Radwin RW2025 User Manual
Configuring the GSU Chapter 11
Site Configuration: GPS Sync Unit
This window is the main GSU configuration tool:
Figure 11-8: Site Configuration: GPS Sync Unit
The 1000 and 2000 labels refer to WinLink 1000 and RADWIN 2000 radios,
respectively. The actual annotation seen may vary, but the intention should
Note
be clear.
1. Setting the RFP for HSS
The GSU is automatically configured as HSS Master (HSM).
Ensure that no other collocated ODU is configured as HSM.
Note
If the hub site consists only of WinLink 1000 units, then any suitable RFP may be chosen.
If there are one or more RADWIN 2000 units, you must use RFP B or E.
The permitted RFPs are also dependent on channel bandwidth and are color coded as follows:
You May use RFP/
Channel
Bandwidth
combinations with
this color
For these collocated radios
WinLink 1000 only
RADWIN 2000 only
WinLink 1000 and RADWIN 2000 together
None - unavailable
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Configuring the GSU Chapter 11
There is a further restriction: If there are two distributed sites transmitting to each other,
they must both use the same RFP. This requirement, together with use of shifted transmission phase (item 3 below), ensures that communicating distributed sites to not interfere
with each other by transmitting simultaneously.
Two GSU managed sites transmitting with shifted transmission phase and using the same
RFP, transmit one half a RFD apart (see Figure 11-3 above).
2. Setting the Tx Transmission Ratio
Since the GSU is always HSM, it must be able to cater for hub site RADWIN 2000 C based
links. (See the RADWIN 2000 User Manual, Chapter 5). If you use asymmetric allocation,
shifted transmission phase becomes unavailable and you cannot “cascade” links as
described in step 1.
3. Choosing the Transmission Phase
Chose the Transmission Phase in accordance with considerations in step 1 above. If you
choose Shifted Phase then the Asymmetric Ratio selector is disabled.
Site Configuration: Management
Figure 11-9: Site Configuration: Management
Here you set the GSU IP address, subnet mask and gateway. You also set trap addresses
here. It is identical to the corresponding panel for WinLink 1000.
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Configuring the GSU Chapter 11
Site Configuration: Inventory
Figure 11-10: Site Configuration: Inventory
Site Configuration: Security
You can only change the SNMP Community stings:
Figure 11-11: Site Configuration: Security
Site Configuration: Date and Time
ODU Recent events, alarms and traps are time-stamped from the time method chosen here
(NTP, managing computer, ODU default).
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Configuring the GSU Chapter 11
Figure 11-12: Setting the date and time for trap reporting
Site Configuration: Operations
The only available action here is Restore System Defaults:
Figure 11-13: Site Configuration: Operations
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GSU Preferences Chapter 11
GSU Preferences
The Preferences window adds a new tab for the GSU:
Figure 11-14: Site Configuration: Operations
You may chose the units for latitude/longitude coordinates.
GSU Monitoring and Diagnostics
The monitoring and diagnostic reports are similar to those of WinLink 1000.
GSU Telnet Support
To configure the GSU with Telnet, start a Telnet session, using
telnet <GSU_ipaddr>.
For example, if you run Telnet as follows,
telnet 192.168.222.20
you will be asked for a user name and password. Y ou must log on with administr ator privilege
under user name,
The available commands are the same as for WinLink 1000 with the addition of four additional display commands and three additional set commands.
The additional display commands are
admin
and password
netman
.
display rfp
display ratio
display tx_phase
display gpsinfo
The last one display gpsinfo, is the most interesting:
admin@192.168.222.20-> display gpsinfo
Current GPS time 102941.000
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Software Update for GSUs Chapter 11
Current GPS latitude 51.500000
Current GPS N\S Indicator N
Current GPS longitude 0.000000
Current GPS E\W Indicator E
Current GPS number of satellites 09
Current GPS altitude 84.0
Command "display gpsinfo" finished OK.
