Introduction

Today, means of communication utilizing state-of-the-art hardware and software solutions evolve rapidly. At that, the following problem arises: how to implement new communication devices that utilize alternative data transmission principles into existing communication networks.

The solution is to use special equipment that interconnects the diverse network segments. Currently, such equipment is represented by digital gateways. They allow a gradual transition from existing communication networks to more efficient ones that utilize alternative operation principles.

At present, IP networks are considered to be the most efficient as they are weakly related to the data transfer environment or data type and also flexible and manageable. Designed and manufactured by Eltex, SMG digital gateway allows interfacing of traditional communication networks based on the circuit-switching principle with communication networks used packet-switching data transmission.

This operation manual details main features of SMG-1016M, SMG-2016 and SMG-3016 digital gateways. In this document you will find technical specifications of the gateway and its components. Also, it contains an overview of the operation procedure and software-based maintenance.

Product description

Application

Digital gateways SMG-1016M, SMG-2016 and SMG-3016 allow interfacing of PSTN (E1) signalling and media streams and VoIP networks, and also perform media gateway functions (codec conversion, conference call establishing, tone signal/DTMF reception and generation, voice message output).

The number of E1 paths supported by SMG can reach 16, the number of conversational (media) channels on the E1 side is up to 495 and on the VoIP side is 768 (when using the G.711 codec with packetization time 20 ms or greater).

The gateway submodular design allows one to flexibly change the capacity, and the minimum number of module types makes it easier to expand and upgrade the system.

SMG is an optimal and robust solution for telecommunication infrastructure upgrade, development and migration from PSTN to NGN.

The gateway allows one to organize one E1 stream per SORM console. E1 stream operating according to the SORM protocol contains 28 conversational channels for listening controlled subscribers. During combined control, the audio traffic from А and В subscribers is mixed to the SORM stream voice channel. Mixing of sound streams is performed using a three-way conference on the VoIP submodule. One VoIP submodule supports 27 three-way conferences. Thus, to ensure the possibility of interception simultaneously on all channels of the E1 stream, it is necessary that at least 2 VoIP submodules were installed on the gateway.

SMG main specifications:

• number of E1 interfaces: 4 to 16, in increments of 4;
• up to 768 VoIP channels (128 channels in TDM for connecting to a single submodule);
• number of Ethernet ports for SMG-1016M:
  
  • 3 × 10/100/1000BASE-T ports;
  • 2 × 1000BASE-X (SFP) ports.
• number of Ethernet ports for SMG-2016 and SMG-3016:
  • 4 × 10/100/1000BASE-T ports;
  • 2 × 1000BASE-X (SFP) combo ports.
• static address and DHCP support;
• DHCP server;
• VoIP protocols: SIP, SIP-Т, SIP-I, SIP-Q, MGCP¹, MEGACO¹, SIGTRAN¹; H.323²;
• TDM protocols: DSS1 (ISDN PRI Q.931), QSIG and CORNET to transmit subscriber name, SS7 (associated and quasi-associated modes operation), V5.2;
• support for Q.699 standard — interaction between DSS1 and SS7;
• SIP subscriber registration support:
  
  • up to  2000 for SMG-1016M;
  • up to 3000 for SMG-2016 and SMG-3016.
• DTMF transmission (SIP INFO, RFC2833, in-band, SIP NOTIFY);
• echo cancellation (G.168 recommendation);
• voice activity detector (VAD);
• comfortable noise generator (CNG);
• adaptive or fixed jitter buffer;
• V.152 data transmission;
• fax transmission:
  • G.711 pass through;
  • T.38 UDP Real-Time Fax.
• NTP support;
• DNS support;
• SNMP support;
• bandwidth and QoS restriction for SMG-1016M;
• ToS and CoS for RTP and signaling;
• VLAN for RTP, signalling and management;
• firmware update: via web configurator, CLI (Telnet, SSH, console (RS-232));
• configuration and setup (also remotely):
  
  • web configurator;
  • CLI (Telnet, SSH, console (RS-232)).
• remote monitoring:
  • web configurator;
  • SNMP.

