ETHERLINK II - Repeater Manual
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S-Access ETHERLINK_II Repeater
REPEATER DEVICES
TECHNICAL DESCRIPTION AND OPERATIONS MANUAL
Version 1.1
Document name _SAUM_SA_ETHERLINK_II_XX_Reg_V1-1_080123
Revision 23. January 2008
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© Copyright ©2008 by S-Access GmbH. The content of this publication may not be reproduced
in any part or as a whole, transcribed, stored in a retrieval system, translated into any
language, or transmitted in any form or by any means, electronic, mechanical, magnetic,
optical, chemical, photocopying, manual, or otherwise, without the prior written permission of
S-Access GmbH. Published S-Access GmbH. All rights reserved.
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VERSION CONTROL................................................................................................................. 7
SAFETY REGULATIONS .......................................................................................................... 7
EU DIRECTIVE 2002/96/EC AND EN50419 .............................................................................. 7
1 SELECTION GUIDE ........................................................................................................... 9
2 INTRODUCTION ............................................................................................................... 10
3 TECHNICAL DESCRIPTION ............................................................................................ 11
3.1 Application and general information about S-Access Etherlink_II devices .................. 11
3.2 Main features of S-Access Etherlink_II devices .......................................................... 13
3.3 PL and RL devices ..................................................................................................... 13
3.4 IP-67 devices ............................................................................................................. 17
3.5 Remote power supply, wetting current- supply and consumption modes .................... 19
3.5.1 Electrical safety regulations when using the remote power supply ...................... 19
3.5.2 Compatibility of wetting current supply and remote power supply modes ............ 19
3.5.3 Remote power feeding ........................................................................................ 19
3.5.4 Remote power Pass-through mode ..................................................................... 20
3.5.4.1 Jumper Settings V56 unit ............................................................................. 20
3.5.4.2 Jumper Settings V58 unit ............................................................................. 21
3.6 Description of S-Access Etherlink_II interfaces .......................................................... 22
3.6.1 xDSL interface..................................................................................................... 22
3.6.1.1 Master/Slave/Auto ........................................................................................ 22
3.6.1.2 Multipair modes ............................................................................................ 23
3.6.1.3 Reservation .................................................................................................. 25
3.6.1.4 Automatic configuration of a link ................................................................... 29
3.6.2 Ethernet interface ................................................................................................ 31
3.6.3 An integrated switch of 64-kbit/s time slots .......................................................... 34
3.6.3.1 E1 mode (transmission of only time slots of E1 streams) ............................. 34
3.6.3.2 Mode of simultaneous transmission of time slots of E1 and Ethernet data ... 35
3.6.4 Test loops ........................................................................................................... 37
3.6.4.1 Analog Loopback ......................................................................................... 37
3.6.4.2 Performance monitoring ............................................................................... 38
3.6.4.3 G.826 performance monitoring ..................................................................... 38
3.6.5 BERT test ............................................................................................................ 39
3.7 Alarm indication .......................................................................................................... 39
3.7.1 LEDs ................................................................................................................... 39
3.7.2 Alarm LEDs ......................................................................................................... 41
3.8 Management of S-Access Etherlink_II devices ........................................................... 43
3.8.1 Management of S-Access Etherlink_II with RS232 interface ............................... 43
3.8.2 Management of S-Access Etherlink_II with Ethernet interfaces ........................... 43
3.8.2.1 Telnet ........................................................................................................... 43
3.8.2.2 WEB ............................................................................................................. 43
3.8.2.3 SNMP .......................................................................................................... 47
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4 PROGRAMMING GUIDE .................................................................................................. 48
4.1 Command structure .................................................................................................... 48
4.2 Etherlink_II software ................................................................................................... 50
4.3 Configuration storage and application ........................................................................ 50
4.4 Groups of commands requiring confirmation .............................................................. 53
4.5 Command syntax ....................................................................................................... 54
4.6 Commands ................................................................................................................. 54
4.6.1 Main Menu .......................................................................................................... 54
4.6.1.1 System invitation .......................................................................................... 54
4.6.2 General Commands ............................................................................................ 55
4.6.2.1 <H> command ............................................................................................. 55
4.6.2.2 <LINKCLEAR> command ............................................................................ 55
4.6.3 Performance management menu ........................................................................ 55
4.6.3.1 <H> command ............................................................................................. 55
4.6.3.2 <TCPIP> command ...................................................................................... 56
4.6.3.3 <MAC> command ........................................................................................ 57
4.6.3.4 <G826> command ....................................................................................... 58
