Sigrand SG-16G User Manual

SIGRAND

SHDSL modem

Sigrand SG-16G

User's Guide

v. 2.4

Novosibirsk

2006

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© 2005, 2006 Sigrand LLC

All trademarks and registered trademarks mentioned hereinafter are the
property of their respective owners.

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Contents

Contents page
How to use this Guide 5

1. Modem description 7

1.1 DSL interface specifications 8

1.1.1 Maximum reach performance 8

1.2 E1 interface specifications 9

1.3 RS-232C interface specifications 10

1.4 Power supply unit 10

1.5 Miscellaneous data 10

1.6 Shipment contents 10

1.7 Environmental specifications 11

1.8 Appearance, controls, indicators and connectors 11

1.8.1 Front panel and indicators 11

1.8.2 Rear panel and connectors 12

2. Modem setup directions 15

2.1 Connecting modem to a line 15

2.1.1 Requirements to a communication line 15

2.2 Choosing modem management method 16

2.3 ”Master”/”slave” mode 16

2.4 Setting DSL rate 16

2.4.1 Rate selection guidelines 17

2.4.2 Automatic rate selection 17

2.5 E1 interface setup 17

2.5.1 Connecting E1 interface 17

2.5.2 Configuring Е1 interface 18

3. Modem management via console port 19

3.1 Terminal setup 19

3.2 General purpose commands 19
The help command 20

The info command 20
The stat command 21
The default command

21

The reboot command

21

3.3 DSL interface management 22

3

The help dsl command 22
The dsl command 22

3.3.1 “Master”/”slave” mode selection 23
The dsl master and dsl slave
commands

23

3.3.2 Setting DSL rate 23
The dsl rate command

23

3.3.2.1 Automatic rate selection 23
The dsl rate auto command

23

3.3.3 Line coding selection 24
The dsl code command

24

3.3.4 Link statistics 25
The dsl stat command 25

The dsl stat reset command 25

3.3.5 How to force a retrain 26
The dsl retrain command

26

3.4 Е1 interface management 26
The help e1 command

26

The e1 command

27

3.4.1 Long/Short Haul modes 27
The e1 short and e1 long commands

27

3.4.2 Framing modes and superframe options 27
The e1 framed and e1 /framed
commands

27

3.4.3 Е1 line coding 28
The e1 code command

28

3.4.4 Е1 interface statistics 29
The e1 stat command

29

3.4.5 Timeslot map 30
The e1 map command

30

3.4.5.1 Timeslot 0 33

3.4.5.2 Timeslot 16 33

3.4.6 E1 interface behavior in the Automatic DSL rate
selection mode

34

4. Updating built-in modem firmware 36

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How to use this Guide

To ease using this Guide the following notational conventions are provided
here ( icons as well as relevant fonts):

Icons

Icon Meaning Explanation



Pay attention!

The text marked by this icon contains
information making easy setup and
maintenance of equipment

Important

information!

The text marked by this icon contains
important information explaining
details of operation of equipment or
software. This allows to save your
time and efforts while equipment
setup.

Do not make this!

Knowing this information allow you to
avoid actions that can cause damage
to hardware and/or personal injury.

5

Font usage

Designation Explanation

Picture on the screen

This font shows contents of terminal
screen while modem setup.

Name of keyboard button

This font shows computer keyboard
buttons, e.g. ”Enter”, which are used
in the console management mode.

Select Property in the File menu

Italic notes the fragments of this

Guide containing important
information (together with the relevant
icons). It also marks software buttons
of menu in the text.

dsl stat

Bold font is used to designate

modem management commands
while a terminal session.



Before starting installation of the modem we recommend you
to look for a updated version of this User's Guide as well as
the firmware and the drivers available at our site
www.sigrand.com

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1. Modem description

The Sigrand SG-16G modem is a SНDSL-modem. It features an E1 system
interface (ITU-T G.703/G.704, 2048 kbps) and is intended to be used as a
line termination unit of TDM-based communication equipment. The modem
allows to make connections between devices equipped with E1 interfaces
such as telco equipment, routers and access servers.

The SHDSL interface of the modem conforms to ITU-T G.991.2.bis standard
and uses ТСРАМ (Trellis-Coded Pulse Amplitude Modulation) line coding.

Features of the ТСРАМ line coding:
The ТСРАМ line coding used by G.991.2 (G.SHDSL) compatible modems
has a few modes. The modes differ in complexity of coding algorithm. The
modes with larger number of modulation positions (ТСРАМ16, ТСРАМ32)
are applicable for higher rates, the modes with less number of modulation
positions (ТСРАМ4, ТСРАМ8) are applied for lower rates. Respectively, the
more complicated the coding algorithm the worse the channel noise
immunity and vice versa.
So take special attention to the ТСРАМ line coding algorithm selection while
configuring the line rate. It may be necessary to change the line coding to
achieve the best result.

Table 1 shows the line coding options and respective data rate ranges.

Table 1

Line coding Data rate range (kbps)

TCPAM32 256 – 2048
TCPAM16 192 – 2048

TCPAM8 192 – 1216
TCPAM4 64 – 704



Manual line coding selection is available only in the console
management mode – see chapter 3 of this Guide

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Compatibility:
The Sigrand SG-16G modem line coding is compatible with all Sigrand SG­16 series and Granch SBNI16 series modems.

The modem features the following interfaces:

• one SHDSL interface (conforms to ITU-T G.991.2.bis standard)

providing the data rate range from 64 to 2048 kbps.

