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Ethernet to V.35 Interface Converter
User Guide
RC907/908-EV35 User Guide
CONTENTS
CHAPTER 1. INTRODUCTION .................................................................................................... 2
1.1 P
RODUCT INTRODUCTION
......................................................................................................... 2
1.2 P
RODUCT SPECIFICATIONS
........................................................................................................ 2
1.3 E
XPLANATION FOR THE FRONT PANEL AND INDICATORS
........................................................... 4
1.3.1 The Indicators on the Front Panel ....... ........ ......... ...... ......... ......... ........ .......... ......... ..... ... 4
1.3.2 The Definitions of Indicators............................................ ......... ...... ......... ......... ......... ...... 4
CHAPTER 2. CONNECTION CONFIG UR ATION ... ...... ...... ... ...... ..... ....... ... ...... ...... ...... ...... ... ... 6
2.1 I
NTERFACE CONVERTER INTERCONNECTION
............................................................................. 6
2.2 T
YPICAL APPLICATIONS
............................................................................................................ 6
2.3 D
UPLEX MODE CONFIGURATION
.............................................................................................. 7
2.4 C
ONNECTION WITH OTHER NETWORK EQUIPMENT (AT ETHERNET PORT
)................................... 7
CHAPTER 3. INSTALLATION AND PREPARATION ............................................................... 8
CHAPTER 4. DIP-SWITCH SETUP .................................. ... ... .......................................... ..........11
CHAPTER 5. TROUBLESHOOTING......................................................................................... 14
RC907/908-EV35 User Guide
Chapter 1. Introduction
1.1 Product Introduction
RC907/908-EV35 series interface converter, or media converter, is designed to
transmit Ethernet data over V.35 network. Since more and more V.35 network
resources are being deployed, various types of data transmission solutions that
make use of V.35 links will be widely accepted by end-users.
RC907-EV35 series interface converters are standalone interface converters. Every
unit of device has an independence built-in power supply, and can be placed on the
table.
RC908-EV35 series interface converters are slide-in modular interface converters.
They can be installed into RC series 16-slot chassis (19” 3U high chassis),
or 4-slot chassis (19” 1U high chassis), or single slot chassis. When installed
into 16-slot or 4-slot chassis, it can be mixed with other series products (e.g.
copper-to-fiber media converters, single-port optical multiplexers) to enable
uniform network management. RC907-EV35 interface converters can be
deployed at the remote site to work in pairs with RC908-EV35.
RC907/908-EV35 (Rev. B) has interoperability with the previous version (Rev. A).
The differences between the two versions are only at Ethernet interfaces. So it is
not necessary to consider other properties when they interconnect with each other.
The bandwidth setup and clock phase configuration of Rev. B are the same as those
of Rev. A. Please consult our technical support if encountering any problem.
1.2 Product Specifications
m
V.35 interface:
Physical characteristics: Compliant with V.35 interface standard
Connector type: HDB26 female connector (26 pin female port)
Working mode: DTE
Bit rate: Dependent on DCE equipment, the maximum bit rate up
to 8Mbps
m
Ethernet interface
Connector type: RJ-45 interface, CAT.5/enhanced CAT.5 wires, and the
maximum transmission distance up to 100m
Bit rate: 10Mbps
Duplex mode: Full/half duplex auto-negotiation
Compliance: IEEE 802.3
Other capabilities:
1. The function of reporting V.35 signal loss alarm to Switches
2. Supports IEEE 802.1d Spanning Tree and IEEE 802.1q VLAN protocols
3. Supports over-sized Ethernet data frame up to 1595 bytes.
4. Supports IEEE 802.3x flow control in full duplex mode
5. Supports back pressure flow control in half duplex mode
6. Built-in 1k MAC address table with address filtering capability to improve the
efficiency of the V.35 link
7. Built-in SDRAM 64M memory to alleviate data congestion
m
Network management capabilities for RC908-EV35 (NM software is optional)
The network management capabilities include:
1. Set up the phase relationship between transmit/receive data and
transmit/receive clock at V.35 interface;
2. Set up of the buffer capacity;
3. Report operating status of Ethernet port to SNMP server;
4. Set up full/half duplex mode at Ethernet interface;
5. Set up fault-pass-through function;
6. Close the Ethernet interface and disable the modular through NMS
software;
