RCMS2401-30
Modular Ethernet Multiplexer
User Manual
(Rev. A)
Beijing Raisecom Science & Technology Co., Ltd
CONTENTS
CHAPTER 1 OVERVIEW ................................................................................................................................................... 1
1.1 Main Features.....................................................................................................................................................1
1.2 Part Number Explanation...................................................................................................................................1
CHAPTER 2 TECHNICAL SPECIFICATIONS........................................................................................................................3
2.1 E1 Interface Specification...................................................................................................................................3
2.2 Fast Ethernet Interface Specification..................................................................................................................3
2.3 Optical Interface Specification............................................................................................................................ 3
2.4 Ambience............................................................................................................................................................. 3
CHAPTER 3 CONFIGURATION GUIDE ............................................................................................................................... 4
3.1 Description of the Front Panel............................................................................................................................4
3.2 Dip-switch Setup.................................................................................................................................................5
3.2.1 SW1 for Working Modes................................................................................................................................................5
3.2.2 Fault-Pass-Through Capability Explanation ...................................................................................................................5
3.2.3 E1 Remote Loop-back Test ............................................................................................................................................6
3.2.4 How to Implement Remote Network Management.........................................................................................................6
CHAPTER 4 INSTALLATION AND TEST ............................................................................................................................. 7
4.1 Inspect after Opening.......................................................................................................................................... 7
4.2 Preparation before Installation...........................................................................................................................7
4.3 Installation .......................................................................................................................................................... 7
4.3.1 Connecting the Cables ....................................................................................................................................................7
4.3.2 Function Configuration...................................................................................................................................................8
CHAPTER 5 TROUBLESHOOTING ..................................................................................................................................... 8
APPENDIX A CABLE MAKING .........................................................................................................................................9
A.1 E1 Cable Making................................................................................................................................................9
A.2 Ethernet Cable Making....................................................................................................................................... 9
Beijing Raisecom Science & Technology Co., Ltd
Chapter 1 Overview
RCMS2401-30 Ethernet Multiplexers are fiber-optic transmission devices for dedicated
communication networks, data communication networks, switching networks, and also for
point-to-point networks, medium-sized and small capacity networks. It can multiplex one E1
channel and one Fast Ethernet on to one fiber-optic cable, and implement the wire-speed
transmission of the Ethernet data. RCMS2401-30 is featured by high integration and complete
network management functions. It can be installed into the Raisecom 3U-high 16-slot chassis, or
desktop single-slot chassis, providing various network management functions.
RCMS2401-30 Ethernet Multiplexers include the following models.
Model Description
RCMS2401-30-S1
Host-site/remote-site module, 10/100Mbps auto-sensing (RJ45), 120 Ohm balanced E1 (RJ45), single strand, single
mode(DSC), dual wavelength, 1310nm TX, 1550nm RX, 0-25 km
RCMS2401-30-S2
Host-site/remote-site module, 10/100Mbps auto-sensing (RJ45), 120 Ohm balanced E1 (RJ45), single strand, single
mode(DSC), dual wavelength, 1310nm TX, 1550nm RX, 10-60 km
1.1 Main Features
z Low power consumption due to extra large-scale ASIC chips; high reliability due to 4-layer
PCB
z Providing 1 E1 channel interface, transparent transmission mode
z Providing 1 10/100Mbps auto-sensing Ethernet interface
z Providing 1 optical interface, multiplexing E1 and Ethernet data together. 1310nm TX
wavelength
z Alarm indications of local and remote equipment
z Supporting E1 link remote loop-back function, easy fault location
z Supporting speed limit on both transmitting and receiving directions of Ethernet interface,
increment 32kbps
z Implementation of SNMP, capable of local and remote management. It is suggested that this
equipment be deployed at the host site to work in pairs with RCMS2501-30-FV35 or
RCMS2601-30 at remote site. Both host-site and remote-site network management can be
implemented.