• one Е1 interface (G.703/G.704, 2048 kbps).

• one EIA-232C (RS-232C) interface for modem management.

1.1 DSL interface specifications

Link type point-to-point
Number of wires per line 2 (one pair)
Permitted cabling any UTP
Line coding TCPAM

Input/output impedance, Ω

135

Data rate range, kbps 64-2048
Data rate step, kbps 64
Transmission type full duplex
Data transfer mode synchronous, by

packets
Packet type HDLC
Checksum type CRC32
Connector type RJ-45

Galvanic decoupling transformer breakdown
voltage, min, V

1500

Surge protector triggering voltage (differential), V 30
Arrester breakdown voltage (common-mode), V 350

1.1.1 Maximum reach performance

Brief information about the maximum reach performance of the Sigrand SG-

16G modem is shown on Table 2. The Bit Error Rate (BER) at the maximum
reach is equal to or less than 10-7. The specified reach is proved by testing
at the Sigrand lab reference line. Full version of the rate table is available at

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our site www.sigrand.com. An actual reach may vary against the shown
data due to variations of cable performance.

Table 2

Data rate

(kbps)

Line coding

Rating

TPP50-0.4

cable

(26 AWG)

TPP50-0.5

cable

(24 AWG)

2048 TCPAM16

Length (km/ft)

3.8/12400 5.6/18300

R (Ω)

1064 980

1536 TCPAM16

Length (km/ft)

4.4/14400 6.4/20100

R (Ω)

1232 1120

1024 TCPAM8

Length (km/ft)

5.0/16400 7.6/24900

R (Ω)

1400 1330

512 TCPAM8

Length (km/ft)

5.8/19000 9.0/29500

R (Ω)

1624 1575

256 TCPAM8

Length (km/ft)

6.6/21600 10.0/32800

R (Ω)

1848 1750

128 TCPAM4

Length (km/ft)

7.4/24200 11.4/37400

R (Ω)

2072 1995

64 TCPAM4

Length (km/ft)

7.4/24200 11.4/37400

R (Ω)

2072 1995

1.2 E1 interface specifications

Type of interface RJ-45, Balanced
Number of wires per line 4
Line coding HDB3, AMI
Data rate, kbps 2048

Maximum reach, km (ft)

TPP50-0.4 cable (26 AWG) 1.2 (3900)

TPP50-0.5 cable (24 AWG) 2.4 (7800)
Frame type G.704
Superframe types CRC4, CAS

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Unframed mode available

1.3 RS-232C interface specifications

Baud rate 9600, 57600
Protocol parameters 8-N-1
Flow control N/A
Connector type RJ-45 (DB-9F with converter)

1.4 Power supply unit

Type BPN-12-1V
Input voltage 220V/50Hz
Output voltage 12V
Maximum load current 1A
Polarity of the central contact of the connector positive

1.5 Miscellaneous data

Overall modem dimensions:

• height, mm/in.

45/1.77

• width, mm/in.

225/8.86

• depth, mm/in.

165/6.5

Weight, g/lb 450/1
Weight with PSU, g/lb 1050/2.32
Power consumption, W 6

1.6 Shipment contents

Sigrand SG-16G modem 1 pc.
Power supply unit 1 pc.
Guide 1 pc.
Cable with converter RJ-45-DB-9 1 pc.
Package 1 pc.

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1.7 Environmental specifications

The modem is designed to operate under office conditions as follows:

air temperature 10 .. 40 °C (50 .. 104 °F)
relative air humidity up to 85 %
atmosphere pressure 84 .. 107 kPa (630 .. 802

mmHg)

1.8 Appearance, controls, indicators and connectors

The Sigrand SG-16G modem can be connected to any equipment having
E1 interface such as telco equipment, routers and access servers.

The modem is manageable by switches placed on the rear panel as well as
by console management port (ch. 4.1). To manage the modem as well as to
monitor its status you should have an ANSI-compatible terminal emulation
software installed on your computer. Configure your terminal program
according to ch. 1.3 of this Guide.

1.8.1 Front panel and indicators

The front panel indicators display the status of device operation.

Figure 1

Purpose of Sigrand SG-16G indicators

Table 3

Indicator Status Explanation

POWER

POWER On

Modem is on

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Off Modem is off

DSL

LINK

On Active link to remote modem
Off No link to remote modem

SNR

LINK on

Blink Bad signal/noise ratio
Off Good signal/noise ratio

LINK off

Blink Link activation in progress
Off No link

ERR

LINK on

Blink

A packet with error
received

Off No error

LINK off On Fatal error

Е1

LINK

On Signal from Е1 equipment detected
Off No signal from Е1 equipment

SYNC

On Frame synchronization detected or

Unframed mode

Off Frame synchronization not detected

TEST

On Test mode
Off Operation mode

1.8.2 Rear panel and connectors

Layout of connectors and switches on the rear panel of the Sigrand SG-16G
modem

Figure 2

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Purpose of connectors and switches of the Sigrand SG-16G modem

Table 4

Power supply unit plug

9-12V DC

RS-232C console port for modem management

RS232

DSL line connector

DSL

Terminal to connect to protective ground

PGND

Dial to select fixed rate for DSL channel

RATE

DIP switches to set up modem operation mode

SET

Е1 interface socket

E1

Fig. 3

The “RATE” dial and the “SET” DIP switches (fig.3) specify operation mode
of the DSL channel. The dial sets a DSL channel data rate (fig.4).

Fig. 4

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