SIP/SIP-T/SIP-I functions:

• RFC 2976 SIP INFO (for DTMF transmission);
• RFC 3204 MIME Media Types for ISUP and QSIG (ISUP support);
• RFC 3261 SIP;
• RFC 3262 Reliability of Provisional Responses in SIP (PRACK);
• RFC 3263 Locating SIP servers for DNS;
• RFC 3264 SDP Offer/Answer Model;
• RFC 3265 SIP Notify;
• RFC 3311 SIP Update;
• RFC 3323 Privacy Header;
• RFC 3325 P-Asserted-Identity;
• RFC 3326 SIP Reason Header;
• RFC 3372 SIP for Telephones (SIP-T);
• RFC 3398 ISUP/SIP Mapping;
• RFC 3515 SIP REFER;
• RFC 3581 An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing;
• RFC 3665 Basic Call Flow Examples;
• RFC 3666 SIP to PSTN Call Flows;
• RFC 3891 SIP Replaces Header;
• RFC 3892 SIP Referred-By Mechanism;
• RFC 4028 SIP Session Timer;
• RFC 4566 Session Description Protocol (SDP);
• RFC 5009 P-Header;
• RFC 5373 Requesting Answering Modes for the Session Initiation Protocol;
• RFC 5806 SIP Diversion Header;
• RFC 6432;
• Q1912.5 SIP-I;
• SIP and SIP-T/SIP-I interaction;
• SIP Enable/Disable 302 Responses;
• Delay offer;
• SIP OPTIONS Keep-Alive (SIP Busy Out);
• NAT support (comedia mode);
• SIP registrar (optional).

Typical application diagrams

This manual covers several SMG device connection methods.

Interfacing of TDM and VoIP network signalling and media streams

In this configuration, device enables connection for up to 16 E1 streams with various signalling protocols (SS7, ISDN PRI/QSIG/CORNET, V5.2) and maintenance for up to 768 channels uncompressed (G.711 codec), up to 432 channels compressed (G.729 A/20-80), or 324 T.38 fax channels.

Device connects to the IP network via 10/100/1000BASE-T network interface using H.323/SIP/SIP-T/ SIP-I protocols.

* – not supported in the current version

Figure 1 – Interfacing of TDM and VoIP network signalling and media streams

Figure 2 shows TDM and VoIP network interfacing example on interaction between МС240 digital PBX and ECSS-10 software switch.

* – not supported in the current version

Figure 2 – Interfacing of TDM and VoIP network signalling and media streams

Mini IP-PBX

In this configuration, device provides the registration of up to 2000 subscribers for SMG-1016M and up to 3000 for SMG-2016 and SMG-3016 as well as the interaction with PSTN network via 16 E1 streams with various signalling protocols (SS7, ISDN PRI/QSIG/CORNET, V5.2).

Figure 3 – Mini IP-PBX based on SMG-1016M

Figure 4 – Mini IP-PBX based on SMG-2016

Figure 5 – Mini IP-PBX based on SMG-3016

Outstation via V5.2

The activation of additional features of IP PBX ECSS-10 software module allows to arrange outstation via V5.2 protocol and to service up to 2000 subscribers for SMG-1016M and up to 3000 subscribers for SMG-2016 and SMG-3016 with support for wide VAS set. As an outstation, the equipment with V5.2 AN support from any other manufacturer can be used.

Figure 6 – V5.2 AN outstation based on SMG-1016M

Figure 7 – V5.2 AN outstation based on SMG-2016

Figure 8 – V5.2 AN outstation based on SMG-3016

Device design and operating principle

SMG-1016M design

SMG-1016M has a submodule architecture and contains the following elements:

• controller featuring:
  • control processor;
  • flash memory – 64 MB;
  • RAM – 512 MB.
• up to 4 E1 stream submodules C4Е1;
• up to 6 IP submodules SM-VP-M300;
• Ethernet switch (L2), 3 × 10/100/1000BASE-T ports, 2 × MiniGBIC (SFP) ports;
• switch fabric;
• phase-lock-loop (PLL) frequency control system.