4.6.3.5 <RESETG826> command ............................................................................ 58
4.6.3.6 <NETSTAT> command ................................................................................ 59
4.6.3.7 <RESETNETSTAT> command .................................................................... 59
4.6.3.8 <M> command ............................................................................................. 59
4.6.3.9 <H> command ............................................................................................. 59
4.6.4 Fault and maintenance management menu ........................................................ 60
4.6.4.1 <H> command ............................................................................................. 60
4.6.4.2 <NM> command........................................................................................... 61
4.6.4.3 <STATUS> command .................................................................................. 61
4.6.4.4 <STATUS ETH> command .......................................................................... 62
4.6.4.5 <MACTABLE> command ............................................................................. 62
4.6.4.6 <ALARM> command .................................................................................... 63
4.6.4.7 <AСO [GROUP ON/OFF])> command ......................................................... 64
4.6.4.8 <STARTAL ON/OFF N> command .............................................................. 64
4.6.4.9 <RESTART [N=1..4]> command .................................................................. 66
4.6.4.10 <RESET> command .................................................................................... 66
4.6.4.11 <SOFTUPDATE> command ................................................................ ........ 66
4.6.4.12 <SOFTCONFIRM> command ...................................................................... 66
4.6.4.13 <SOFTINFO> command .............................................................................. 67
4.6.4.14 <APPLY /ALL/NET/VLAN/LINE/SNMP> command ...................................... 67
4.6.4.15 <CONFIRM> command ................................................................................ 67
4.6.4.16 <BACKUP> command.................................................................................. 68
4.6.4.17 <RESTORE> command ............................................................................... 68
4.6.4.18 <DIFF N/R/S/B N/R/S/B > command ............................................................ 68
4.6.4.19 <DUMP N/R/S/B > command ....................................................................... 69
4.6.4.20 <LOAD> command ...................................................................................... 70
4.6.4.21 <POWERMODE [0..5]> command ............................................................... 70
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4.6.4.22 <SENSOR > command ................................................................................ 70
4.6.4.23 <SENSOR [N=1-3] [O/C]> command ........................................................... 70
4.6.5 Configuration Management menu ....................................................................... 71
4.6.5.1 <H> command ............................................................................................. 71
4.6.5.2 <CONFIG> command .................................................................................. 72
4.6.5.3 <CONFIG R/N/S/B> command ..................................................................... 72
4.6.5.4 <MASTER ON/OFF/AUTO N> command ..................................................... 73
4.6.5.5 <BASERATE K/AUTO [N=1..4]> command .................................................. 73
4.6.5.6 <PAM 16/32 [N]> command ......................................................................... 74
4.6.5.7 <ANNEX A/B/AB [N=1..4]> command .......................................................... 74
4.6.5.8 <PASSWORD USER/ADMIN> command .................................................... 74
4.6.5.9 <ID N> command ......................................................................................... 74
4.6.5.10 <DEFAULT> command ................................................................................ 74
4.6.5.11 <DEFAULT EVERYTHING> command ........................................................ 75
4.6.5.12 <PAYLOAD list/NONE [N=1..4]> command ................................................. 75
4.6.5.13 <SERNUM> command ................................................................................. 75
4.6.5.14 <WAN> command ........................................................................................ 75
4.6.5.15 <GSCOMPAT> command ............................................................................ 76
4.6.5.16 <NET> command ......................................................................................... 76
4.6.5.17 <H> command ............................................................................................. 76
4.6.5.18 <NETCONFIG [R/N/S/B]> command ............................................................ 77
4.6.5.19 <INTERFACE NAME COMMAND PARAM > command ............................... 78
4.6.5.20 <ETHSD 10/100/AUTO H/F [N=1..4]> command ......................................... 79
4.6.5.21 <SLICING SIZE> command ......................................................................... 79
4.6.5.22 <SETIP X.X.X.X> command......................................................................... 80
4.6.5.23 <GATEWAY X.X.X.X> command ................................................................. 80
4.6.5.24 <NETMASK X.X.X.X> command .................................................................. 80
4.6.5.25 <VID> command .......................................................................................... 80
4.6.5.26 <TRAPIP ADD/DEL X.X.X.X> command ...................................................... 80
4.6.5.27 <COMMUNITY> command .......................................................................... 80
4.6.5.28 <SNMPSET ON/OFF> command ................................................................. 80
4.6.5.29 <NETDEFAULT> command ......................................................................... 81
4.6.5.30 <M> command ............................................................................................. 81
5 SOFTWARE DOWNLOADING ......................................................................................... 82
5.1 Software loading via the RS232 port with the help of the Flash Loader program ........ 82
5.2 Software loading via the COM port (the 1K Xmodem protocol) ................................... 86
5.3 Software loading via Ethernet (1K-Xmodem and Telnet) ............................................ 91
6 SERVICE INSTRUCTIONS ............................................................................................... 92
6.1 General requirements ................................................................................................. 92
6.2 Evaluation of the quality of the digital channel and operation parameters ................... 93
7 APPENDICES ................................................................................................................... 94
7.1 Example 1 of configuration of Etherlink_II devices ..................................................... 94
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7.1.1 Configuration of the S-Access Etherlink_II device at the Central Office premises.