7. Keep history record of all events.
RC907/908-EV35 User Guide
1.3 Explanation for the Front Panel and Indicators
1.3.1 The Indicators on the Front Panel
Ethernet Link ETH Data TX/RX Action
RC907-EV35
LNK
ACT
DTE
PWR
UTP
FDX
1 2 3 4 5 6 7 8
SW
Power Supply
Full Duplex
Figure 1. The front panel of RC907-EV35
Ethernet Link ETH Data TX/RX Action
LNK
ACT
DTE
PWR
UTP
FDX
Power Supply Full Duplex
Figure 2. The front panel of RC908-EV35
1.3.2 The Definitions of Indicators
Ethernet Link (LNK): On: Ethernet link is properly connected
Off: Ethernet link is disconnected
Ethernet data TX/RX Action (ACT): Flashing: Transmitting or receiving data
Full Duplex Mode (FDX): On: Full duplex mode
Off: Half duplex mode
Power supply (PWR): On: The power supply is in good condition
Off: The power supply is disconnected.
RC907/908-EV35 User Guide
The connector types of the interface are as the following.
V.35 interface:
The DTE connector: HDB26 female connector. Please refer to Chapter 3 for details
of the interface definition and cable connection.
Ethernet interface:
The UTP connector: Unshielded twisted pair connector for Ethernet. Please refer to
Chapter 3 for details of the interface definition and cable connection.
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RC907/908-EV35 User Guide
Chapter 2. Connection Configuration
2.1 Interface Converter Interconnection
When connecting interface converters, it is required to comply with the specific
connection article numbers according to the following table. Otherwise, the link
will not be established, or abnormal data transmission will occur.
The Host Site The Remote Site
RC908-EV35 RC908-EV35
RC908-EV35 RC907-EV35
2.2 Typical Applications
Interface
Converter
10Base-T
V.35
DDN
V.35
ase-T
Ethernet
switch
m
DDN leased line is utilized to extend the data transmission distance of Ethernet
m
IEEE802.1q protocol is supported to ensure the key features of most
mainstream products, such as between-switch VLAN and TRUNK functions.
m
RC907/908-EV35 series interface converters can be used to provide
private DDN network solutions for organizations and departments such as
finance, government and education etc.
RC907/908-EV35 User Guide
2.3 Duplex Mode Configuration
RC907/908-EV35 series Ethernet to V.35 interface converters are devices used to
conduct media conversions and extend transmission distances. When connecting
RC907/908-EV35 interface converters with other network equipment, they need to
cooperate with each other to work properly. Different duplex mode configurations
on network equipment interfaces will affect the transmission efficiency of the
network. The recommended configurations are listed in the following table when
interconnecting different network equipment.
The working mode of other network
equipment
RC907/908-EV35 working mode
10Mbps full duplex
The interface converter shall be
configured to full duplex mode when
auto-negotiation fails.
10Mbps half duplex
The interface converter shall be
configured to half duplex mode when
auto-negotiation fails. (Factory default)
Auto-negotiation
No need for configuration. (Factory
default)
100Mbps full duplex
The interface converter cannot connect
with 100Mbps interfaces of other
equipment.
100Mbps half duplex
The interface converter cannot connect
with 100Mbps interfaces of other
equipment.
2.4 Connection with other network equipment (at
Ethernet port)
RC907/908-EV35 series interface converter supports MDI/MDIX auto-sensing.
RC907/908-EV35 User Guide
Chapter 3. Installation and Preparation
1. First, please choose the appropriate configuration structure to be applied,
referring to the sketch map of recommended basic connection structure.
2. Make sure that the V.35 cable matches the connected equipment. If
RC907/908-EV35 interface converter is used to connect DCE, please use DTE
cable.
3. Use CAT.5 UTP to connect the Ethernet port of RC907/908-EV35 interface
converter, and make sure that the length of the UTP cable does not exceed
100m.
NO.1 pin NO.8 pin
The pin definitions of the RJ45 interface on RC907/908-EV35 interface converter
are as follows.
Pin number 1 2 3 4 5 6 7 8
Definition TX+ TX-
RX+
Not
Used
Not
Used
RX-
Not
Used
Not
Used
Details Output+ Output- Input+ Hang Hang Input- Hang Hang
The following diagram indicates the correct line sequence of straight-through UTP
cable.