The figure below shows SMG-1016M functional diagram.

Figure 9 – SMG-1016M functional diagram

SMG-2016 design

SMG-2016 has a submodule architecture and contains the following elements:

• controller featuring:
  • control processor;
  • flash memory – 1024 MB;
  • RAM – 4096 MB.
• up to 4 E1 stream submodules C4Е1;
• up to 6 IP submodules SM-VP-M300;
• Ethernet switch (L2), 4 × 10/100/1000BASE-T, 2 × MiniGBIC (SFP) combo ports;
• switch fabric;
• phase-lock-loop (PLL) frequency control system.

The figure below shows SMG-2016 functional diagram.

Figure 10 – SMG-2016 functional digram

SMG-3016 diagram

SMG-3016 has a submodule architecture and contains the following elements:

• controller featuring:
  • control processor;
  • flash memory – 8192 MB.
• up to 4 E1 stream submodules C4Е1;
• up to 6 IP submodulesSM-VP-M300;
• Ethernet switch (L2), 4 × 10/100/1000BASE-T ports, 2 × MiniGBIC (SFP) combo ports;
• switch fabric;
• out-of-band (OOB) port;
• phase-lock-loop (PLL) frequency control system.

The figure below shows SMG-3016 functional diagram.

Figure 11 – SMG-3016 functional digram 

SMG operating principle

In TDM-IP direction, signal coming to E1 streams is transferred to VoIP submodule audio codecs (6 lines x 128 TDM channels) via the intrasystem trunk to be encoded using one of the selected standards and transferred further in the form of digital packets to the Ethernet switch. In IP-TDM direction, digital packets coming from Ethernet switch are transferred to VoIP submodules to be decoded and transferred further to E1 streams via the intrasystem trunk.

External 2 Mbps E1 streams are transmitted to framers through matching transformers. At that, synchronization signal is extracted from the stream and issued to the common synchronization line of the device. The priority of synchronization lines is controlled at the software level according to the defined algorithm.

A switch fabric is integrated into the intrasystem trunk and enables communication between the E1 (C4E1) and VoIP (SM-VP-M300) submodules.

For device firmware architecture, see the figure below.

Figure 12 – SMG firmware architecture

Main specifications

Table below lists main specifications of the terminal.

Table 1 — Main specifications

VoIP protocols

Audio Codecs

Quantity of VoIP channels supported by a submodule depending on the codec type 

Electrical Ethernet interface specifications

Optical Ethernet interface specifications

Console parameters

E1 interface parameters

Redundancy

Number of conference participants

Supported file system for external media

Supported interfaces

External synchronization signal parameters      

General parameters

Design

SMG-1016M

SMG-1016M digital gateway has a metal case available for 19” rack-mount 1U shelf installation.

The front panel of the device is shown in the figure below.

Figure 13 – SMG-1016M front panel layout

Connectors, LEDs and controls located on the front panel of the device are listed in table 2.

Table 2 — Description of connectors, LEDs, and controls located on the front panel

The rear panel of the device is shown in the figure below.

Figure 14 – SMG-1016M rear panel layout

The following table lists rear panel connectors of the switch.

Table 3 — Description of rear panel connectors of the switch

SMG-2016

SMG-2016 digital gateway has a metal case available for 19” rack-mount 1U shelf installation.

The front panel of the device is shown in the figure below.

Figure 15 – SMG-2016 front panel layout

Connectors, LEDs and controls located on the front panel of the device are listed in table 4.

Table 4 — Description of connectors, LEDs, and controls located on the front panel

The rear panel of the device is shown in the figure below.

Figure 16 – SMG-2016 rear panel layout

The following table lists rear panel connectors of the switch.

Table 5 — Description of rear panel connectors of the switch

SMG-3016

SMG-3016 digital gateway has a metal case available for 19” rack-mount 1U shelf installation.

The front panel of the device is shown in the figure below.

Figure 17 – SMG-3016 front panel layout

Connectors, LEDs and controls located on the front panel of the device are listed in table 6.