94
7.1.2 Configuration of the S-Access Etherlink_II device at the Customer Premises...... 95
7.1.3 Configuration of the S-Access Etherlink_II regenerator at the Regenerator Point.95
7.2 Example 2 of configuration of Etherlink_II devices ..................................................... 95
7.2.1 Configuration of the S-Access Etherlink_II device at the Central Office premises.
96
7.2.2 Configuration of the S-Access Etherlink_II device at the Customer Premises...... 97
7.2.3 Configuration of the S-Access Etherlink_II regenerator at the Regenerator Point.97
7.3 Connectors’ description .............................................................................................. 99
7.3.1 “Ethernet” connector ........................................................................................... 99
7.3.2 “G703” connector .............................................................................................. 100
7.3.3 “xDSL” connector RJ45 ..................................................................................... 100
7.3.4 “xDSL” connector XF19 ..................................................................................... 101
7.3.5 “Monitor” connector ........................................................................................... 102
7.3.6 “Monitor/TLM” connector XF4 ............................................................................ 102
7.3.7 “-48VDС” connector .......................................................................................... 103
7.3.8 “-48VDС” connector XF6 ................................................................................... 103
8 TECHNICAL SPECIFICATION ....................................................................................... 104
8.1 Interfaces ................................................................................................................. 104
8.1.1 xDSL Line Interface ........................................................................................... 104
8.1.2 E1 Line Interface ............................................................................................... 104
8.1.3 Monitor Interface ............................................................................................... 104
8.1.4 Ethernet ............................................................................................................ 104
8.2 Power Supply ................................ ................................................................ ........... 105
8.3 Environmental .......................................................................................................... 105
8.3.1 Climatic Conditions ........................................................................................... 105
8.3.2 Safety / EMC ..................................................................................................... 105
8.4 Physical Dimensions and Weight ................................................................ ............. 106
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VERSION CONTROL
User Manual
Versi
on
Date
Software
Version
Major changes to previous version
1.0
January2007
1.2.7
Initial version
1.1
May 2007
1.3.4
Modified 7.3.4 for 2wire repeaters
Actualized multipair topic
Included pass-through jumper setting for V58
SAFETY REGULATIONS
IF THE UNIT IS NOT USED IN ACCORDANCE TO REGULATIONS DESCRIBED AND DEFINED IN
THE CHAPTERS ”TECHNICAL DESCRIPTION” AND “TECHNICAL SPECIFICATIONS”, S-ACCESS
GMBH REFUSES TO TAKE ANY RESPONSIBILITY. FURTHERMORE, NO WARRANTY IS GRANTED
IN SUCH CASE!
ITS ONLY ALLOWED TO USE EXTERNAL POWER SUPPLIES THAT ARE APPROVED ACOORDING
TO THE SAFETY STANDARD IEC/EN 60950-1.
ITS ONLY ALLOWED TO USE A REMOTE DSL POWER SOURCE THAT HAS AN APPROVED TVN3
INTERFACE.
THE EARTH SCREW OF THE NTU UNIT HAS TO BE CONNECTED PERMANENTLY TO A RELIABLE
PROTECTIVE EARTH CONDUCTOR.
ALL IP UNITS HAVE TO BE CONNECTED PERMANENTLY TO A RELIABLE PROTECTIVE EARTH
CONDUCTOR.
INCORRECT USE OF THIS DEVICE, USE IN ANY OTHER ENVIRONMENT AND/OR HOUSING THAN
PROVIDED BY S-ACCESS MIGHT LEAD TO HARMFUL CONDITIONS. FAILURE TO FOLLOW THESE
PRECAUTIONS MAY RESULT IN DEATH, SEVERE INJURY OR PROPERTY DAMAGE.
Please read this manual carefully before operating the system.
Installation of this equipment has to be done by qualified personnel only.
EU DIRECTIVE 2002/96/EC AND EN50419
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This equipment is marked with the above recycling symbol. It means that at the end of the life of
the equipment you must dispose of it separately at an appropriate collection point and not place
it in the normal domestic unsorted waste stream. (European Union only)
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1 SELECTION GUIDE
REPEATER (ETHERLINK II), Ethernet Bridge
Standalone
DIN RAILMounting
2 wire (5,7Mb)
4 wire (11,4Mb)
Protected Housing
Nx64/RS232
Ethernet Bridge
Ethernet Add/Drop
Point to Point
48V-DC
Remotely powerable
Telnet Management
Web Management
Telnet Management
SNMP Management
SA-REP-ETHERLINK_II-1DA-PL
SA-REP-ETHERLINK_II-1DA-RL
SA-REP-ETHERLINK_II-1DA-IP67
SA-REP-ETHERLINK_II-2DA-PL
SA-REP-ETHERLINK_II-2DA-IP67
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2 INTRODUCTION
The present document describes devices of the S-Access Etherlink_II Repeater family. The
document contains the technical description of the devices, installation, configuration, and
operation instructions. Appendices containing additional information about the system are also
an integral part of the present document.
Warning!! Before starting operating the equipment, read carefully PART 5 of the present
document. The guarantee will not be granted to the device malfunctioning or damaged due to
failure to comply with the requirements stated in the Section related to “Service Instructions” of
the present document.
Warning!! An example of fast configuration of the equipment is described in Appendix 6.1 of the
present document.
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3 TECHNICAL DESCRIPTION
3.1 Application and general information about S-Access Etherlink_II devices
S-Access Etherlink_II devices represent xDSL modems (ITU-T G.991.2– G.shdsl and ITU-T
G.991.2 – G.shdsl.bis standards, TC-PAM line encoding). They are designed to organize highspeed data communication channels over symmetric digital subscriber lines (DSLs) with the
transmission rates from 200 to 5704 kbit/s (with the step of 64 kbit/s). The TC-PAM (Trellis
Coded Pulse Amplitude Modulation) encoding used in these devices well combines such
characteristics as the transmission range, noise immunity and electromagnetic operability. The
number of levels (code states) in TC-PAM is increased up to 32 and a special error correction
mechanism is used. To increase the distance range by 2 or more times, regenerators can be
used.
