600 bps. Note that

in RS-232 systems, the Ethernet connector is still used for Telnet control of the 2788.

The 2788 can handle RS-232 and Ethernet concurrently.

9. The 2788 has various forwarding modes to limit Ethernet access to the radio network at

both the master and remotes ends of the radio link. This aids in preventing flooding the

radio network with unwanted packets. The 2788 shipping default is fm=3<CR>. This

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mode forwards all packets (known as promiscuous packet forwarding mode). This mode

is only recommended for small systems and testing. The recommended mode is

fm=1<CR> (host mode forwarding). In this mode a master radio will only forward

packets with a tabulated host source MAC address. A remote radio in host forwarding

mode only forwards packets with a tabulated host destination MAC address. Up to 16

addresses can be stored in the 2788 remote or master radio. For additional flooding

protection, additional filtering can be configured to perform RTU MAC filtering also. The

host 2788 radio can maintain a table of up to 512 RTU MAC addresses. Each remote

2788 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.

10. When using host forwarding (fm=0 or fm=1) on either the master or remote 2788 radio,

determine the host MAC Ethernet address and enter it in the host table using the

command: host[n]=##-##-##-##-##-##<CR>, where n is a lower case hexadecimal

number 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e, or f.

Up to 16 host MAC addresses may be stored in the host table memory. Each MAC

address contains 6 bytes, in lower case hexadecimal, with hyphen separators between

individual bytes. Enter hosttable<CR> to display the host table.

11. When using master RTU forwarding (fm=0 or fm=2), the master 2788 radio (om=1) must

contain a list of all RTU MAC addresses (up to 512). Enter an RTU address using the

following command: rtu[abc]=##-##-##-##-##-##<CR>, where abc is a lower case

hexadecimal number from 000 to 1ff (0 to 511 decimal). Enter rtutable<CR> to display

the RTU table on a 2788 radio configured as a master (om=1).

12. When using remote RTU forwarding (fm=0 or fm=2), the remote 2788 radio (om=0)

contains a list of up to 2 RTU MAC addresses. These addresses correspond to the RTUs

connected to that particular remote 2788 radio. The first RTU MAC is entered with the

following command: rtu0=##-##-##-##-##-##<CR>. The second (if any) RTU MAC address

is entered with the following command: rtu1=##-##-##-##-##-##<CR>. These two MAC

addresses are displayed in the regular status menu on a 2788 radio configured as a

remote (om=0).

13. Access to the 2788 can be restricted to personnel knowing an id and password. To

enable this password protection, enter the following command: ep=1<CR>. The id is set

using: id=### . . . ###<CR>, where the id is up to 16 characters and is case sensitive. The

password is set using: pw=### . . . ###<CR>, where the password is up to 16 characters

and is case sensitive. The default id is admin and the default password is password.

Once a session is completed, the user logs out using the log out command: lo<CR>.

Should the user forget to log out, it will automatically log out due to user keyboard

inactivity after the lgt time. Should the password and/or id be forgotten, the factory

default can be restored by removing the 2788 cover and pressing the push button. (See

Fig. 3) The push button also restores the original defaults for the IP address, subnet

mask, and gateway. To disable password protection, either press the push button or

enter ep=0<CR>.

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14. The 2788 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. The pad characters are

removed at the receiver.

The AES256 standard uses a 256-bit key. The key is generated from a user generated

phrase. This phrase can be up to 32 case sensitive characters. It is entered with the

command: aesp=### . . . ###<CR>. The phrase is converted into a 256 bit key using the

SHA256 secure hashing algorithm. This key is used by the AES256 encryption and

decryption algorithms.

15. Should it be necessary, the transmitter can be disabled with the command: et=0<CR>.

To re-enable the transmitter: et=1<CR>.

4.0 Front Panel Indicators

The six front panel LEDS are defined in Table 1:

LED

Description

PWR

On when 12 Vdc power is applied.

RXD1

On when receive data is active.

RXD2

On when diagnostic receive data is active.

DCD

On when receive data preamble is detected.

TXD1

On when transmit data is active.

TXD2

On when diagnostic transmit data is active.

Table 1LED Definition

The LEDs show the status of both Ethernet and RS-232 serial data. Diagnostic data occurs during

Telnet sessions.

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5.0 User Configuration and Diagnostic Menu

The 2788 uses a simple command line interface for configuring and monitoring key parameters

and metrics. Access is via IP Telnet. The 2788 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. The command line interface facilitates writing scripts for automated

configuration. Contact Alligator for GUI based software utilities that front-end the Telnet

commands to simplify network management of multiple 2788 radios further .