Table 6 — Description of connectors, LEDs, and controls located on the front panel

The rear panel of the device is shown in the figure below.

Figure 18 – SMG-3016 rear panel layout

The following table lists rear panel connectors of the switch.

Table 7 — Description of rear panel connectors of the switch

LED indication

LED indicators located on the front panel represent the current state of the device.

Device light indication in operation

SMG-1016M

For device light indication in operation, see the table below.

Table 8 — Light indication of the device status in operation

SMG-2016

For device light indication in operation, see the table below.

Table 9 — Light indication of the device in operation

SMG-3016

For device light indication in operation, see the table below.

Table 10 — Light indication of the device in operation

LED indication of E1 stream status

For LED indication of Е1¹ stream status, see the table below.

Table 11 — Indication of E1 stream status

Light indication of Ethernet 1000/100 interfaces

The status of the Ethernet interfaces is indicated by LED indicators built into the 1000/100 connector and is shown in the table below.

Table 12 — Light indication of Ethernet 1000/100 interfaces

Light indication during startup and reset to factory defaults

SMG-1016M

For light indication during startup and reset to factory defaults, see the table below.

Table 13 — Light indication during startup and reset to factory defaults

SMG-2016, SMG-3016

For light indication during startup and reset to factory defaults, see the table below.

Table 14 — Light indication during startup and reset to factory defaults

Fault LED Indication

The table below lists detailed description of faults represented by the status of Alarm LED.

Table 15 — Fault LED Indication

'F' button operation

‘F’ button is used to reboot the device, restore the factory configuration and recover forgotten password.

To perform reset to factory defaults on operating device, see section Light indication during startup and reset to factory defaults: tables 13, 14.

When the factory configuration is restored, you can access the device by IP address 192.168.1.2 (mask 255.255.255.0):

• via telnet or console: login admin, password rootpasswd;
• via web configurator: login admin, password rootpasswd.

Next, it is possible to save the factory configuration, restore password or reboot the device.

Saving factory configuration

To save the factory configuration:

• reset the device to factory defaults (see section Light indication during startup and reset to factory defaults);
• connect via Telnet or Console with login admin, password rootpasswd;
• enter sh command (device will exit the cli mode and enter the shell mode);
• enter save command; 
• reboot the device using the reboot command.

The gateway will be restarted with the factory configuration.

*********************************************
*        Welcome to SMG-1016M               *
*********************************************

smg login: admin
Password: rootpasswd

********************************************
*           Welcome to  SMG-1016M           *
********************************************
        
Welcome! It is Wed Mar 11 08:45:20 NOVT 2015
SMG> sh     
/home/admin # save
tar: removing leading '/' from member names
**********
**********
***Saved successful
New image 1
Restored successful
/home/admin # reboot

Password reset

CLI password reset

Процедура сброса пароля:

• reset the device to factory defaults (see section Light indication during startup and reset to factory defaults);
• connect via Telnet or Console;
• enter sh command (device will exit the cli mode and enter the shell mode);
• enter restore command (восстановится текущая конфигурация);
• enter passwd admin command (устройство потребует ввести новый пароль и его подтверждение);
• enter save command;
• reboot the device using the reboot command.

The gateway will be restarted with new configuration and new password.

В случае перезагрузки без выполнения каких-либо действий, на устройстве восстановится текущая конфигурация без сброса пароля. The gateway will be restarted with new configuration and old password.

*********************************************
*        Welcome to SMG-1016M               *
*********************************************

smg login: admin
Password: rootpasswd

********************************************
*           Welcome to  SMG-1016M           *
********************************************
        
Welcome! It is Fri Jul  2 12:57:56 UTC 2010
SMG> sh
/home/admin # restore
New image 1
Restored successful
/home/admin # passwd admin
Changing password for admin
New password: 1q2w3e4r5t6y
Retype password: 1q2w3e4r5t6y
Password for admin changed by root
/home/admin # save
tar: removing leading '/' from member names
**********
**********
***Saved successful
New image 0
Restored successful
# reboot

WEB password reset

При наличии доступа к CLI для сброса пароля достаточно перейти в режим конфигурирования и ввести команду web user password <USER_INDEX> <LEN>, where:

If you have access to the CLI, to reset the password in configuration mode enter web user password <USER_INDEX> <LEN> command, where:

• <USER_INDEX> – web user index, 
• <LEN> – password length.