The family of S-Access ETHERLINK_II includes devices with G.703 and Ethernet network
interfaces. Thus, the S-Access ETHERLINK_II equipment provides complex services which
allow one to transmit simultaneously voice and data as well as to construct TDM networks of
different topologies without using expensive interface converter, multiplexers and cross-connect
systems.
The devices of this family include network termination units (NTUs) and line termination units
(LTUs), which are installed at the customer (user) premises and the operator (provider)
premises, respectively. In addition, the devices of this family include regenerators. To organize
the “point-to-point” topology, the following schemes can be used: NTU – NTU, LTU – LTU or
NTU –LTU.
The devices can be powered from local DC sources. Regenerators and NTUs can be fed both
locally or remotely from LTUs. Figure 1.1 presents an example of organization of data
transmission systems with the help of modems of the S-Access Etherlink_II family. Other
variants of the usage of this equipment are also possible.
О_ОП
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LTU
RGNo2
( remote
power)
RGNo2
( remote
power)
RGNo2
( local power) NTU
SHDSL SHDSL SHDSL
SHDSL
VLAN
Switch
Ethernet
Network
N2
Ethernet
Network
N1
Eth
ATS
G. 703 (E1)
G. 703 (E1)
ATS
Management PCVoIP
VLAN
Switch
Ethernet
Network
N2
Ethernet
Network
N1
Management PCVoIP
INTERNET
Repeater Point Repeater Point Repeater Point
ETHERLINK_II ETHERLINK_II
SA_RC_ETHERLINK_II_4DSL-4E1-4ETH
SA_RC_ETHERLINK_II_4DSL-4E1-4ETH
Figure 3.1 An example of organization of a data communication channel using S-Access
Etherlink_II modems
Notations in the figure:
ATS: a private automatic branch exchange;
E1: a 2048-kbit/s digital flow structured according to ITU-T Rec. G.704;
Management PC: a personal computer used to configure the system;
VLAN Switch: a switch of Ethernet packets supporting the VLAN function (IEEE 802.1q);
VoIP: devices of IP telephony (VOICE over IP);
Ethernet Network: local Ethernet network;
ETHERLINK_II LTU: S-Access ETHERLINK_II line termination unit;
ETHERLINK_II NTU: S-Access ETHERLINK_II network termination unit;
RGNo2: S-Access ETHERLINK_II regenerator.
The devices of this family have different mechanic designs: SubRack – a unit to be inserted into
a 19’’ AccessGain shelf; MiniRack – a 1U (44.5 mm) unit to be inserted into a 19’’ cabinet;
Stand Alone – a desktop unit; IP-67 – a unit in a water-proof plastic or silumin housing (class IP-
67); XCVR – a unit to be inserted into a hermetic steel housing.
The devices have the following possibilities for monitoring and management:
Local management and control of remote devices and regenerators – VT 100;
Local management and control of remote devices and regenerators – Telnet session;
Operation in complex networks under the unified management system – support of SNMP.
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The use of the Flash memory as the ROM provides an easy upgrade of the software.
xDSL modems are powered from a grounded primary DC source (38 … 78 V) or remotely.
Modems are designed to be used in-doors under the following environmental conditions:
- temperature of ambient air – from -5 … +45°C;
- relative air humidity – from 5% … 85% at +25°C.
3.2 Main features of S-Access Etherlink_II devices
S-Access Etherlink_II modems represent the next generation of modems of the S-Access
Etherlink family and have the following features:
1. A new type of line encoding – TC-PAM32 (TC-PAM16 is also supported).
2. Duplex data transmission over one symmetrical pair at 5.7 Mbit/s.
3. Simultaneous transmission of the TDM traffic and Ethernet data.
4. The 802.1q protocol.
5. Different ways of system configuration (for example, remote configuration of devices via
Telnet).
6. Embedded WEB interface.
7. The SNMP protocol.
8. Possibility of storing several configurations in the device’s EEPROM in order to download
the previous settings of the system.
9. Two levels of system users: administrator and user, protected with passwords.
10. The use of the modern circuit printed boards, chips and components.
11. Extended reliability of the equipment.
3.3 PL and RL devices
From the mechanic point of view, the device represents a case made of shockproof polystyrene
to withstand harsh environmental conditions, the case containing the basic elements of the
device. The power supply unit represents an external power supply in the form of a plug.
The front panel contains the following connectors and LEDs:
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Table 3.1 Connectors and LEDs of the Stand Alone devices.
Element
Description
DSL 1
A LED showing the status of the first line interface of the device
DSL 2
A LED showing the status of the second line interface of the device
Eth
A LED showing the status of the Ethernet port
G.703 1
A LED showing the status of the first E1 port
G.703 2
A LED showing the status of the second E1 port
Ethernet
An RJ45 connector for the connection of Ethernet + two LEDs
G.703
An RJ45 connector for the connection to the Е1 equipment + two LEDs
Monitor
A DB9 connector (female) for the connection to the control terminal
-48VDC
A connector for the connection to a primary DC source
LP/DP
A toggle of the power supply (local/remote)
xDSL
An RJ45 connector for the connection to the xDSL line + two LEDs
A grounding bolt
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Figure 3.2: Top- and front view SA_REG_ETHERLINK_II-1DA,V51 devices
Figure 3.3. Rear view SA_REG_ETHERLINK_II-1DA,V51 devices
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Figure 3.4. Top view SA_REG_ETHERLINK_II-1DA-RL,V51 devices
Figure 3.5. Front view SA_REG_ETHERLINK_II-1DA-RL,V51 devices
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3.4 IP-67 devices
The device represent a silumin or plastic housing containing the basic elements of the device.