RC907/908-EV35 UTP-RJ45 Ethernet device RJ45
Pin 1
Pin 1
Pin 2 Pin 2
Pin 3 Pin 3
Pin 6 Pin 6
RC907/908-EV35 User Guide
The following diagram indicates the correct line sequence of crossover UTP cable.
RC907/908-EV35 UTP-RJ45 Host network card RJ45
Pin 1 Pin 1
Pin 2 Pin 2
Pin 3 Pin 3
Pin 6 Pin 6
In these two connection types, Pin 1 and Pin 2 are in a twisted pair, and so are Pin 3
and Pin 6. Since RC907/908-EV35 interface converters support MDI/MDIX
auto-sensing function, users can adopt either kind of the above cables.
4. The V.35 interface adopts HDB26 female connector，the definitions are as
follows:
Pin Name Input/Output Pin Number
Chassis Ground — CGND - 1
Signal Ground — GND - 7
Receive Data (A) — RD(A) I 3
Receive Data (B) — RD(B) I 21
Receive Timing (A) — RCK(A) I 17
Receive Timing (B) — RCK(B) I 25
Send Data (A) — TD(A) O 2
Send Data (B) — TD(B) O 11
Send Timing (A) — TCK(A) I 15
Send Timing (B) — TCK(B) I 23
Terminal Timing (A) — SCTE(A) O 24
Terminal Timing (B) — SCTE(B) O 16
Request to Send — RTS O 4
Clear to Send — CTS I 5
Data Set Ready — DSR I 6
Data Carrier Detect — DCD I 8
Data Terminal Ready — DTR O 20
I—input; O—output
Note: It is strictly forbidden to hot-swap the V.35 interface with power supply
applied!
RC907/908-EV35 User Guide
5. RC907/908-EV35 interface converter must work in pairs point to point. There
shall be DCE equipment between two converters. It cannot connect with the
third party’s branded interface converter.
6. Ambience:
Working temperature: 0-45
Humidity: 5%~90% non-condensing
7. Power supply: AC/DC optional
AC: 220V/50Hz (input ranges form 165 to 265V)
DC: －48V (input ranges from –36 to -72V)
Power consumption: ≤ 5W
8. Dimensions (for RC907-EV35 standalone interface converter)
Dimension: 120 (width) x 32 (height) x 157 (depth) mm
9. We recommend that users install and configure the interface converter after
reading the next chapter and finishing the relevant preparations.
RC907/908-EV35 User Guide
Chapter 4. Dip-switch Setup
The configuration dip-switch is on the front panel of RC907-EV35. (It is on the
back panel of RC908-EV35.) The definitions of the dip-switch are as follows.
m
The 1st bit: Duplex mode setup
This bit is used to configure the duplex mode when the auto-negotiation at Ethernet
interface fails.
ON: Full duplex mode when auto-negotiation fails
OFF: Half duplex mode when auto-negotiation fails (default)
According to the port of user devices, this bit should be configured as follows.
Port of User Devices The 1st Bit Setup Actual Working Mode
10/100Mbps auto-negotiation Any 10Mbps full duplex mode
Forced 10Mbps half duplex OFF 10Mbps half duplex mode
Forced 10Mbps full duplex ON 10Mbps full duplex mode
10Mbps full/half duplex
auto-negotiation
Any 10Mbps full duplex mode
Since the Ethernet interface of RC907/908-EV35 works at 10Mbps full/half duplex
mode auto-negotiation, it cannot be connected with the forced 100Mbps interface
of other equipment.
m
The 2nd bit: Fault-Pass-Through function setup
On: Fault-Pass-Through function enabled. In this case, the DSR alarm of V.35
interface can lead to complete failure of the Ethernet port, and the link fault will be
reported to the Switch. When the DSR alarm of V.35 interface disappears, the
Ethernet port will automatically recover.
Off: Fault-Pass-Through function disabled (factory default). In this case, the
DSR alarm will not have effect on the Ethernet port.
m
The 3rd ~5th bit: Buffer size setup
Since the bit rate of V.35 interface is dependent on the rate of connected DCE
equipment, it varies in large range. It is necessary to adjust the size of buffer. It can
RC907/908-EV35 User Guide
not only prevent long time delay, but also avoid packet loss caused by sudden data
flooding. It is suggested that the buffer size be configured as the following table.