Executing this command will generate a new temporary random password of the specified length for the selected user:

********************************************
*           Welcome to  SMG-2016           *
********************************************
        
Welcome! It is Mon May 26 11:00:07 GMT+6 2025
SMG2016> config 
Entering configuration mode.
SMG2016-[CONFIG]> web user password 0 10
New password for 'admin': Yjh@(%o26h

The web user list command can be used to display a list of all web users:

********************************************
*           Welcome to  SMG-2016           *
********************************************
        
Welcome! It is Mon May 26 11:00:07 GMT+6 2025
SMG2016> config 
Entering configuration mode.
SMG2016-[CONFIG]> web user list 
        [0] admin
        [1] test

If you do not have access to the CLI, follow these steps to reset the password:

• reset the device to factory defaults (see section Light indication during startup and reset to factory defaults);
• connect via Telnet or Console;
• enter sh command (device will exit the cli mode and enter the shell mode);
• enter restore command (current configuration will be restored);
• сonnect to the device web interface at 192.168.1.2;
• enter to «Users: Management» section;
• change the password for admin;
• enter save command in console;
• reboot the device using the reboot command.

The gateway will be restarted with current configuration and new password.

If the device is rebooted without taking any action, the current configuration will be restored without the password being reset. The gateway will boot up with the current configuration and the old password.

*********************************************
*        Welcome to SMG-1016M               *
*********************************************

smg login: admin
Password: rootpasswd

********************************************
*           Welcome to  SMG-1016M           *
********************************************
        
Welcome! It is Fri Jul  2 12:57:56 UTC 2010
SMG> sh
/home/admin # restore
New image 1
Restored successful

At this stage, the password is changed via the web interface. 

/home/admin # save
tar: removing leading '/' from member names
**********
**********
***Saved successful
New image 0
Restored successful
# reboot

Delivery package

SMG-1016M

SMG-1016M standard delivery package includes: 

• SMG-1016M digital gateway;
• 2 × CENC-36M connectors (if UTP CAT5E 18 pairs cable were not included in order);
• 4 × Latches for CENC-36M (if UTP CAT5E 18 pairs cable were not included in order);
• RS-232 DB9(F) – DB9(F) connection cable;
• A mounting set for 19″ rack;
• Technical passport;
• User manual on CD (optional).

SMG-2016

SMG-2016 standard delivery package includes: 

• SMG-2016 digital gateway;
• A mounting set for 19″ rack;
• Technical passport;
• User manual on CD (optional).

SMG-3016

SMG-3016 standard delivery package includes: 

• SMG-3016 digital gateway;
• A mounting set for 19″ rack;
• Technical passport;
• User manual on CD (optional).

Safety instructions

General guidelines

Any operations with the equipment should comply to the Safety Rules for Operation of Customers' Electrical Installations. 

Before operating the device, all engineers should undergo special training.

The device should be connected only to properly functioning supplementary equipment.

The digital gateway can be permanently used provided the following requirements are met: 

• Ambient temperature from 0 to +40 °C;
• Relative humidity up to 80 % at +25 °C;
• Atmosphere pressure from 6,0 × 10*4 to 10,7 × 10*4 Pa (from 450 to 800 mm Hg).

The device should not be exposed to mechanical shock, vibration, smoke, dust, water, and chemicals.

To avoid components overheating which may result in device malfunction, do not block air vents or place objects on the equipment. 

Electrical Safety Requirements 

Prior to connecting the device to a power source, ensure that the equipment case is grounded. The grounding wire should be securely connected to the ground connection point. The resistance between theground connection point and grounding busbar should be less than 0.1 Ohm.

PC and measurement instruments should be grounded prior to connection to the device. The potential difference between the equipment case and the cases of the instruments should be less than 1 V.