The three additional set commands are
set rfp <index> (2-6)
set ratio <ratio>
set tx_phase <mode:1=normal,2=shifted>
Software Update for GSUs
All GSUs in a distributed site can be updated simultaneously. Use an IP list as described in
Chapter 15.
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RADWIN 2000
Broadband Wireless Transmission System
USER MANUAL
RELEASE 2.5.40
Part 3: Advanced Installation
UM 2000-2540/02.11
Chapter 12
Monitored Hot Standby
Installation Procedure
What is a RADWIN Monitored Hot Standby
The RADWIN Monitored Hot Standby (MHS a.k.a 1+1) is a duplicated link set up as a primary
link and a secondary link in hot standby mode as shown in Figure 12-1 below.
Figure 12-1: RADWIN Monitored Hot Standby
RADWIN 2000 User Manual Release 2.5.40 12-1
What RADWIN MHS provides Chapter 12
RADWIN MHS provides redundancy and backup to TDM services. It is designed to provide
high reliability high-capacity Point-to-Point links. The RADWIN MHS is -
• Designed to provide redundancy and high reliability for carrier class operators
• Optimized for high capacity links operating in license-free bands
• A comprehensive solution providing protection against both equipment failure and loss
of air interface, by simple connectivity between a primary link and a secondary link
The main service redundancy features of the RADWIN MHS are –
• TDM service cut-over from the primary to the secondary link is completely automatic
• TDM service cut-over time no more than 50 ms
• Automatic restore to primary link as soon as it becomes available
• Support for up to sixteen TDM channels for RADWIN 2000 and four TDM channels for
WinLink 1000.
MHS is supported between -
• two WinLink 1000 links
• two RADWIN 2000 links
• a WinLink 1000 link and a RADWIN 2000 link.
What RADWIN MHS provides
Equipment Protection
Equipment protection is provided for the electrically-active network elements, ODU and IDU.
The primary IDU and the secondary IDU are connected by a cable to monitor failure and to
control protection switching. Switching time is less than 50ms.
When connecting two WinLink 1000 links as 1+1, one dual-polarization antenna can be
shared by the primary link and the secondary link.
Air-Interface Protection
Air-Interface protection is unique to RADWIN and is optimized for wireless links operating in
license-free bands.
The primary link and the secondary link use different frequency channels. If the air-interface
of the primary link is disturbed and cannot carry the required TDM service, then the system
automatically switches to the secondary link.
In addition, improved robustness and frequency planning flexibility is achieved, as the primary and secondary air interfaces can operate in the same frequency band or in different frequency bands.
Automatic Channel Selection (ACS) can be configured for each link to add additional robustness.
The primary and secondary links are synchronized using Hub Site Synchronization (HSS).
It is recommended that both sites be installed with HSS cables. If HSS fails at one site, it can
be operated from the other site by remote configuration.
RADWIN 2000 User Manual Release 2.5.40 12-2
Purpose of this Chapter Chapter 12
Purpose of this Chapter
This chapter is an installation and maintenance guide for RADWIN MHS. It applies to all RADWIN radio products able to support the Monitored Hot Standby operational mode.
Who Should Read this
This chapter is intended for persons responsible for the installation and maintenance of RADWIN MHS. To use it you need to know how to -
• Install a WinLink 1000 radio link
• Install a RADWIN 2000 radio link
• Use the RADWIN Manager software
RADWIN MHS Kit Contents
• One Y-Connection Patch Panel
• One MHS cable
Figure 12-2: RADWIN Y-Connection Patch Panel
Installing a RADWIN MHS
The following procedure is substantially generic to all RADWIN radio
products. Differences between WinLink 1000 and RADWIN 2000 class
products will be stated explicitly. What you see on your running RADWIN
Note
Figure 12-1 above is a schematic of a RADWIN MHS. Figure 12-3 shows how to connect
the IDUs to the Patch Panel.
Manager may differ in some details from the screen captures used to
illustrate this chapter.
