Etross ET-8848 User manual

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8848 GSM FWT (GATEWAY)
USER’S MANUAL

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1, General Description:
ET-8848 is a GSM to Analog Converter (single port, insert 1 SIM card only), the device can
produce a FXS line to allow a regular phone to be connected and used just like a local landline
(PSTN) except your calls will go out the GSM network. This device can both receive and make
calls.
The main application is: Connecting the RJ-11 FXS line to connect Ordinary telephone set for
voice call, to connect PBX for call extensions, to connect billing systems for public phone use, to
connect VoIP gateway to realize VoIP call termination, to connect alarm system for security
purpose, etc. It is not a VOIP gateway, nor a GSM+VOIP gateway. It is a GSM Fixed Wireless
Terminal that produces a Analog FXS phone line.
Available:
zGSM 900/1800Mhz dual band, employing Wavecom Q2303A, Q2403A Sim300W module
to make;
zGSM 900/1800/1900Mhz Tri-band, employing Sim300z module to make;
zGSM850/900/1800/1900MHz Quad band, employing Sim340z module to make.
1,FrontPicture 2,RearPicture
3, Front Picture with Antenna connection 4, Bottom side picture
1), Front side has LEDs display for Signal strength, Power, Working Status and Talking
indicator;

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2), Rear side has1pcs SMA antenna connectors, 2 RJ-11 output, Power port and switch;
3), Front side with 3m cable antennas, this only for display picture, in installation, antenna
must be put beyond 1.5m from terminal. Can’t be mounted on the terminal, otherwise noise will
be made;
4), Bottom side has 1pcs SIM card holder slots, you can insert SIM card into the slot.
2, Features:
1) It is a 1 channel GSM Gateway which has 2 RJ-11 interfaces for extensions;
2) It can connect with ordinary telephone sets, PBX , VOIP Gateway, Billing meter Alarm system
etc. ;
3) Dialing tone frequency:450 HZ;
4) Employs Industrial module [Sim300( Tri-band 900/1800/1900MHz), Sim340 (Quad band
850/900/1800/1900MHz) or Wavecom Q2303A,Q2403A,SIM300W(Dual band 900/1800MHz)]
to make;
5) Can adjust dial interval from 0.5sec to 9 sec by setting up from telephone set;
6) Can adjust voice volume by setting up from telephone set;
7) SIM card supported (1.8V, 3V);
8) Caller ID display, own ID hides (optional);
9) DTMF Dialing;
10) Bell signal;
11) Polarity reversal;
12) The RJ-11 socket which connect the phone or billing system for metering purpose;
13) Antenna socket (SMA);
14) IP Presetting;
15) Working status and Signal Strength by LED indicator;
16) IMEI Change (optional).
17)Back-up Li-ion battery( Optional) 7.2V 1300MA.
18)Standby time:24hrs, Talking time: 2.5hrs.
3,Technical Specifications
Air interface standard: GSM850/1900Mhz,900/1,800Mhz phase 2+ full band
Frequency ranges:
A) GSM 850 GSM 1900:
I) Transmission: 869.2 ~ 893.8MHz I) Transmission: 1, 930 ~ 1, 990MHz
Ii) Reception: 824.2 ~ 848.2MHz Ii) Reception: 1, 850 ~ 1, 910MHz
B) GSM 900: GSM 1800:
I) Transmission: 890 ~ 915MHz I) Transmission: 1, 710 ~ 1, 785MHz
Ii) Reception: 935 ~ 960MHz Ii) Reception: 1, 805 ~ 1, 880MHz
Phone interface: supply RJ-11 Phone Interface
Hanging voltage: 45V
Picking off voltage: 30mA / 41mA
Dialing tone Frequency: 450Hz
Antenna interface: Antenna amplifying>2.5db
Sensitivity:<-104DBM