The housing design corresponds to the IP-67 class (in accordance with IEC-60529). The
housing has two or three (for the plastic housing) cable inputs with stub cables for the
connection to xDSL lines, as well as two hermetic RJ-45 connectors, an M4 grounding bolt and
a LED for the silumin housing.
The regenerators in the silumin housing contain the following connectors and LEDs:
Table 3.2 Connectors and LEDs of simulin-housing regenerators.
Element
Description
“STATUS”
A LED
Ethernet
A hermetic RJ45 connector for the connection of Ethernet
Monitor/TLM
A hermetic RJ45 connector for the connection to the control terminal or
to the dry loop
M4 bolt
A grounding bolt
xDSL 1
1 and/or 3
A cable of the first and/or third xDSL line
xDSL 2
2 and/or 4
A cable of the second and/or fourth xDSL line
The regenerators in the plastic housing contain the following connectors and LEDs:
Table 3.3 Connectors and LEDs of plastic-housing regenerators.
Element
Description
DSL1
A LED showing the status of the first line
DSL2
A LED showing the status of the second line (for two-channel
regenerators)
Eth
A LED showing the status of the Ethernet port
G703 (above)
A LED showing the status of the first E1 port
G703 (below)
A LED showing the status of the second E1 port
A
A hermetic RJ45 connector for the connection to the control terminal or
to the dry loop
B
A hermetic RJ45 connector for the connection of Ethernet
Powering
Grounding
Output of the power cable (for locally powered devices) and
Grounding cable
xDSL 1
1 and/or 3
A cable of the first and/or third xDSL line
xDSL 2
2 and/or 4
A cable of the second and/or fourth xDSL line
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Figure 3.4 View of SA_REG_ETHERLINK_II-XDA-IP67 devices
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3.5 Remote power supply, wetting current- supply and consumption modes
The wetting current supply and remote power supply modes can be changed by using jumpers
and the management PC.
3.5.1 Electrical safety regulations when using the remote power supply
Despite the safe voltage on each wire with respect to the ground (<120 Volts), the use the
remote power supply requires one to observe strictly the following rules:
When working with lines and the a junction box, the xDSL cable should be disconnected
from the device supplying the remote power;
The insulation of cable pairs, junctions (junction boxes, plinths, etc.) should correspond to
norms and standards of the network;
3.5.2 Compatibility of wetting current supply and remote power supply modes
The table of compatibility of the wetting current supply and remote power supply modes is
presented below.
The devices operating in pairs should be configured for mutual operation (“” –
compatible). The use of the mode «-» is not recommended because it may cause: high power
consumption, degradation of communication (communication stability), the use of additional
safety measures. The mode “incompatible” (inc) will not allow the devices to establish
communication (because in this case one or both devices will be de-energized).
Wetting current supply
and remote power supply
modes
Regenerator
LTU
Remote
power
consumption
Local
Power
Remote
power
supply
Wetting
current
supply
Wetting
current
consumption
N
o
Regene-
rator
Remote
power
consumption
inc
inc
inc
inc
inc
No
inc
-
-
Warning! To prevent the FAILURE OF THE EQUIPMENT, the use of “X” modes IS STRICTLY
PROHIBITED!
Table 3.4 Compatible operation of remote power supply and wetting current supply modes.
3.5.3 Remote power feeding
Repeater devices can be configured to the local power supply and remote power supply modes
(LP/DP). The LP/DP modes are switched from one to another with the help of a toggle on the
rear panel of the device (see Figure 3.5).
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Figure 3.5. Position of the switch of LP/DP modes on the repeater board.
3.5.4 Remote power Pass-through mode
It’s possible to feed more than one repeater in series from a LTU with a remote power source.
To provide the Pass-trough option, you have to put Jumpers to XM2, XM3, XM4 and XM5.
3.5.4.1 Jumper Settings V56 unit
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3.5.4.2 Jumper Settings V58 unit
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3.6 Description of S-Access Etherlink_II interfaces
3.6.1 xDSL interface
The operation modes described below refer to the line interface of the device.
The S-Access ETHERLINK_II devices can have 1, 2 or 4 xDSL interfaces. The interfaces can
operate independently of each other.
All independent xDSL interfaces and groups of xDSL interfaces operating in the multipair mode
can be configured separately from the other xDSL interfaces. The multipair mode, the
reservation mode and the mode of automatic configuration detection naturally limit independent
functioning of the interfaces.
All interfaces support the plesiochronous data transmission. It means that reference clock
frequencies, which are used to clock data transmission, can transmit data in different directions
in one xDSL link.
The clock frequencies of different xDSL channels are completely independent if they do not
operate in the multipair mode.
If the xDSL channel is configured to operate in the independent mode (normal settings), it can
simultaneously transmit one or several E1 streams and one WAN stream. This transmission is
plesiochronous. All E1 streams received by one DSL interface should use the same clock
frequency in one direction.
Table 3.3 represents line settings in the independent mode.
Table 3.5 Line settings in the independent mode.