Prior to turning the device on, ensure that all cables are undamaged and securely connected.

Make sure the device power sources are off, when installing or removing the case.

Installation and removal of submodules should only be carried out with the power off, following the section Power module installation.

Electrostatic Discharge Safety Measures 

In order to avoid failures caused by electrostatic discharge, it is strongly recommended to wear ESD belt, shoes or wrist strap to prevent electrostatic charge accumulation (if the wrist strap is used, make sure it fits tightly against the skin), and to ground the cord before operating the equipment. 

Power Supply Requirements 

Power supply type requirements 

The device should be powered from 48 V DC power supply with grounded positive potential or from the remote 220 V AC power supply.

Permissible voltage variation requirements for DC power supply  

Permissible variations of 48 V DC power supply voltage are from 36 V to 72 V.

When the power supply voltage is restored after being below the permissible threshold, the device specifications will be restored automatically. 

Permissible interference requirements for DC power supply 

The equipment should operate normally, when the power supply interference is below the values listed in the table below. 

Table 16 — Permissible interference requirements for DC power supply 

Requirements to interference produced by equipment in power supply circuit 

Voltage values of interference produced by the equipment in the power supply circuit should not exceed values listed in the table below.

Table 17 – Requirements to interference produced by equipment in power supply circuit 

AC power supply requirements 

AC power supply parameters should be as follows: 

• Maximum allowed voltage — 220 V;
• AC power supply should feature residual current device (RCD);
• Insulation strength of AC power supply circuits against the housing should withstand at least 1000 V peak (in normal conditions). 

SMG installation

Check the device for visible mechanical damage before installing and turning it on. In case of any damage, stop the installation, fill in a corresponding document and contact your supplier. 

The device should be installed on premises with access restricted only to service personnel. 

If the device was exposed to low temperatures for a long time before installation, leave it for 2 hours at room temperature prior to operation. If the device was exposed to high humidity for a long time, leave it for at least 12 hours in normal conditions prior to turning it on. 

Mount the device. The device is intended to be installed into 19" rack using the mounting set or mounted on the horizontally oriented perforated shelf. 

After installation, ground the device case. This should be done prior to connecting the device to the power supply. An insulated multiconductor wire should be used for grounding. The device grounding and the grounding wire section should comply with Electric Installation Code. The ground connection point is located at the right bottom corner of the rear panel, see figure 14, figure 16, figure 18.

Stratup sequence

1. Connect digital streams, optical and electrical Ethernet cables to corresponding gateway connectors. 

   To protect digital streams from extraneous voltages, the linear side of the cross-connect should be equipped with integrated protection devices. It is recommended to use KRONE complex protection plugs “Com Protect 2/1 CP HGB 180 A1”.

   
   

2. Connect the power supply cable to the device. To connect the device to DC power supply, use the cable with cross-section not less than 1 mm².
3. If a PC is supposed to be connected to SMG console port, connect SMG console port to PC COM port. PC should be powered off and grounded at the same point with the digital gateway. 
4. Ensure that all cables are undamaged and securely connected. 
5. Turn the device on and check the front panel LEDs to make sure the terminal is in normal operating conditions. 

Support brackets mounting

The delivery package includes support brackets for rack installation and mounting screws to attach brackets on the device case. 

Figure 19 – Attaching support brackets for SMG-1016M (left top), SMG-2016 (right top) and SMG-3016 (bottom) 

To install the brackets:

1. Align four mounting holes in the support bracket with the corresponding holes in the side panel of the device, figure 19.
2. Use a screwdriver to screw the support bracket to the case.

Repeat steps 1 and 2 for the second support bracket. 

Device rack installation

To install the device to the rack:

1. Attach the device to the vertical guides of the rack. 
2. Align mounting holes in the support bracket with the corresponding holes in the rack guides. Use the holes of the same level on both sides of the guides to ensure the device horizontal installation. 
3. Use a screwdriver to screw the device to the rack 

To dismount a device, disconnect cables and remove support bracket screws from the rack. Remove the device from the rack. 