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Transmitting power<3W
AC-Adapter interface: Input: AC 110~240VAC 50~60Hz
Output:12DC1A.
AC-Adapter type: EU, US, AU, British can be optional
4, Operation Circumstance:
Operation temperature: -10c~60C
Storage temperature:-20C~70C
Operation humidity: 45%-95%
Atmosphere pressure: 86-106Kpa
Environment noise: <60DB
Transmitting Power: 2W
Sensitivity: <-104dbm
Antenna Amplifying: >2.5db
Dialing frequency: 450Hz
Hanging voltage: 45V
Picking current: 30mA/41mA
5, Check Package:
ET-8848 GSM FWT 1 piece;
Ac-adapter 12V 1A: 1 piece,
GSM Antenna with 3m cable 1 piece,
User’s Manual 1 piece,
G.W: 0.75kg per unit. And 20pcs per carton, 16kg per carton.
Gift carton Measurement: 55cmX34.5cmX32.5cm
6, Installation and Connection
The Condition for Installation
The terminal asks for 110- 220V AV power supply. It must be installed in the area where the
GSM network can cover. The strength of the signal can affect the quality of voice.
1. Screw off the screws that are on the back of the terminal, Insert SIM card for every Sim card
holder, and then tighten the screws.
2. Install antenna. In order to ensure the quality of voice, antenna must be put beyond 1.5 from
the telephone and terminal.
3. On end of the telephone line connects to the “Phone” port of the terminal, the other end
connects to telephone.
4. “Power” port connects to power adapter that is connected to 110-220V AC power supply.
1) The Installation for Connecting to Ordinary Telephone

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The Sketch for connecting ordinary Telephone
Draw your attention: Because there are many types of ordinary telephone and their electric
parameters are different. In order to avoid mutual disturbance between telephone and terminal
and affect voice quality. The distance between telephone and terminal is 1.5m at least.
2) The installation for connecting to billing device for metering
If the users demand to register cost during calls, billing device can be connected between
terminal and ordinary telephone. Billing device register cost according to the anti-polarity signal
that is provided by terminal.
The sketch for connecting to Billing device or Computer charging system
3) The installation for connecting to PBX for call extension
If users want to connect small PBX to this terminal, connect terminal’s “Phone port” to the PBX.
The sketch for connecting to PBX device.

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4) The installation for connecting VoIP gateway for Call Termination
Suppose a VoIP call originates from US, which was transferred from US Server to China Server
on VoIP, finally the call will be terminated from internet to GSM network and to be sent out to the
destination answer side.
The sketch for connecting to VoIP gateway
5) The installation for connecting to alarm system for Security
The GSM FWT can substitute the PSTN for connecting to alarm system for security purpose
when PSTN failure or not available.
The sketch for connecting to alarm system

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7, Function Setting
Before you do the following function settings, Lift handset or press hands free key of telephone
set, then you can press the buttons according to the following instructions to finish setting, you
will hear 2 beeps after you finish, this testify setting successfully.
1) Adjust dial interval
*#01#30# , 01--command，30--time，Max 9.9 seconds，Min 0.5 seconds, factory default setting is
3 seconds.
*If you use ET-8888 for connecting to VoIP gateway,you can set dial interval as 0.5 second,
it can make PDD<5 sec (Method: *#01#05#);
*If you use ET-8848 for connecting telephone, PBX, billing device, you can set dial interval as
3 seconds or 5 seconds as you like (Method: *#01#30#, set the dial interval as 3 seconds).
2) Adjust Earphone Volume
*#02#15# 02--command，15--volume，Max 16，Min 1, factory default setting is 15.
3) Adjust Mic. Volume (sensitivity)
*#03#10# 03--command，10--amount，Max 16，Min 1, factory default setting is 10.
4) Setting local area code
*#04#*0755# 10--command，*0755—area code，Max 5 numbers, use "*" instead if area code is
less than 5 digits.
5) Setting IP numbers
*#05#17911# 05--command，17911—IP numbers，Max 5 numbers, use "*" instead if IP number
is less than 5 digit.
6) Restore to factory default setting
*#99#99# Restore to factory default setting.
7）IMEI change
We will provide you data cable and software for you, If you need to do IMEI change, Contact with

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our sales staff for inquiry.
8, Making Calls and Answer Incoming Calls
Making Calls
1. Lift the handset or press “hand-free” key, you will hear dialing tone, then you can dial the
telephone numbers you want to call.
2. Dialing: dialing the telephone numbers you want to call
3. On completion of dialed digits, you can press “#” to transmit the called telephone
numbers. If you don’t dial any key for continual 3 seconds during the dialing, terminal
transmits called telephone numbers automatically.
4. During calls, if the telephone numbers is not free ones, the terminal sends out
anti-polarity signal.
5. If the calling party or called party hangs up, the terminal stops sending out anti-polarity
signal.
Answering Incoming Calls
When some calls are coming in, if the connected telephone has the function of displaying
incoming calls, the telephone rings and displays the incoming telephone numbers. Now
users can lift the handset or press “hand-free” to answer it.