Raisecom RCMS2601-30 User manual

RCMS2601-30
Modular Ethernet Multiplexer
User Manual
(Rev. A)
Raisecom Technology Co., Ltd
(07/2005)

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1. Cautions
Please read the following notices carefully before installing
and using the device, Raisecom does not respond to any loss
that caused by violating safety notice.
RCMS2601-30 is integrated device that has precise elements,
please avoid violent shakes and impacts, and do not
disassemble or maintain the device yourself. If it is required,
please do it under the guide of our technical staff following in
the steps of anti static. Please contact us if there is any need.
There must be grounding protection for the sake of safety; do
not disassemble the device yourself, we regard it as you waiver
your rights of repair guarantee.

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Contents
1. Cautions ...........................................................................................................................................1
2. Overview ..........................................................................................................................................3
2.1. Introduction ..............................................................................................................................3
2.2. Main Features ..........................................................................................................................3
2.3. Part Number Explanation .........................................................................................................4
3. Parameters.......................................................................................................................................5
3.1. E1 Interface Specification ........................................................................................................5
3.2. Fast Ethernet Interface Specification .......................................................................................5
3.3. Optical Interface Specification..................................................................................................5
3.4. Ambience .................................................................................................................................5
4. How to use .......................................................................................................................................6
4.1. Description of the Front Panel..................................................................................................6
4.2. Dip-switch Setup ......................................................................................................................7
4.2.1. SW1 for Working Modes ..................................................................................................7
4.2.2. Fault-Pass-Through Capability Explanation.....................................................................7
4.2.3. E1 Remote Loop-back Test .............................................................................................8
4.2.4. How to Implement Remote Network Management...........................................................8
5. Installation and Test .......................................................................................................................10
5.1. Inspect after Opening.............................................................................................................10
5.2. Preparation before Installation ...............................................................................................10
5.3. Installation..............................................................................................................................10
5.3.1. Connecting the Cables...................................................................................................10
5.3.2. Function Configuration...................................................................................................11
6. Troubleshooting .............................................................................................................................12
7. Appendix A Cable Making ..............................................................................................................13
A.1 E1 Cable Making..........................................................................................................................13
A.2 Ethernet Cable Making ................................................................................................................13

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2. Overview
2.1. Introduction
RCMS2601-30 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. RCMS2601-30 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.
RCMS2601-30 Ethernet Multiplexers include the following models.
Model Description
RCMS2601-30-S
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Host-site/remote-site module, 10/100Mbps auto-sensing (RJ45), 120 Ohm balanced E1 (RJ45), single strand, single
mode(DSC), dual wavelength, 1550nm TX, 1310nm RX, 0-25 km
RCMS2601-30-S
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Host-site/remote-site module, 10/100Mbps auto-sensing (RJ45), 120 Ohm balanced E1 (RJ45), single strand, single
mode(DSC), dual wavelength, 1550nm TX, 1310nm RX, 10-60 km
2.2. Main Features
zLow power consumption due to extra large-scale ASIC chips; high reliability due to
4-layer PCB
zProviding 1 E1 channel interface, transparent transmission mode
zProviding 1 10/100Mbps auto-sensing Ethernet interface
zProviding 1 optical interface, multiplexing E1 and Ethernet data together. 1550nm TX
wavelength
zAlarm indications of local and remote equipment
zSupporting E1 link remote loop-back function, easy fault location
zSupporting speed limit on both transmitting and receiving directions of Ethernet
interface, increment 32kbps
zImplementation of SNMP, capable of local and remote management. It is suggested
that this equipment be deployed at customer premises to work in pairs with
RCMS2401-30 at host site. Both host-site and remote-site network management can
be implemented.

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2.3. Part Number Explanation
Example
RC MS 2 6 01 – 30 – S2
Single mode optical interface, 10-50 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
RCMS2601-30-S1 RCMS2401-30-S1, or
RCMS2301-30-FV35-S1
Single-strand
fiber-optic
equipment RCMS2601-30-S2 RCMS2401-30-S2 or,
RCMS2301-30-FV35-S2

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3. Parameters
3.1. E1 Interface Specification
Bit rate: 2048Kbps±50ppm
Line code: HDB3
Interface impedance: 120Ωbalanced signal
Electrical characteristic: Compliant to ITU-T G.703
Transfer characteristic: Compliant to ITU-T G.823
Jitter Tolerance: ITU-T G.724
3.2. 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
3.3. Optical Interface Specification
Bit rate: 150Mbps
Fiber connector: SC
Transmission distance: Single mode dual-strand S1=0-25 km, S2=10-50 km
3.4. Ambience
Working temperature: 0 ~ 45℃
Relative humidity: ≤90% (25℃)

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4. How to use
4.1. Description of the Front Panel
The sketch of the RCMS2601-30 front panel
Optical Connector:
The optical interface type of RCMS2601-30 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

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1 2 3 4 5 6 7 8
OFF
ON
condition
4.2. Dip-switch Setup
4.2.1. 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.
4.2.2. 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

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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. 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.
4.2.3. 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.
4.2.4. How to Implement Remote Network Management
When the equipment is connected as the following topology, the remote network
management can be implemented.
Local site
Interface
Circuit
Interface
Circuit
Fiber-optic
E1 interface
E1 interface
Multiplex
Core
BERT
Multiplex
Core
Remote site

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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.
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.