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Installing a RADWIN MHS Chapter 12
Figure 12-3: How to connect the IDUs to the Patch Panel
•With RADWIN 2000 links yo u can protect up to 16 TDM ports. To pro-
tect more than eight TDM ports use two Patch Panels at each site.
• Ethernet services are carried independently by primary and second-
Note
ary links. Each link carries different Ethernet traffic. MHS does not
protect Ethernet traffic.
In what follows, it will be assumed that –
1. We will depart from our usual Site A / Site B conventions. Sites A and B on the primary link
will be Sites 1.2 and 1.4 respectively. The corresponding sites on the secondary link will be
Sites 2.2 and 2.4. The site names reflect their IP addresses. This is a useful convention and
is reflected in the screen captures below.
2. The link will be managed from Site 1.2; Site 1.4 may be a remote site.
3. The links intended as the primary and secondary will be referred to their respective names,
Primary Link and Secondary Link as shown in Figure 12-1 above, despite their having yet
to be installed.
To install a Hot Standby Link:
1. Set up Primary Link in the usual way. Ensure that it is fully operational in accordance
with the relevant instructions in Part 1 of the User Manual.
Do not proceed unless this condition is fully met!
Note
2. Connect user equipment to Site 1.4.
3. At Site 1.2, disconnect the TDM cables from the external equipment or disconnect
external equipment from the Hot Standby Patch Panel.
4. The HSS cable (connecting the ODUs) should be connected at Site 1.2. The ODU
belonging to the primary link should be configured as HSM, whereas the ODU
belonging to the secondary link should be configured as HSC-CT.
5. Establish Secondary Link in the usual way, with HSS enabled. The two link fre-
quencies should be at least 5MHz apart.
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Installing a RADWIN MHS Chapter 12
6. Connect the MHS cables at Sites A and B as shown in Figure 12-1 and Figure 12-
3 above.
7. Run the Configuration Wizard for Primary Link. Activate TDM services in the usual
way. Navigate to the Hot Standby tab, in the Services Configuration panel:
Figure 12-4: Services Configuration Panel: Hot Standby mode selection
Check the Primary button to configure Primary Link as the primary link.
8. Complete the Wizard, and then move to Secondary Link.
9. Repeat step 7 for Secondary Link. For the Services Hot Standby tab, this time, check
the Secondary button.
10. Complete the Wizard.
11. At Site 1.2, reconnect the Hot Standby Patch panel to the external equipment.
From this point on, we will simply refer to primary and secondary link (no capitalized names).
At the end of the process, the RADWIN Manager main windows should look like this:
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Installing a RADWIN MHS Chapter 12
Figure 12-5: The primary link under normal operation
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Installing a RADWIN MHS Chapter 12
Figure 12-6: The secondary link under normal operation
To see what happens following a cut-over from the primary link to the secondary link, you
need to have running two copies of the RADWIN Manager – one logged into the primary link,
and one logged into the secondary link.
Here then, is the situation after a cut-over to the secondary link:
For the primary link, the following window will appear for a few seconds:
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Installing a RADWIN MHS Chapter 12
Figure 12-7: Primary link a few seconds before regular No-Link display
It will then revert to the standard No-Link-available window.
On the secondary link Manager window, you will see a window like this:
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Maintaining a RADWIN MHS Link Chapter 12
Figure 12-8: Secondary Link operating as the Hot Standby link
Notice that the active link notice is highlighted in red, so that there is no mistaking which link
is operational.
Maintaining a RADWIN MHS Link
IDU Replacement
There are two situations, which must be treated differently.
Situation 1:
To replace either of the IDUs at Site 1.4 or the IDU at Site 2.2, nothing special is required.
Simply disconnect the IDU to be replaced – and replace it with a new one. Replacing a secondary link IDU obviously has no effect on the TDM service. Disconnecting the Site 1.4 primary IDU activates Hot Standby. After the Site 1.4 primary IDU is replaced, the Link will
detect the change and switch back to the primary link.
If you replaced the Site 2.2 IDU, remember to reconnect the MHS cable.
