Procentec ProfiHub B2FOR+ User manual

ProfiHub B2FOR+ / B4FOR+
User manual

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 2/60
Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning sign
and are marked as follows according to the level of danger:
Draws your attention to important information on handling the product, a particular part of the
documentation or the correct functioning of the product.
Warning
This device and its components may only be used for the applications described in this manual and only in
connection with devices or components that comply with PROFIBUS and an RS 485 interface.
This product can only function correctly and safely if it is transported, stored, set up, installed, operated and
maintained as recommended.
Qualified Technicians
Only qualified technicians should be allowed to install and work with this equipment. Qualified technicians are
defined as persons who are authorized to commission, to ground, to tag circuits and systems in accordance
with established safety practices and standards. It is recommended that the technicians carry a Certified
PROFIBUS Installer or Certified PROFIBUS Engineer certificate.
Disclaimer of Liability
We have checked the contents of this manual as much as possible. Since deviations cannot be precluded
entirely, we cannot guarantee full agreement. However, the content in this manual is reviewed regularly and
any necessary corrections included in subsequent editions. Suggestions for improvement are welcomed.
Copyright © 2019 PROCENTEC
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted,
in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior
written permission of the publisher.


ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 3/60
Important information
Purpose of the Manual
This manual explains how to put the ProfiHub B2FOR+ / B4FOR+ into operation.
Recycling and Disposal
The parts of the ProfiHub can be recycled. For further information about environment-friendly recycling and
the procedure for disposing your old equipment, please contact:
Document Updates
You can obtain constantly updated information on PROCENTEC products on the Internet at
www.procentec.com
You can also contact PROCENTEC Customer Support:
•by phone at [phone]
•by fax at [phone]
•by email at [e-mail]
PROCENTEC
Klopperman 16
2292 JD WATERINGEN
The Netherlands
Tel.: [phone]
Fax: [phone]
Email: [e-mail]

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 4/60
Important notices
WARNING
When the product is in use at an ambient temperature of 63 degrees Celsius or 145 degrees Fahrenheit, the
housing of the ProfiHub B2FOR+ / B4FOR+ will be hot. Do not touch the housing!
At normal operating temperatures of 25 degrees Celsius, the temperature of the housing will not exceed 35
degrees Celsius.
WARNING
When the product is in use at an ambient temperature of 63 degrees Celsius or 145 degrees Fahrenheit, the
housing of the ProfiHub B2FOR+ / B4FOR+ will be hot. Do not touch wires which are in contact with the
housing!
WARNING
When the product is in use at an ambient temperature of 63 degrees Celsius or 145 degrees Fahrenheit, the
housing of the ProfiHub B2FOR+ / B4FOR+ will be hot. Use wires suitable for these temperatures!
HOT HOUSING warning located on the side of the housing. Make sure this warning is visible after wall
installation. UL certification demands the warning to be visible during operation.

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 5/60
To comply with UL certification regulations (UL60950-1) the power supply must be a Limited Power Source
(LPS) or NEC Class 2 or CEC Class 2 that cannot exceed 100VA.
According to UL60950-1, if a copper PROFIBUS cable is used outside, it is required to install surge protection
that is suitable for PROFIBUS.
To comply with UL certification regulations the ProfiHub B2FOR+ / B4FOR+ is to be used on altitudes under
2000 m.