Should it ever be necessary, an internal push-button resets the IP address to the default of

192.168.1.128 and default Telnet port to 23. The push-button also resets the password,

encryption phrase, and takes the unit out of password mode. The remaining parameters are

unchanged. (See Fig. 3)

5.1 Transmitter Frequency

The transmitter frequency is set in MHz with up to 9 significant figures. The allowed frequency

range is from 757 to 788 MHz. The full format is:

tf=###.######<CR>

The decimal point is optional. Trailing zeros are optional.

Examples: 757<CR> 757.0<CR> 757.1<CR> 757.12<CR> 757123456<CR>

5.2 Receiver Frequency

The receiver frequency is set in MHz with up to 9 significant figures. The allowed frequency

range is from 757 to 788 MHz. The full format is:

rf=###.######<CR>

The decimal point is optional. Trailing zeros are optional.

Examples: 757<CR> 757.0<CR> 757.1<CR> 757.12<CR> 757123456<CR>

5.3 Frequency Calibration

The 2788 frequency reference is a precision TCXO (Temperature Compensated Crystal

Oscillator) that is factory tuned to 1 ppm accuracy. Should it ever be necessary to adjust the

compensation, the following command permits trimming the PLL multiplier that directly affects

the TX and RX frequencies in steps of 1 Hz:

fc=xxxx<CR>

Examples: 100<CR> -100<CR> 10<CR> -10<CR>

Normally calibration is performed by transmitting a CW carrier (dt=1) and monitoring the

output frequency on a calibrated frequency counter.

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5.4 Transmit Power

The 2788 transmitter output power has three power settings:

1= Low (0.5 W); 2 = Mid (1 W) ; 3 = Hi (2 W)

tp=x<CR>

Examples: tp=1<CR> ; tp=2<CR> ; tp=3<CR>

5.5 Operational Mode

The 2788 has two operational modes:

0 Remote

1 Master

Systems can be configured for single or dual frequency. No advantage in latency is gained by

using two channel frequencies.

Systems use 1 master (om=1) and up to 512 remotes (om=0). It requires that the master have

line of sight to all remote radios.

om=x<CR>

Examples: om=0<CR> ; om=1<CR>

5.6 Group Code

To prevent confusion of two or more separate 2788 systems, there are 16 unique group codes

to distinguish 2788 groups, ranging from 0 to 15. The default group code is 0.

gc=##<CR>

Examples: gc=0<CR> ; gc=1<CR>; gc=15<CR>

5.7 IP Address

Each 2788 radio must be assigned a unique IP address within its LAN subnet group. This permits

both local and remote access of radio configuration and status information. The default IP

address is 192.168.1.128. It must be changed prior to field deployment. The IP address assigned

to the radio is for diagnostic purposes to control and monitor the 2788 locally or remotely.

ip=###.###.###.###<CR>

Examples: ip=10.0.0.100<CR> ; ip=172.16.10.100; ip=192.168.1.10<CR>

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 2788 Telnet port can be reassigned from the default of 23 to any port up to 65535. This

adds additional security to the system.

tnp=#####<CR>

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Examples: tnp=23<CR>; tnp=1000<CR> ; tnp=65535<CR>

5.9 Gateway Address

The 2788 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>

5.10 Subnet Mask

The 2788 must be given a subnet mask. The default is 255.255.0.0

sm=###.###.###.###<CR>

Examples: sm=255.255.0.0<CR> ; sm=255.255.255.0

5.11 RS-232 Data Rate

The 2788 has a DB9 connector to permit using an RS-232 interface. The asynchronous data

format is one start bit, eight data bits, and one stop bit with no parity. The data rate can be set

to one of five possible rates: 1200 bps, 2400 bps, 4800 bps, 9600 bps (default), and 19200 bps.

dr=####<CR>

Examples: dr=1200<CR> ; dr=2400<CR> ; dr=4800<CR> ; dr=9600<CR> ; dr=19200<CR>

5.12 Anti-streaming Timer

The transmitter key on time is timed to prevent disrupting the channel. The maximum on time

is the anti-streaming time defined in seconds. The default is 120 seconds. This is most often

invoked when performing testing with a CW carrier that is activated remotely.

ast=####<CR>

Examples: ast=120<CR>; ast=9999<CR>

5.13 Telnet Session Activity Timer

The 2788 times activity when engaged in Telnet communications. If there is inactivity for more

than the specified time duration in seconds, the Telnet session is automatically terminated. The

default Telnet session activity timer default is 120 seconds.

tnt=####<CR>

Examples: tnt=300<CR> ; tnt=9999<CR>

5.14 Log-in Session Activity Timer

The 2788 times activity when using password access (pw=1). If there is inactivity for more than

the specified time duration in seconds, the log-in session is automatically terminated. The

default log-in session activity timer default is 120 seconds.

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