Situation 2:
Replacing the Site 1.2 IDU is different, and requires several steps.
To replace the Site 1.2 primary link IDU:
1. Power off the Site 1.2 IDU. This activates the secondary link using Hot Standby.
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ODU Replacement Chapter 12
2. Run the Configuration manager on the secondary link, and in the Hot Standby panel
of Figure 12-4 above, check the Disabled button.
3. Replace the Site 1.2 IDU without connecting it to the ODU (to prevent transmission
by the primary link with the undefined IDU).
4. Reconnect the MHS cable between the IDUs at Site 1.2.
5. Again, run the Configuration Wizard on the secondary link, and in the panel of
Figure 12-4 above, check the Secondary button to re-enable the link as secondary.
6. Connect the new Site 1.2 IDU to its ODU.
The Hot Standby will automatically revert to the primary link within 50ms.
ODU Replacement
Both the primary and secondary replacement ODUs require pre-configuration prior to insertion into the link. The items to be pre-configured are
•HSS mode
•Link ID
•Frequency
• Hot Standby mode – using the new Services panel in Figure 12-4 above
• IP address (optional)
Pre-configuration must be carried out before the new ODU is
connected to its IDU. If you try to do it “live” against its IDU, it will
Note
cause spurious transmissions and a service break.
To pre-configure an ODU:
1. Attach the new ODU to an IDU or a PoE device.
2. Run the RADWIN Manager and use Hot Standby tab of Figure 12-4 above to configure the new ODU to Primary or Secondary mode as required.
3. Ensure that it is set to the proper HSS mode in accordance with Figure 12-4 above.
Enter the required Link ID and frequency.
To replace an ODU for primary or secondary link, at either site:
• Install the pre-configured ODU. (Since the other link is working normally, nothing
need be done with it. If the secondary ODU was replaced, TDM service remains as is
on the primary link. If the primary ODU was replaced, then the TDM service will shift
back to the primary link.)
Switching Logic
Switching from Primary Link to Secondary Link
Switching from primary link to secondary link will occur following:
• Loss of the primary air interface due to sync loss
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Switching from Primary Link to Secondary Link Chapter 12
• Loss of the primary air interface due to failure of the receiver to acquire expected E1/
T1 data during a period of 24ms
• The Primary equipment (either ODU or IDU, local or remote) is powered off
Following the switch from the primary to the secondary link, the primary and secondary link
Manager main windows should look like this:
Figure 12-9: Primary link after the switch over to secondary link (After a few seconds the display moves to No-Link display, with TDM ports grayed out. )
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Switching back from the Secondary to the Primary Link Chapter 12
Figure 12-10: Secondary link operating after the switch over to secondary. (After a few
moments the TDM icons become green. )
Switching back from the Secondary to the Primary Link
Switching back from the secondary link to the primary link will occur after the primary link has
become and remains fully functional for a continuous period of at least one second. F ollowing
reversion from the secondary link to the primary link, the Manager main windows should look
like this:
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Switching back from the Secondary to the Primary Link Chapter 12
Figure 12-11: Primary link operating after the switch back from secondary
RADWIN 2000 User Manual Release 2.5.40 12-13
System Operation description Chapter 12
Figure 12-12: Secondary Link operating after the switch back to Primary
System Operation description
• TDM services are carried by the primary link
Normal operation
Switching to backup
Backup operation • TDM services are carried by the secondary link
Switching back to
primary
• The secondary link (equipment and air interface) is operating but not carrying user traffic
•TDM ports on the secondary IDUs are tri-state
• Switching to secondary will occur in the following cases:
• Loss of the primary air interface due to sync loss
• Loss of the primary air interface due to failure of the receiver to acquire expected
TDM data during a period of 24ms
• Primary equipment power off (either ODU or IDU, local or remote)
• The switching result would be:
• TDM ports on the primary IDUs turn to tri-state
• TDM ports on the secondary IDUs become active
• Switching back to primary will occur as soon as the Primary link is fully functional for 1
second
RADWIN 2000 User Manual Release 2.5.40 12-14
Chapter 13
The RADWIN Ethernet
Ring
Scope
The description of RADWIN Ethernet Ring in this Chapter is completely generic: Both WinLink
1000 and RADWIN 2000 links may participate in an Ethernet ring.