Figure 20 – Device rack installation for SMG-1016M (left top), SMG-2016 (right top) and SMG-3016 (bottom) 

Power module installation

Device can operate with one or two power modules. The second power module installation is necessary when the device operates under strict reliability requirements. 

From the electric point of view, both places for power module installation are identical. In the context of device operation, the power module located closer to the edge is considered as the main module, and the one closer to the center — as the backup module. Power modules can be inserted and removed without powering the device off. When additional power module is inserted or removed, the device continues operation without reboot. 

The device has two fuses with nominal current 3.15 A. The fuses are not user-serviceable. They should be replaced by the qualified service specialists in the manufacturer's service center. 

Figure 21 – Power module installation

Removing the housing

First, disconnect SMG from the power supply, disconnect all the cables and remove the device from rack if necessary (see Device rack installation).

Figure 22 – SMG-1016M housing removal procedure

Figure 23 – SMG-2016 housing removal procedure

Figure 24 – SMG-3016 housing removal procedure

1. Use a screwdriver to remove support brackets from the device housing. 
2. For SMG-1016M only: it is necessary to untwist the fixing screws of the front panel, then pull it until it separates from the top and side panels (figure 22).
3. Untwist the screws on the top panel.
4. Pull the top panel of the device to remove it. 

For the device assembly, repeat all mentioned steps in the reverse order.

Figure 25 – Types of screws used for SMG assembly

The figure above shows types of screws used for device assembly into the housing:

1. Support brackets mounting for rack installation.
2. Housing parts mounting.
3. Board, ventilation unit, covers, guides mounting.
4. Tan mounting screw.
5. Grounding screw.

Figure 26 – SMG assembly into housing

Submodule installation

Device features modular design and may accommodate up to 6 × IP submodules IP SM-VP-M300 (Submodule MSP) and up to 4 × E1 stream submodules (Submodule C4E1) in slots shown in the figures below.

The device requires at least one SM-VP-M300 module to operate. The required quantity of submodules for full operation of the device is calculated based on the required number of E1 streams, active VoIP channels (taking into account the codecs used) and the presence of SORM. 

Figure 27 – SMG-1016M submodule location 

Figure 28 – SMG-2016 submodule location

Figure 29 – SMG-3016 submodule location

SMG submodule installation order: 

1. Check if the device is powered on. 

2. If the voltage is present, disconnect the power supply. 

3. Remove the device from the rack if necessary (see section Device rack installation).

4. Remove the device housing (see section Removing the housing).

5. In some hardware revisions, submodules are covered with specially shaped plates to prevent submodules from falling out during transportation (see section Removing the housing, figures 22, 23, 24). In this case, the plate should be removed.

6. Install the module into the empty position (see figures 27, 28, 29).

6.1 Install washers on the board, install brass standoffs on them. 

6.2 Install the submodule onto the brass standoffs, making sure that the connectors are tightly connected to the submodule.

6.3 Fix the module using the screws.

  Figure 30 – Submodule installation on the board

6.4 Install the module on the board, making sure that the connectors are tightly connected to the submodule. 

6.5 Secure the submodule using sealant to fix the submodule on the board.

 Figure 31 – Submodule installation on the board 

7. For the positions of C4E1 submodules, the following correspondence is established with the numbers of E1 streams: 

For SMG-1016M

• Submodule C4E1 0 – E1 Stream 0-3;
• Submodule C4E1 1 – E1 Stream 4-7;
• Submodule C4E1 2 – E1 Stream 8-11;
• Submodule C4E1 3 – E1 Stream 12-15.

For SMG-2016

• Submodule C4E1 1 – E1 Stream 0-3;
• Submodule C4E1 2 – E1 Stream 4-7;
• Submodule C4E1 3 – E1 Stream 8-11;
• Submodule C4E1 4 – E1 Stream 12-15.

For SMG-3016

• Submodule C4E1 1 – E1 Stream 1-4;
• Submodule C4E1 2 – E1 Stream 5-8;
• Submodule C4E1 3 – E1 Stream 9-12;
• Submodule C4E1 4 – E1 Stream 13-16.