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 6/60
Contents
Important information............................................................................................................................................ 3
Important notices ................................................................................................................................................... 4
Contents.................................................................................................................................................................. 6
1. Product Description ............................................................................................................................................ 8
1.1 Product Features.......................................................................................................................................... 9
1.2 Application areas ....................................................................................................................................... 10
1.3 Additional Benefits .................................................................................................................................... 10
1.4 Channel Structure ...................................................................................................................................... 12
1.5 Grounding System...................................................................................................................................... 12
1.6 Cable lengths for PROFIBUS DP ................................................................................................................. 12
1.7 Cable types for PROFIBUS DP .................................................................................................................... 13
1.8 Cable lengths for fiber optic ...................................................................................................................... 14
1.9 Cable types for fiber optic ......................................................................................................................... 14
1.10Status LEDs................................................................................................................................................. 15
1.11The red error LED....................................................................................................................................... 15
2Installation Instructions ProfiHub B2FOR+ / B4FOR+................................................................................... 16
2.1 Location ..................................................................................................................................................... 16
2.2 Position ...................................................................................................................................................... 16
2.3 Mounting ................................................................................................................................................... 16
2.4 Power Supply ............................................................................................................................................. 17
2.5 Grounding of the power ............................................................................................................................ 18
2.6 Relay contact ............................................................................................................................................. 19
2.7 Backbone ................................................................................................................................................... 19
2.8 Calculating the delay time ........................................................................................................................ 20
2.9 Spur Segments ........................................................................................................................................... 21
2.10Termination ............................................................................................................................................... 22
2.11Baudrate switch ......................................................................................................................................... 22
2.12Robust Repeating Mode ............................................................................................................................ 23
2.13Channel Redundancy ................................................................................................................................. 24
3Diagnostics Device........................................................................................................................................ 25
3.1 Setting up the Diagnostics Device.............................................................................................................. 27
3.1.1 Enabling the Diagnostics Device .......................................................................................................... 27
3.1.2 Changing the default PROFIBUS address............................................................................................. 27
3.1.3 GSD file ................................................................................................................................................ 28
3.2 Configuring the Diagnostic Device............................................................................................................. 28
3.2.1 Info data (mandatory module) ............................................................................................................ 28
3.2.2 Alarm Confirmation ............................................................................................................................. 28
3.2.3 Redundant Status ................................................................................................................................ 28
3.2.4 Baudrate Status ................................................................................................................................... 29

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 7/60
3.2.5 Relay Status ......................................................................................................................................... 29
3.2.6 Power Status........................................................................................................................................ 29
3.2.7 Termination Status .............................................................................................................................. 30
3.2.8 Channel Status..................................................................................................................................... 30
3.2.9 Fiber Optic Status ................................................................................................................................ 30
3.2.10 Livelist Status.................................................................................................................................. 31
3.2.11 Statistics (Short Format, Long Format ).......................................................................................... 32
3.3 Parameterizing the Diagnostic Device ....................................................................................................... 34
3.3.1 Diagnostics........................................................................................................................................... 34
3.3.2 Statistics............................................................................................................................................... 35
3.3.3 Extended Diagnostics on Events change ............................................................................................. 35
3.3.4 Extended Diagnostics on Statistics change.......................................................................................... 36
3.3.5 Alarm Relay on Events change ............................................................................................................ 37
3.3.6 Alarm relay on Statistics change.......................................................................................................... 37
3.3.7 Changing the Diagnostics duration/timeout ....................................................................................... 38
3.3.8 Changing the Device Lost timeout....................................................................................................... 39
3.3.9 Changing the data format.................................................................................................................... 39
4Technical Data ProfiHub B2FOR+ / B4FOR+ ................................................................................................. 40
5Order codes.................................................................................................................................................. 44
6Glossary........................................................................................................................................................ 45
8Revision History............................................................................................................................................ 48
9Sales offices and Distributors....................................................................................................................... 49
10 Certificates .............................................................................................................................................. 54
11 Notes ....................................................................................................................................................... 57
About PROCENTEC ................................................................................................................................................ 59

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 8/60
1. Product Description
This innovative network component is an essential element when it comes down to maintaining PROFIBUS DP
systems when a host system must be involved. In the past, the application software was not able to identify
bus diagnostic information and act accordingly. With the ProfiHub B2FOR+ MM/SM and B4FOR+ MM/SM this
information is fully available in a PLC/DCS system with the DP-V0 protocol or in a ComBricks system. The
information can be visualized with a SCADA/WINCC system or with the WEB-based interface of the ComBricks
system. Even the location of certain devices behind the channels of the ProfiHub can easily be verified, and it is
very useful to identify the topology from a host system point of view.
The ProfiHub B2FOR+ MM/SM and B4FOR+ MM/SM are robust network components providing reliable
solutions for fiber rings, spur lines and star-shaped structures in PROFIBUS DP networks.
The user provides the ProfiHub with a bus address (software set slave address function). By means of the GSD
file the user can configure the data that is required from the ProfiHub. The cyclical data can contain simple
statistics up to complex structures identifying channel problems.
The ProfiHub B2FOR+ MM/SM and B4FOR+ MM/SM have one fiber optic channel with two ports and two or
four galvanic isolated RS485 channels. With the two fiber optic ports, a ring or line/bus structure can be
realized whereby each HUB has two or four RS485 channels on which 31 devices or other HUBs can be
connected. The plug-able screw terminals with integrated termination of the RS485 channels can be used with
an end point of a segment. Also, the DB9 connectors could be used with a segment end point or for monitoring
purposes. Another application of the DB9 connector is, to connect the HUB to any place in a segment.
If bus redundancy is enabled, the two rightmost RS485 channels will form a redundant pair. In combination
with another ProfiHubHUB, cable redundancy can be realized.
Fig. 1 - ProfiHub B4FOR+