1.2 Part Number Explanation
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Example
RC MS 2 4 01 – 30 – S2
Single mode optical interface, 10-60 km
1 E1 channel
1 Ethernet interface
Modular, single-strand fiber-optic
L2 Ethernet switching capability
Multi-service
Raisecom code (RC short for Raisecom)
Note: Equipments that can work in pairs
Host site Remote site
RCMS2401-30-S1 RCMS2601-30-S1, or RCMS2501-30-FV35-S1
Single-strand
fiber-optic
equipment
RCMS2401-30-S2 RCMS2601-30-S2 or, RCMS2501-30-FV35-S2
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Chapter 2 Technical Specifications
2.1 E1 Interface Specification
Bit rate: 2048Kbps±50ppm
Line code: HDB3
Interface impedance: 120Ω balanced signal
Electrical characteristic: Compliant to ITU-T G.703
Transfer characteristic: Compliant to ITU-T G.823
Jitter Tolerance: ITU-T G.724
2.2 Fast Ethernet Interface Specification
IEEE 802.3
IEEE 802.3u
IEEE 802.1d Spanning Tree
IEEE 802.1q VLAN
Support oversized Ethernet data frame up to 1916 bytes
Working mode: 10/100M Auto-Negotiation, Auto-MDI/MDIX (manual configurable)
Flow control: IEEE802.3x and back pressure
2.3 Optical Interface Specification
Bit rate: 150Mbps
Fiber connector: SC
Transmission distance: Single mode dual-strand S1=0 – 25 km, S2=10 – 60 km
2.4 Ambience
Working temperature: 0 ~ 45℃
Relative humidity: ≤ 90% (25℃)
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Chapter 3 Configuration Guide
3.1 Description of the Front Panel
The sketch of the RCMS2401-30 front panel
Optical Connector:
The optical interface type of RCMS2401-30 is SC/PC.
LAL (Local Alarm):
The red alarm indicator will be lightened when error occurs at local optical receiving direction.
It includes 4 alarm levels: lose of signal, lose of frame, BER exceeds 10
-3
, and BER exceeds
10
-6
. Users shall inquire the network management system for alarm details.
RAL (Remote Alarm):
The red alarm indicator will be lightened when error occurs at remote optical receiving (local
transmitting) direction. It includes 4 alarm levels: lose of signal, lose of frame, BER exceeds
10
-3
, and BER exceeds 10-6.
ETH Ethernet Interface:
RJ45 socket, unshielded twisted pair
LNK/ACT (Link/Action):
The green indicator will be lightened when the link is in normal condition. It flashes when
transmitting to receiving data.
100M (100Mbps):
The green indicator will be lightened when working at the rate of 100Mbps.
E1 Interface:
RJ45 socket, 120 Ohm balanced signal, Pin 1, 2 for output, and Pin 5, 6 for input
L/R LOS (Local/Remote Lose Signal):
The red alarm indicator will be lightened when E1 input loss of frame occurs at the local site; it
flashes when E1 input loss of frame occurs at the remote site.
Power Supply Indicator:
PWR (Power): the green indicator will be lightened when the power supply is in good condition
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1 2 3 4 5 6 7 8
OFF
ON
3.2 Dip-switch Setup
3.2.1 SW1 for Working Modes
SW1 is an 8-bit dipswitch, as the figure on the right
Switch OFF (default status) ON
1 Enable Ethernet interface auto-sensing Disable Ethernet interface auto-sensing
2 a) Ethernet forced 100M when
auto-sensing disabled
b)Invalid when auto-sensing enabled
a) Ethernet forced 10M when auto-sensing
disabled
b) Invalid when auto-sensing enabled
3 a) Ethernet forced full duplex when
auto-negotiation disabled
b) Ethernet forced full duplex when
auto-negotiation failed; invalid when
auto-negotiation success
a) Ethernet forced half duplex when
auto-negotiation disabled
b) Ethernet forced half duplex when
auto-negotiation failed; invalid when
auto-negotiation success
4 Reserved Reserved
5 Fault Pass Through disabled Fault Pass Through enabled
6 Enable MDI/MDIX auto-negotiation Disable MDI/MDIX auto-negotiation.
Straight-through cable shall be used to
connect to Switch; crossover cable shall be
used to connect to NIC and Routers
7 E1 link normal working mode E1 link remote loop-back
8 Auto recognition of network management
channel
Forced remote network management.
Please configure as per the network
topology.
Note: The other dip-switch SW2 is a 2-bit switch, which shall be used by manufacturing people.
Users are not advised to change the default status.
3.2.2 Fault-Pass-Through Capability Explanation
When Fault-Pass-Through capability is enabled, there are 3 situations that we call it a link
fault.
1．The equipment will monitor the status of remote Ethernet interface. When it changes to
link down from link up, we take it as a link fault of remote Ethernet. At the same time, the
status of local module will change to link down form link up. It will not be recovered until
the fault disappears at remote site.
2．The equipment will monitor the status of remote E1 interface. When it changes to loss of
signal status from normal, we take is as a link fault of remote E1 link. At the mean time,
the equipment will cut off the transmission of local E1 interface but not send AIS signal.
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The local E1 interface will not recover until the fault disappears at remote site.