Mode
Coding type
Baserate
Data
transmissio
n rate
Standard
Manual
configuration,
Master, Slave
PAM16
3..60
Baserate* 64
kbit/s
Annex A, Annex B,
Annex AB
(autodetection)
PAM32
12..89
Autodetection,
Master
PAM16
Auto (3..60)
Annex AB
(autodetection)
PAM32
Auto (12..89)
Autodetection,
Slave
Auto
(PAM16,
PAM32)
Auto (3..89)
Annex AB
(autodetection)
3.6.1.1 Master/Slave/Auto
To establish a connection, it is necessary that one transceiver has to be a Master and the other
– a Slave. In this case, the connection is controlled by the Master device. The regenerator can
also automatically detect the “Master/Slave operation modes. In this mode, the regenerator
automatically detects from the side of which of line interface the Master device and the Slave
modem are located.
The MASTER ON/OFF command (the Configuration management menu) is used to configure
the Master/Slave operation modes.
ETHERLINK II - Repeater Manual
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3.6.1.2 Multipair modes
S-Access ETHERLINK_II regenerators support the multipair mode.
If 2, 3 or 4 DSL channels are configured to operate in the multipair mode, they function at the
same clock frequency and line rate as one DSL channel with doubled, tripled or quadrupled
transmission capacity. Similarly to the independent channel, such a combined channel can
simultaneously transmit one or several E1 streams and one WAN stream. This transmission is
plesiochronous. All E1 streams received by one DSL interface should use the same clock
frequency in one direction.
In the multipair mode, one xDSL channel serves as a Master channel, while the other xDSL
channels serve as Slave channels. If the link in one channel fails, links in all other channels
break too and the procedure of connection activation starts again.
The four-channel modems provide a possibility to organize pair-wise channels, i.e., these two
two-pair links will operate independently from each other.
The main application of the multipair modes is the increase in the transmission range. In this
case, some channels operate at low transmission rates. Limitations are imposed on the
baserate parameter in the multipair mode. These limitations are listed in Table 3.6
ETHERLINK II - Repeater Manual
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Table 3.6 Line configurations in the multipair mode.
Mode
Coding
type
Baserate
Data
transmission
rate
Standard
2-pair,
Manual configuration,
Master, Slave
PAM16
3..60
2*Baserate*
64 kbit/s
Annex A, Annex B, Annex
AB (autodetection)
PAM32
12..64
2-pair,
Autodetection,
Master
PAM16
Auto (3..60)
Annex AB (autodetection)
PAM32
Auto (12..64)
2- pair,
Autodetection, Slave
Auto
(PAM16,
PAM32)
Auto (3..64)
Annex AB (autodetection)
3- pair,
Manual configuration,
Master, Slave
PAM16
3..42
3*Baserate*
64 kbit/s
Annex A, Annex B, Annex
AB (autodetection)
PAM32
12..42
3- pair,
Autodetection,
Master
PAM16
Auto (3..42)
Annex AB (autodetection)
PAM32
Auto (12..42)
3-pair,
Autodetection, Slave
Auto
(PAM16,
PAM32)
Auto (3..42)
Annex AB (autodetection)
4- pair,
Manual configuration,
Master, Slave
PAM16
3..32
4*Baserate*
64 kbit/s
Annex A, Annex B, Annex
AB (autodetection)
PAM32
12..32
4- pair,
Autodetection,
Master
PAM16
Auto (3..32)
Annex AB (autodetection)
PAM32
Auto (12..32)
4- pair,
Autodetection, Slave
Auto
(PAM16,
PAM32)
Auto (3..32)
Annex AB (autodetection)
Figure 3.6 shows an example of organization of a four-pair operation mode. Four xDSL
channels are combined into one group of xDSL channels, though which a E1 stream and
Ethernet packets are transmitted. The use of this scheme involving the S-Access
ETHERLINK_II equipment allows one to increase the transmission range, compared to
the use of only one xDSL channel (the advantage in the transmission range will depend
on the cable parameters and noise immunity).
ETHERLINK II - Repeater Manual
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S-Access
Etherlink II
LTU
SA-PAM-SR2L-4E1B/4Eth-RP, V9
G. 703 (E1-1)
G. 703 (E1-1)
ATS
Customer Premises EquipmentCentral Office
ETH1
Ethernet
Network
S-Access
LTU
ETH1
Ethernet
Network
SA-PAM-SR4L-4E1B/4Eth-RP, V9
DSL2
DSL1
ATS
DSL4
DSL3
Etherlink II
Figure 3.6 Example of organization of a four-pair operation mode.
The <MULTIPAIR> command is used to configure this operation mode.
3.6.1.3 Reservation
Reservation is provisioned for 2- and 4-channel S-Access ETHERLINK_II devices.
The main task of reservation is to transmit the most important data even in the case of a failure
of one or several DSL connections (contingency). Reservation should also provide an efficient
use of the bandwidth for all DSL channels used by it in the normal mode.
Reservation is not aimed at continuous transmission of important data in the case of
contingencies. When one or several DSL connections fail, a sort-term loss of Ethernet packet
and E1 data can occur.
DSL channels with the successive numbers, for example, DSL1,DSL2, or DSL2,DSL3,DSL4,
are merged into a group of channels with reservation. For these channels the traffic with the
lowest numbers has higher priority than the traffic with higher numbers. For example, DSL1 has
a higher priority than DSL2, and DSL2, in turn, has a higher priority than DSL3.