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 9/60
1.1 Product Features
•PROFIBUS DP Slave for network diagnostics and statistics (DP-V0, configurable with modules)
•Diagnostic information and statistics available in ComBricks system with WEB-based interface
•One Fiber Optic channel, split into two ports
•2 or 4 galvanic isolated RS485 channels
•Fiber Optic redundancy with signal strength and ring status (LEDs, DP-V0 and WEB-based on
ComBricks system)
•RS485 Cable redundancy
•Redundant power supply
•Robust repeating mode
•Supporting line/bus, ring, star and tree topology
•Alarm contact
•Monitoring port on all RS 485 channels
•Short circuit protection on all RS 485 segments
•Configurable grounding system
•Glitch recovery
•Low power consumption
•No limit in cascading RS485 channels (only limited by busparameters of the master)
•Integrated Termination per channel
Fig. 2 - ProfiHub connections
Intelligent Internal Backbone
C1 C2 C3 C4
Channel 1 to 4
Power supply 2
Power supply 1
Alarm contact
FO1
Port 1 and 2
FO Channel 1

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 10/60
Fig. 3 - Long spur lines to instruments and the possibility to remove/insert them during operation. Short circuit protection on each spur
line is automatically provided.
1.2 Application areas
• Create Fiber Optic backbones and rings
•Dynamic spur lines to actuators, flow meters and pH analyzers
•Removable drives and motors
•Pull/Plug motor control centers (drawers)
•Roof mounted devices in tank farms
•Barrier for non-galvanic isolated equipment
•Networks with requirement for High Availability/uptime
•Large star/tree structured networks
1.3 Additional Benefits
•Hot slave insertion and removal during operation
•Short circuit protection on each Channel
•Option to create a redundant path to other Hubs or ComBricks
•Compact and robust construction
•Status and error LEDs (per Channel)
•Suitable for all DP cables
•Conveniently arranged networks
•Easy extendable installations
•On-board DB9 female connector on each channel for maintenance activities
•Cost Savings
DP Fiber Optic Backbone
Wiring problems
do not spread to
the other spur lines
Each spur line
can be 200m
at 1,5 Mbps

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 11/60
Fig. 4 - Because of the isolation and intelligence the ProfiHub provides, it can be used as a barrier for electrically sensitive
segments. This keeps the backbone and other Channels clean.

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 12/60
1.4 Channel Structure
Each Channel is electrically isolated and internally connected to the transparent intelligent backbone. The
termination is switchable and powered by the ProfiHub. The shielding of the PROFIBUS cable can be directly
grounded or indirectly grounded (see the next paragraph).
1.5 Grounding System
The ProfiHub B2FOR+ / B4FOR+ can be grounded by 3 methods:
1. Direct grounding on the Ground Rail
2. Indirect grounding (through a capacitor)
3. Combination of direct and indirect.
The power supply must be grounded directly on the Ground Rail. The shielding of the PROFIBUS cables can be
directly or indirectly grounded. If you do not want to ground all or some cables to the common ground, i.e.
compensating current, the cable shielding must be connected to pin ‘I’ which stands for Indirect grounding. A
capacitor with a parallel high value resistor will separate the 2 potentials (Fig. 5), ensuring protection of the
signal against non-DC disturbances.
If the ground is accidentally connected to the indirect ground on a channel, the connection to the Direct
Grounding bypasses the capacitor of the Indirect Ground connection. The current on the shield will flow to
Direct Ground.
1.6 Cable lengths for PROFIBUS DP
The cables on the Channels and the Main-Channel must comply with the PROFIBUS DP cable specifications for
RS 485 (Fig. 6).
RS 485
Circuit
A
B
Isolation
Circuit
Powered
Termination
Isolated Area
CC
DGND Indirect grounding
Term.
Switch
RX-OK
ERROR
Intelligent
Backbone
I
To direct grounding of
other Channels
Fig. 5 - Channel structure