3．The equipment will monitor the status of optical link, either transmitting alarm or receiving
alarm will be taken as an optical link fault. At the mean time, the Ethernet interface status
will change to link down and the E1 interface will be cut off. The Ethernet interface and
E1 interface will not recover until the optical interface recovers.
The fault-pass-through capability is designed for users who have particular requirements.
When it is disabled, any fault at remote site and at optical interface has nothing to do with local
interfaces; all the interfaces of local module will be open.
In order to avoid misunderstanding, users are advised to use it cautiously. The factory default
status is disabled.
3.2.3 E1 Remote Loop-back Test
“E1 remote loop-back” setup at local Ethernet Multiplexer
Note: when setup any kinds of loop-back at the local Ethernet Multiplexer, the “remote loop-back”
switch at remote Ethernet Multiplexer must be at default status.
When the module is at E1 remote loop-back status, the Ethernet data communication will not
be interfered.
3.2.4 How to Implement Remote Network Management
When the equipment is connected as the following topology, the remote network management can
be implemented.
A． The host-site module is installed in Raisecom’s dedicated 16-slot 3U-high chassis, which
also has the network management module installed. The remote-site module is installed in
Raisecom’s single slot chassis.
Local site
Interface
Circuit
Interface
Circuit
Multiplex Multiplex
Fiber-optic
Core
Core
BERT
E1 interface
E1 interface
Remote site
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B． The both modules are installed in 16-slot 3U-high chassis, but only the host-site chassis is
equipped with network management module. The remote-site module shall be set to “forced
remote network management mode”. That is to say, the 8th switch shall be turned to ON.
Chapter 4 Installation and Test
4.1 Inspect after Opening
Please first check if the models and part numbers are in consistence, and also check if the
equipments are damaged.
4.2 Preparation before Installation
z Carefully read this manual
z Prepare all kinds of the cable. Ensure that they are not short-circuited. Refer to Appendix A for
cable making.
z Ensure the pressure of power supply is in the tolerance range, the chassis is well connected with
the ground.
z Prepare the BERT and optical power meter for test of line quality.
z Place the equipment at stable and secure environment. Pay attention to the requirements of the
ambience.
4.3 Installation
This module can be installed into Raisecom’s dedicated 16-slot 3U-high chassis, 4-slot
1U-high chassis, and single slot chassis. Slowly insert the module into the slot to the end, and fasten
the fixing screw tightly.
4.3.1 Connecting the Cables
z E1 Signal Interface
120 Ohm balanced signal. Connect with twisted-pair cable, Pin 1, 2 for output and Pin 5, 6 for
input.
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z Ethernet Interface
Connect with Cat. 5 or hyper Cat. 5 twisted-pair cables. Either straight-through or crossover
cable is OK.
z Optical Interface
Plug the tail fiber into the fiber socket to the end.
4.3.2 Function Configuration
After connecting the cables and applying the power supply, there shall not be alarms at the
optical interface.
If users want to configure the dip-switches, first unplug the module from the chassis and then
use a flat screw-driver to set switches.
Chapter 5 Troubleshooting
If there is any problem during installation and operation, please try the following solutions. If
the problem still cannot be solved, please contact distributors for technical support.
The following explanations and solutions to optical and E1 LOS alarms are for the local
module. If the alarms are at the remote site, please solve them at remote site.
z Power (PWR) indicator (Green) is not ON
Answer: Power supply fails. Check whether the power supply is working properly
z LAL indicator (Red) at optical interface is ON
Answer: Loss of signal at the optical interface. Check whether the input of optical fiber is connected
properly. Users can test the optical power using optical power meter. The optical power shall be
larger than the receiving sensitivity.
z E1 sub-channel L/R LOS indicator (Red) is ON
Answer: The local E1 sub-channel receiving signal is lost. If the indicator is flashing, it means the
remote E1 sub-channel receiving signal is lost. Please check if the E1 interface is well
connected.
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Appendix A Cable Making
A.1 E1 Cable Making
Pin Number 1 2 3 4 5 6 7 8
Definition OUT+ OUT-
Not Used Not Used
IN+ IN-
Not Used Not Used
A.2 Ethernet Cable Making
Use Cat.5 twisted-pair cable with RJ45 connector to connect this equipment. Note that the cable
shall not be longer than 100 meters.
Pin 1 Pin 8
The cable can be either straight-through or crossover.
The sequence of the RJ45 connector is as follows.
Pin Number 1 2 3 4 5 6 7 8
MDI Definition TX+ TX- RX+
Not Used Not Used
RX-
Not Used Not Used
MDI-X Definition RX+ RX- TX+
Not Used Not Used
TX-
Not Used Not Used
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