VLAN IDs are used by RADWIN products in three separate contexts:
Management VLAN, Traffic VLAN and Ethernet Ring. It is recommended that
Caution
What is an Ethernet Ring
you use different VLAN IDs for each context.
An Ethernet ring consists of several nodes connected by hops (links). Loops are not allowed
with Ethernet; therefore one hop is a Ring Protection Link (RPL) which “blocks” Ethernet
traffic. In the event of failure in the ring, the Ring Protection Link unblocks and Ethernet traffic in the ring is restored.
Some terminology:
• Normal State – all member links are functional except the RPL which is blocked.
• Blocked - the air-link is up but Ethernet traffic is not transmitted across the link. The
Ethernet service panel for the RPL in the RADWIN Manager is labeled Idle
• Unblocked - Ethernet traffic is transmit ted across the RPL. The Ethernet service
panel for the RPL in the RADWIN Manager is labeled Active
• Protection State – a member link is broken and the RPL passes Ethernet traffic
• Ring Protection Link - as described above
• Ring Link - any member link controlled by the RPL
• Independent Link - not subject to ring protection
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RADWIN Ethernet Ring Chapter 13
• Ring Protection Message (RPM) - control message used to monitor and control the
ring.
RPM messages are broadcast, so it is essential (to prevent flooding) to
associate the RPL and member Ring LInks with a VLAN ID. This requires in
Note
turn, that equipment used in the ring either supports VLAN or can
transparently pass through VLAN tagged packets.
RADWIN Ethernet Ring
The following figure describes the RPL behavior during a ring failure and recovery cycle.
Figure 13-1: Ring Protection mechanism
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RADWIN Ethernet Ring Chapter 13
The steps below follow the numbering in Figure 13-1:
1. Normal operation
Ethernet traffic runs in the ring, but does not pass through the RPL, which is blocked. The
RPL does however, broadcast RPM packets through the ring.
2. Ring Link down, RPL notified
The RPL detects a link-down condition by the non-arrival of an RPM packet. It remains
blocked for the Minimum time for failure detection which is configurable using the
RADWIN Manager (see page 13-9).
3. Ring Link down, RPL unblocked for traffic
The RPL unblocks for Ethernet traffic after the Minimum time for failure detection
expires and no RPM message has been received.
4. Ring Link restored but still blocked for traffic
The Ring Link is restored, but remains blocked for the Minimum time for recovery, set
using the RADWIN Manager, to avoid rapid fluctuations leading to potential short term
loops (see page 13-9).
5. Ring Link restored, RPL blocked for traffic
The RPL blocks to Ethernet traffic after the Minimum time for recovery expires and
restores Ethernet traffic to the Ring Link (with a special RPM packet).
Return to 1.) Ring Link restored, RPL blocked for traffic
The ring is back to normal operation.
With RADWIN links, RADWIN’s Ring Protection solution prevents Ethernet loops in the ring at
all times. The ring is always broken somewhere.
• Under a ring configuration a RADWIN Ring Link that was down and commences recovery, keeps blocking Ethernet traffic. The RPL identifies this situation, blocks itself and
then unblocks the other Ring Link. This is the transition from step 4 to 5 in
Figure 13-1.
• If the failed hop is not a RADWIN
• If the hop Ring Link can signal that it is down by issuing a Loss of Signal (LOS) at
the Ethernet port, then the RPL will control the RADWIN link connected to that
port in the same manner as described above, to prevent an Ethernet loop.