In the normal mode, each channel transmits its own data as usual.
If communication is lost in one or several channels of the reservation group, other working
channels transmit data of high-priority channels. Therefore, in the case of contingency the
system always operates as if the low-priority channels failed.
Consider reservation with two DSL1 and DSL2 channels (DSL1 has a higher priority than
DSL2). If the DSL2 channel fails, the DSL1 channel continues to operate without any changes.
If the DSL1 channel fails, the DSL2 channel transmits the data of the DSL1 channel. Hence, the
DSL1 channel should transmit the high-priority data.
If the substitute channel has a lower transmission capacity than the main channel, the volume of
the data being transmitted over it will decrease. First, the volume of WAN data will decrease up
to 1 TS, then, the number of transmitted time slots of the E1 stream will decrease, E1 being at
the end of the list of E1 streams being transmitted (i.e., in the list E1-1, E1-2, the E1-2 stream
will be deleted). First, time slots with large numbers are deleted. However, there is an exception
for TS 16, which, if transmitted, will be deleted before or after TS 0.
ETHERLINK II - Repeater Manual
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Table 3.7presents examples of reservation with two channels:
Table 3.7 Examples of reservation with two channels.
Mode
Normal mode
DSL2 down
DSL1 down
DSL1
DSL2
DSL1
DSL2
DSL1
DSL2
DSL1: baserate 72,
DSL2:
baserate 61
E1-1,
40 TS
WAN
E1-2,
29 TS
WAN
E1-1,
40 TS
WAN
Failure
Failure
E1-1,
29 TS WAN
Total
E1-1, E1-2, 69 TS WAN
E1-1, 40 TS WAN
E1-1, 29 TS WAN
DSL1: baserate 72,
DSL2:
baserate 61
E1-1, E1-2,
8 TS WAN
61 TS
WAN
E1-1, E1-2,
8 TS WAN
Failure
Failure
E1-1,
28 TS E1-2, 1
TS WAN
Total
E1-1, E1-2, 69 TS WAN
E1-1, E1-2, 8 TS
WAN
E1-1, 28 TS E-12,
1 TS WAN
DSL1: baserate 72,
DSL2:
baserate 61
72 TS
WAN
E1-1,
29 TS
WAN
72 TS
WAN
Failure
Failure
61 TS WAN
Total
E1-1, 101 TS WAN
72 TS WAN
61 TS WAN
DSL1: baserate 89,
DSL2:
baserate 89
E1-1,
57 TS
WAN
E1-2, E1-3,
25 TS
WAN
E1-1,
57 TS
WAN
Failure
Failure
E1-1,
57 TS WAN
Total
E1-1, E1-2, E1-3,
82 TS WAN
E1-1, 57 TS WAN
E1-1, 57 TS WAN
Figure 3.7 illustrates an example of reservation for a two-channel system (according to the two
last rows in Table 3.7), X means a contingency:
Line rate over DSL1 and DSL2 is 89x64 kBit/s;
In the normal mode, the system transmits the E1-1 stream, WAN data (Ethernet) over DSL1
and E1-2, E1-3, WAN data (Ethernet) over DSL2;
The DSL1 interface has a higher priority compared to DSL2, therefore if communication in
the DSL2 channel fails (down), no reservation occurs (DSL1 Up, DSL2 Down);
In the case of a contingency at the DSL1 interface (for example, loss of signal), E1-1
streams and WAN are transmitted over the DSL2 link.
ETHERLINK II - Repeater Manual
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SA-PAM-SR2L-4E1B/4Eth-RP, V9
G. 703 (E1-1)
G. 703 (E1-1)
Customer Premises EquipmentCentral Office
ETH1
Ethernet
Network
ETH1
Ethernet
Network
SA-PAM-SR4L-4E1B/4Eth-RP, V9
DSL1
DSL2
G. 703 (E1-2)
G. 703 (E1-3)
ATS
G. 703 (E1-2)
G. 703 (E1-3)
ATS
SA-PAM-SR2L-4E1B/4Eth-RP, V9
G. 703 (E1-1)
G. 703 (E1-1)
Customer Premises EquipmentCentral Office
ETH1
Ethernet
Network
ETH1
Ethernet
Network
SA-PAM-SR4L-4E1B/4Eth-RP, V9
DSL1
DSL2
G. 703 (E1-2)
G. 703 (E1-3)
G. 703 (E1-2)
G. 703 (E1-3)
ATS
ATS
X
X
X
X
X
E1-1, 57 TS WAN ( ETH1)
Transmitted via DSL1
E1-2, E1-3, 25 TS
WAN ( ETH1)
Transmitted via DSL2
Normal Mode
DSL1 Up, DSL2 Down
E1-1, 57 TS WAN
Transmitted via DSL1
Nothing transmitted
via DSL2
SA-PAM-SR2L-4E1B/4Eth-RP, V9
G. 703 (E1-1)
G. 703 (E1-1)
Customer Premises EquipmentCentral Office
ETH1
Ethernet
Network
S-Access
LTU
ETH1
Ethernet
Network
SA-PAM-SR4L-4E1B/4Eth-RP, V9
DSL1
DSL2
G. 703 (E1-2)
G. 703 (E1-3)
G. 703 (E1-2)
G. 703 (E1-3)
ATS
ATS
X
X
X
X
X
DSL1 Down, DSL2 Up
Nothing transmitted
via DSL1
E1-1, 57 TS WAN
Transmitted via DSL2
Etherlink II
S-Access
Etherlink II
LTU
S-Access
Etherlink II
LTU
S-Access
Etherlink II
LTU
S-Access
Etherlink II
LTU
S-Access
Etherlink II
LTU
ETHERLINK II - Repeater Manual
Page 28 of 106
Figure 3.7 Example of reservation.