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 13/60
1.7 Cable types for PROFIBUS DP
The cable type must comply with the PROFIBUS DP cable specifications for RS 485 (Fig. 7).
Fig. 7 - PROFIBUS DP cable specifications
The ProfiHub B2FOR+ / B4FOR+ can handle cables based on multiple protection sheaths with an overall cable
diameter between 6 to 12 mm (Fig. 8).
Fig. 6 - Cable lengths for PROFIBUS DP

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 14/60
Fig. 8 - Cables with different protection sheaths.
1.8 Cable lengths for fiber optic
The maximum cable length for fiber optic cables is 5 kilometers with the multimode transceivers (B2FOR+MM
and B4FOR+MM) and 30 kilometers with single mode transceivers (B2FOR+SM and B4FOR+SM).
1.9 Cable types for fiber optic
The following cable types can be used with the ProfiHub B2FOR+ and B4FOR+:
ProfiHub type: B2FOR+MM B2FOR+SM B4FOR+MM B4FOR+SM
Fiber Optic wavelength
Cable type
Cable length
Optical budget
Connectors
Topologies
Cascading depth
Multimode 1310 nm
Fiber 50 / 125 µm
(OM2 or better)
Fiber 62.5 / 125 µm
(OM1)
Max. 5 km (1dB / km)
13 dB
Single mode 1310 nm
Fiber 9 / 125 µm (OS1 or
OS2)
Max. 30 km (0.4dB / km)
17 dB
Multimode 1310 nm
Fiber 50 / 125 µm
(OM2 or better)
Fiber 62.5 / 125 µm
(OM1)
Max. 5 km (1dB / km)
13 dB
Single mode 1310 nm
Fiber 9 / 125 µm (OS1 or
OS2)
Max. 30 km (0.4dB / km)
17 dB
4 x ST/BFOC (one channel, two ports)
Ring, point-to-point (direct, hub, split, star)
No limit, only busparameter limitation of the master

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 15/60
1.10 Status LEDs
The Status LEDs on the ProfiHub are very useful for diagnostics.
LED
OFF
Blinking
ON
POWER 1 / 2

Power is not
switched on or an
internal failure

Power was bad, now
OK (alarm pending).

Power supply OK.
READY

Power is not
switched on or an
internal failure

Trying to detect the
transmission speed, but
has not locked it yet

The transmission
speed has been detected.
Fiber Link RX-OK

No communication
detected

Receiving valid
PROFIBUS messages

Fiber connection to
next link established
Fiber Port ERROR

No problem has been
detected

Signal was too low,
now fixed (alarm pending)

Signal too low, no
connection to next link
Fiber Level

No problem has been
detected

Signal was critical,
now fixed (alarm pending)

critical signal, but
messages could still be
received
Fiber Ring Fail

No problem has been
detected

Ring was broken, now
fixed (alarm pending)

Ring is broken
RS 485 RX-OK

There is no
communication detected
(on this Channel)

one or more devices
communicating (on this
Channel)