8. Remount the restrictor plates above the submodules (if any), assemble the housing, install the device into the rack (if required). 

Installation of ventilation units

The device design allows replacing the ventilation units even when the power is on. 

Figure 32 – SMG-1016M ventilation unit. Installation into case 

Figure 33 – SMG-2016 ventilation unit. Installation into case 

Figure 34 – SMG-2016 rev.B. ventilation unit. Installation into case

Figure 35 – SMG-3016 ventilation unit. Installation into case 

To remove a ventilation unit, perform the following actions: 

1. Use a screwdriver to remove the right screw connecting the ventilation unit with the rear panel. 
2. Carefully pull the unit until it is removed from the case.  
3. Disconnect the unit from the terminal socket, figure 36.

Figure 36 – SMG-1016M ventilation unit connector 

To install a ventilation unit, perform the following actions:

1. Connect the unit to the terminal connector. 
2. Insert the unit into the device case. 
3. Screw the ventilation unit to the rear panel. 

SSD installation for SMG-1016M

Figure 37 – SSD installation procedure

Figure 38 – SSD mounting procedure 

1. Check if the device is powered on 
   
2. If the voltage is present, disconnect the power supply. 
3. Remove the device from rack if necessary (see section Device rack installation).
4. Remove the device housing (see section Removing the housing).
5. If there is no mounting pin (see figure 37), on the device board, use the removable stand: 
   а. Mount the SSD onto the fixing stand; 
   b. Remove the liner from the adhesive layer of the fixing stand. 
6. Install the drive into a vacant slot (2 slots are available in total — see figure 37), and if there is a mounting pin on the board, fasten the drive with a screw (see figure 38).

To remove the SSD, repeat all mentioned steps in the reverse order. 

SATA drive installation for SMG-2016, SMG-3016

SATA drives may be additionally included in the device delivery package. Connection slot is designed for 2.5" drives with a thickness of up to 12.5 mm". 

Installation of SATA drives: 

1. Remove the drive tray from the device housing (figure 15, figure 17 element 1. To do this, press the button on the right until the ejector knob is released, pull the knob to remove the drive tray from the housing. 
2. Remove the mounting kit located under the ejector knob, figure 39;
3. Fix the drive in the tray, figure 40;
4. Insert the tray with the SATA drive installed back into slot and push the ejector knob until it fits with a click, figure 41.

To remove the SATA drive, repeat all mentioned steps in the reverse order.

SATA drives can be installed/removed when the device is powered on. 

Figure 39 – Mounting kit location 

Figure 40 – Mounting SATA drive into drive tray 

Figure 41 – Installation of SATA drive into device case 

RTC battery replacement

RTC (electric circuit designed for automatic chronometric data metering — current time, date, day of the week, etc.) located on the device board has a battery which specifications are listed in the table below.

Table 18 — RTC battery specifications

Figure 42 – RTC battery location for SMG-1016M 

Figure 43 – RTC battery location for SMG-2016

Figure 44 – RTC battery location for SMG-3016

If the battery lifetime is expired, replace it with a new one to ensure correct and continuous operation. The replacement procedure as follows: 

1. Check if the device is powered on. 
2. If the voltage is present, disconnect the power supply. 
3. Remove the device from rack if necessary (see section Device rack installation).
4. Remove the device housing (see section Removing the housing).
5. Remove used battery (figures 42, 43, 44) and install a new one into the same position. 

For the device assembly, repeat all mentioned steps in the reverse order. 

General switch operation guidelines

The easiest way to configure and monitor the device is to use the web configurator, so it is recommended to use it for these purposes. 

In order to prevent an unauthorized access to the device, it is recommended to change the password for Telnet and Console access (default username: admin, password: rootpasswd) and administrator password for web configurator access. For setting password for Telnet and Console access, see section Change device access password via CLI. For setting password for web configurator access, see section Management. It is recommended to write down and store defined passwords in a safe place, inaccessible by intruders. 

In order to prevent device configuration data loss, e.g. after reset to factory configuration, it is recommended to make configuration backup copies and store them on a PC each time significant changes are made.