At the same time, while for a two-channel system the replacement of channels is trivial in the
case of contingency, in tre- and four-channle systems different variants are possible. However,
any system with the reservation mode follows a strict logic of channel substitution because by
default the system operates under conditions of incomplete data transmission, i.e., unreliable
communication. Therefore, below we present a table of channel reservation, which should be
used by all devices in the case of contingencies.
The table for four DSL channels is constructed based on the assumption that communication is
lost frequently in one channel, while communication in two channels occurs less frequently. In
this case, loss of communication occurs successively, i.e., first one channel fails and then the
other channel fails. Therefore, following the rules of channel substitution will allow one to
minimize the number of channel substitutions (especially high-priority channels) in cases of
contingencies. This will minimize the losses of data during channel switching. Tables for two
and three channels are based on the same assumption, but they are simpler.
DSL1
DSL2
DSL1
DSL2
DSL3
DSL1
DSL2
DSL3
DSL4
1 2 1 2 3 1 2 3 4 1 Down
1 2 Down
1 2 3
Down
Down
1 1 Down
2 1 2
Down
3 1 Down
Down
Down
2
Down
Down
Down
2 1 1
Down
3 2 Down
1
Down
1
Down
2
Down
Down
Down
1 1 Down
. 2 1
Down
Down
Down
Down
2 3 1
Down
2 1 Down
Down
2
Down
1
Down
1
Down
Down
Down
Down
2 1 Down
Down
1
Down
Down
Down
Down
1
Figure. 3.8 Examples of reservation of systems with two, three and four xDSL channels.
The <RESERVE> command is used to configure reservation.
ETHERLINK II - Repeater Manual
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3.6.1.4 Automatic configuration of a link
S-Access ETHERLINK_II devices allow one to configure the link in accordance with the Master-
modem configuration. This mode is available for the following links:
Point-point single-channel links;
Point-point multichannel links with independent channels;
Star-topology multichannel links;
Point-point multipair links;
Point-point two-channel two-pair links;
Star-topology two-pair links;
Links with regenerators.
Note: Automatic configuration of link reservation is not supported.
When the automatic configuration is used, the Slave modems and regenerators receive nearly
all configuration parameters for DSL and E1 from the link. In a majority of cases they require
minimum configurations, which allows one not duplicate manually configurations to all other
devices in the link. Such configurations as the number of E1 time slots transmitted over DSL,
CRC4 and G704 modes should not be configured on all devices because they are received
automatically from the link.
The system of automatic configuration operates as follows:
The CP side (Slave) automatically adjusts so that to correspond to the stream structure
received from the CO side (Master), and not to cause permanent losses of user data;
If the CP side (Slave) cannot adjust correspondingly, it displays a RCONF alarm and sends
a message to the remote terminal device. If configurations of terminal devices (Master and
Slave) do not coincide, the RCONF alarm is displayed. RCONF stands for remote urgent
alarm.
The link is adjusted to the channel structure in the direction from the Master to the Slave:
The stream structure is configured on the Master device;
The regenerator, which the next in the link, receives this structure and configures itself
according to it;
The next regenerator receives the structure from the previous regenerator and performs
configuration according to it;
The Slave device receives the stream structure from the regenerator, which the last one in
the link, and also performs configuration;
When the Slave device receives configuration, it distributes the received E1 streams to its
E1 ports. If the number of ports is not enough, it displays the RCONF alarm and does not
change the configuration of E1 streams. If the E1 streams are not distributed, the Slave
device receives configurations of WAN. Therefore, the integrity of the Ethernet link is
supported.
The RCONF alarm (which is displayed by the <ALARM> command and stands for the remote
urgent alarm) means that the local and remote equipment have incompatible configurations.
ETHERLINK II - Repeater Manual
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The RCONF alarm is automatically not displayed if a DSL link, in which it was detected, fails.
If the device operates in the CA mode (automatic configuration of a link), the alarm is not
displayed when the device finally adjusts to the CO side (Master).
We consider several examples of automatic configuration of the S-Access ETHERLINK_II
system.
Four fractional E1 streams and Ethernet data are transmitted over one DSL link.
Figure. 3.9 Example No. 1 of automatic configuration of a link
The next example shows the start topology. The Master device is the center of the star, while
the rays, represented by the Slave devices, are configured automatically.
Figure 3.10 Example No. 2 of automatic configuration of a link
A more complex case is the independent two-channel connection: two E1 streams and Ethernet
packets are transmitted in the first channel and the second channel. The Slave device
determines the order of E1 interfaces for the streams from each DSL link only when
communication in both links is established.
Master
E1-4
E1-3
E1-2
E1-1
Eth
Slave
E1-3
E1-2
E1-1
Eth
E1-4
Payload:
Eth (top)
E1-4
E1-3
E1-2
E1-1 (bottom )
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