one or more devices
communicating (on this
Channel)
RS485 ERROR

No problem has been
detected

Problem in the cabling
has been detected on this
Channel, see 1.11

Problem in the cabling
has been detected on this
Channel, see 1.11
RS 485 INT. TERM
Termination for this
channel is OFF
Internal failure
Termination for this
channel is ON
1.11 The red error LED
The red error LEDs on a channel will blink shortly if a corrupt message enters the ProfiHub. More specifically,
this can be a Parity error (the parity checksum of the byte is incorrect) or a Framing error (the FCS byte is
different than the real message). It is necessary to investigate further with an oscilloscope to find out what the
problem is. This can easily be done with ProfiTrace.
Another reason for the red error LED for channel 1 or 2 of the B2FOR+ MM/SM or channel 4 and 5 of the
B4FOR+ MM/SM is a problem in the redundant cabling (if the ProfiHub is set to redundant; rotary switch
position 2 and 5). The red error LED is ON with a problem in one or both cables and blinking If there was a
problem but now fixed. A cable redundancy alarm is pending. Press the ‘Alarm Reset’ button to reset the
pending Alarm. This can also be done remotely with the conformation module of the diagnostic slave (DP-V0)
or in the Diagnostic slave info WEB-page of the ComBricks Head station.
It can also be that the baudrate is not locked (no PROFIBUS master on the bus). If a baudrate has been locked
and the master disappears from the bus, the current baud rate will be unlocked after 50 seconds.

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 16/60
2 Installation Instructions ProfiHub B2FOR+ / B4FOR+
2.1 Location
The ProfiHub can be installed everywhere in a non-hazardous area that complies with IP 20 (DIN 40 050) and
the specified temperature range of -25 to +70o Celsius.
2.2 Position
The ProfiHub can be installed in every position, but it is recommended to install it with the cables pointing
down. In this position it is also easier to read the status LEDs.
2.3 Mounting
The ProfiHub can be mounted on 35 mm DIN-rail with a minimum width of 167 mm. The ProfiHub B2FOR+ /
B4FOR+ has only been UL approved with 35 mm DIN-rail mounting!
The supplied rubber studs need to be placed on the back of the housing of the ProfiHub B2FOR+ / B4FOR+ for
extra fixation. This is to prevent the product to potentially slide off the DIN-rail. See Fig. 9 for an example.
Fig. 9 – Rubber studs on backside of housing

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 17/60
2.4 Power Supply
To comply with UL certification regulations the power supply must be a Limited Power Source (LPS) or NEC
Class 2 or CEC Class 2 that cannot exceed 100VA.
The two 2-pin screw type power connectors are located on the left of the ProfiHub B2FOR+ / B4FOR+ (Fig. 10).
1 = + (left)
2 = -(right)
Both power connectors are linked 1-on-1 to the internal power supply of the B2FOR+ / B4FOR+. If one power
supply fails, the other power connection takes over, maintaining the supply voltage. When redundancy is not
required, it is sufficient to use one power connector. Please note that when using only one power supply, a
voltage of max. 0.25 V will exist on the other unconnected power connector, as shown in Fig. 11.
If only one power supply is used, the alarm contact is closed and an alarm is triggered (pending alarm). If two
power sources are connected after a pending alarm, the contact can be opened by resetting the alarm (see
paragraph ‘2.6 Relay contact’). As soon as one of the power supplies fails, the contact will close again with
pending alarm and the Power Indicator LED will blink.
For UL certified installations the power supply must comply with the following specifications:
•Limited Power Source (LPS) or NEC Class 2 or CEC Class 2
•Voltage: 12 - 24 VDC
•Current: min 130 mA
•Wire diameter: < 2.5 mm2
Power
Connectors
Power LEDs
Grounding points
Power
Connectors
Power LEDs
Alarm contact
Grounding points
Fig. 10 - Power connectors and LEDs
Fig. 11 – Maximum voltage on unconnected Power Connector

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Procedure
To connect the 24V supply to the 2-pin screw-type terminal, proceed as follows:
•Strip the insulation from the cable or the conductors for the 24V power supply.
•Add cable crimp terminals/wire ferrules to the conductors.
•Secure the crimp terminals in the screw-type terminal.
To connect the power supply, you need a 3 mm screwdriver.
Testing
If the power is switched on it can be diagnosed by the following indicators:
•LEDs should be blinking in a circular animation for a short time.
•The POWER LED of the respective power connector (1, 2 or both) is ON.
•The READY LED is ON or Blinking, depending on baud rate lock.
2.5 Grounding of the power
It is recommended to use a power supply with a ground lead (3-wire). Connect the ground lead of the
power lead to the Ground Rail of the ProfiHub. Connect the Ground Rail to the common ground with
a separate ground lead. See Fig. 12 for an example.
Fig. 12 - Connection to Ground Rail


ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 19/60
2.6 Relay contact
The ProfiHub features a potential-free relay contact. This alarm contact can be used to monitor the power
supplies. Example applications are: Connect a LED tower, alarm buzzer, SMS server or use it as a digital signal
for the PLC. The relay can also be used for alarming in case of retries, illegals, or other events. For more
information refer to Chapter 3.
If only one power supply is used, the alarm contact is closed after 60 seconds after start-up. If two power
sources are connected, the contact is open. When one of the power supplies fails for 3 seconds or more, the
contact will close and the Power Indicator LED will blink. If you are using only one power source and wish to
use the Relay contact, simply connect Power 1 to Power 2.
In the case of an interrupted power supply you can reset the contact by pressing the ‘Reset’ button. The
contact will open and the LEDs will stop blinking.
The Alarm contact is also switched when the ProfiHub is in Redundant mode and one of the redundant paths
fails, or when the fiber ring fails or one of the fiber signals is low or off.
The maximum power to be connected to the alarm contact is 24 VDC. The maximum current consumption is
500 mA.
It is advised to use a Limited Power Source (LPS) of NEC Class 2 or CEC Class 2 for powering the alarm contact.
2.7 Backbone
The fiber channel can be used to create a backbone together with a ComBricks set. The ComBricks can retrieve
all the diagnostic information (a ComBricks FOR-MM1 or FOR-SM1 is required). It is also possible to connect the
ComBricks via copper to one of the copper channels of the ProfiHub B2FOR+ or B4FOR+.
Fig. 13 - Example topology for a fiber backbone with ProfiHubs
ProfiHub B4FOR+

ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 20/60
2.8 Calculating the delay time
Fiber optic applications require a delay time calculation to adjust the MinTSDR and Slottime (Tslot)
busparameters in the configuration of the master(s). The B2FOR+ / B4FOR+ complies with the following
formulas:
TSLOT ≥MaxTSDR + ((FOlength x FOdelay) + (NFO-modules x Ndelay)) x 2
•FOlength = Total length of fiber optic cable in km
•FOdelay = Delay of fiber optic cable per km in bit times (see table)
•NFO-modules = Number of fiber optic modules in cascade
•Ndelay = Delay of one fiber optic module (see table)
The delay time is multiplied by 2 for a request and response message.
Baudrate
Max
TSDR
[Tbit]
FO
delay
[Tbit/km]
N
delay
Normal
mode [Tbit]
N
delay
Robust and
Red. Mode [Tbit]
12 Mbps
800
60
47
59
6 Mbps
450
30
25
36
3 Mbps
250
15
14.5
25
1.5 Mbps
150
7.5
9
20
500 kbps
100
2.5
5
16
187.5 kbps
60
0.94
4.5
15.5
93.75 kbps
60
0.47
4.5
15.5
45.45 kbps
400
0.23
4.5
15.5
19.2 kbps
60
0.1
4
15
9.6 kbps
60
0.05
4
15
Note: FOdelay= (FOcable_length / FOcablelatency )/ Bittime
Example FOdelay, 1km, 1.5Mbps: (1000 m / 200 µsec/m ) / 0.666 µsec = 7.5 Tbit/km
Example 1: 1.5 Mbps, 5 km FO cable (total ring or line length), 6 units Normal mode
TSLOT ≥MaxTSDR + ((FOlength x FOdelay) + (NFO-modules x Ndelay)) x 2
TSLOT ≥ 150 + ((5 x 7.5) + (6 x 9)) x 2 ≥ 333 bit times
Example 2: 6 Mbps, 25 km FO cable (total ring or line length), 10 units in cascade, robust mode
TSLOT ≥MaxTSDR + ((FOlength x FOdelay) + (NFO-modules x Ndelay)) x 2
TSLOT ≥ 450 + ((10 x 30) + (10 x 36)) x 2 ≥ 1470 bit times
2.9 Fiber ports and Ring
The two fiber ports are one fiber channel in the B2FOR+ and B4FOR+. Each port can be individually enabled or
disabled with the switches below the ports (see Fig. 14). If one of the two ports is not used, for example in a line
structure, make sure to disable the unused port to prevent signal errors. If the port is on but no cable is
connected, this can trigger a ‘No signal’ alarm.
If the ‘Ring’ switch is on, then both fiber ports must be enabled and connected to ring ports of other
compatible Hubs.