DIP-switch
WAN Interface Rate (bit/s)
3rd Bit 4th Bit 5th Bit
≥2M OFF OFF OFF
> 1M OFF ON ON
> 512K ON OFF ON
> 256K ON ON OFF
> 64K ON ON ON
≤64K ON ON ON
m
The 6th bit: TX CLK phase selection switch.
It provides various options for different phase relationships of transmitting data and
TX clocking at V.35 interface between different brands DCE equipment.
OFF: positive phase (default).
ON: negative phase.
m
The 7th bit: RX CLK phase selection switch.
It provides various options for different phase relationships of receiving data and
RX clocking at V.35 interface between different brands DCE equipment.
OFF: positive phase (default).
ON: negative phase.
m
The 8th bit: Reserved bit.
The factory default setup of the dip-switch:
DIP-switch 1
2
3
4
5
6
7
8
ON
OFF
■
■
■
■
■
■
■
■
Details
Half
duplex
Fault
Pass
Through
disabled
Maximum buffer size
Positive
phase
Positive
phase
No
Meaning
Note:
1. Please use the 1st bit to configure the half/full duplex mode of converters
following the instructions in 2.3 Full Duplex Mode Configuration, Chapter 2.
RC907/908-EV35 User Guide
2. The 3rd ~ 5th bits of the dip-switch can be configured according to the above
table to achieve the best transmission performance.
3. Only if all bits of the dip-switch are set to the factory default status, network
management software can command, configure and inquire the status of the
interface converter; Otherwise, the software has the inquiry function only.
After finishing the above steps, the power supply of the device can be switched on.
If there is any problem, please refer to the last chapter – “Troubleshooting” for
operation and maintenance.
RC907/908-EV35 User Guide
Chapter 5. Troubleshooting
If there is any problem during the installation and operation, please try the
following solutions. If the problem cannot be solved yet, please contact distributors
for technical support.
m
PWR indicator is not on
Answer: Power supply fails. Check whether the power supply is working properly,
and make sure the power cable for –48V DC is not reversely connected.
m
Link indicator (LNK) is off
Answer: Please check if the link is disconnected.
Please check whether the bit rate matches. The bit rate of the Ethernet equipment
interface connected with the interface converter should be auto-negotiation or fixed
10Mbps.
m
LNK is on and ACT is flashing rapidly and continuously, but the
equipment cannot be pinged through.
Answer: In most cases, the reason is that the interface converter is connected with
100Mbps network equipment. RC907/908-EV35 can only connect with 10Mbps or
auto-negotiation interfaces. Please verify the bit rate of the connected network
equipment.
m
LNK is on and ACT is flashing intermittently at normal status, but the
equipment cannot be pinged through.
Answer: The reason may be that the phase relationship between the data and the
clock of DCE V.35 interface is not the same as the configuration of the interface
converter. Please reconfigure the 6th and 7th bits of the dip-switch.
m
Severe packet loss
Answer: The possible reasons for severe packet loss are as follows:
1. The duplex mode of the Ethernet interface of the interface converter is not
matching with that of the Ethernet equipment. Please refer to 2.3 Full
Duplex Mode Configuration, Chapter 2.
RC907/908-EV35 User Guide
2. There is some problem with connection between twisted pair and RJ-45
connector.
3. If there are bit errors in V.35 link, please check equipment alarm function,
or test bit error rate of V.35 link by bit error tester.
4. If the traffic through converter increases suddenly, it may cause congestion
within a short time, and result in disconnection of the network. In this case,
the network service with huge amount of traffic should be paused and
restarted after 10 seconds, and the network will be back to normal
condition. However, if a long time disconnection occurs, it is abnormal.
Please check the operation condition of equipments.
To improve the network efficiency, both the Ethernet equipment and the interface
converter shall be set in full duplex mode, with great attention to the matching of
working modes. RC907/908-EV35 may not be suitable for some IP-based image
transmission equipments.
Since the bit rate of pinging large-size packets may exceed transmission capability
of V.35 link, many packet losses may occur. To solve this problem, please try to
increase the timeout parameter of the ‘Ping’ command.
m
Network management software can only review, but not conduct
configuration
Answer: The possible reason is that some bits of the dip-switch are not set on the
default status. Please refer to Chapter 4 for details.
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