• Otherwise, there may be a short loop period when the RPL is still open for traffic
and the Ring Link is also unblocked during the Minimum time for recovery.
link then there are two possibilities:
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Ethernet Ring Topologies Supported by RADWIN Chapter 13
Ethernet Ring Topologies Supported by RADWIN
The following ring topologies are supported:
Table 13-1: Topologies supported by RADWIN Ethernet Ring
The ring is not connected to other rings
Stand-alone ring
One of the nodes is connected to another network / ring:
Single-homed ring
Dual-homed ring
Two adjacent nodes are connected through a non-RADWIN link (e.g. micro
wave or fiber):
Note:
• The network has to be layer 2 and support VLANs
• The ring control broadcasts RPM packe ts. Hence it i s recommend ed to
prevent these packets from propagating into the network
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Ethernet Ring Topologies Supported by RADWIN Chapter 13
Table 13-1: Topologies supported by RADWIN Ethernet Ring (Continued)
Some of the hops are connected through non-RADWIN links:
Mixed ring
Some of the hops are connected through RADWIN links with PoE devices, not
supporting ring functionality:
Repeater sites
Shared ring
RADWIN rings with shared hops.
Note:
• A RADWIN link hop can be a part of up to 4 rings
• The RPL cannot be a shared link
• The two RPLs should use different Minimum Time for Acti vation v alues
to prevent duplicate action causing a loop
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Protection Switching Chapter 13
Protection Switching
Protection switching occurs upon failure in the ring.
The Ethernet service restoration time depends on the number of hops in the ring. With four
hops the Ethernet service is restored in less than 50 ms.
In single and dual homed topologies the service restoration may take longer due to the aging
time of the external switches. Switches that are immediately aware of routing changes reduce
the restoration time.
Hardware Considerations
Ethernet Ring Protection is supported by the IDU-C, IDU-E and PoE.
A typical Ring Protection Link consists of an IDU-C or new style IDU-E, a PoE and two ODUs
as shown in Figure 13-2. Hence one end of the RPL and of ring controlled links, as shown in
Figure 13-2 has to be an IDU. It is recommended to have an IDU at each node to have the
flexibility to change the RPL.
A ring node is built from two ODUs from adjacent links. The ODUs can be connected to either
an IDU or to a PoE device as in Figure 13-2. Port names in the IDU are shown.
Figure 13-2: Node with IDU and PoE device
Connect the switch at the site only to one IDU.
Note
The switching function is carried out by the IDU-Cs and IDU-Es, both of which provide Layer
2 support (see Chapter 14).
Special Case: 1 + 1 Ethernet Redundancy
The same device may be used to provide economic 1 +1 redundancy for a single link.
A 1+1 Ethernet is a ring with two nodes. One of the links is RPL.
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Using RADWIN Manager to Set up a Ring Chapter 13
The equipment in a 1+1 Ethernet installation is as follows:
Figure 13-3: 1+1 Ethernet
Figure 13-4: Using IDU-C or IDU-E with PoEs for the RPL
Notice that link content drops from four PoEs plus two switches to two PoEs and two IDU-Cs
or IDU-Es.
Using RADWIN Manager to Set up a Ring
Creating a Ring using RADWIN Manager requires two stages:
6. Set up each participating link separately, in the usual way
7. For each link, run the Configuration wizard to define it as RPL or a Ring Link
• The Ring uses a VLAN ID for the RPL. It is used to manage the Ring
and nothing else; it is completely separate from the management
and traffic VLANs referred to elsewhere
Note
Here then, is step 2 in more detail:
• A regular Ring Link may be a member of up to four rings and each of
their RPL VLAN IDs must be configured
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Using RADWIN Manager to Set up a Ring Chapter 13
To integrate a link into an Ethernet Ring:
1. Using either the Installation or Configuration wizards, navigate to the Services window and chose the Ring tab.
Figure 13-5: Services window with Ring selected
2. Click Configure. The Ring definition window is displayed. The default is Independent Link and is used when the link is not part of any Ring.
Figure 13-6: Ring Options
3. To configure the link as a regular Rink link, click Rink Link (Non- RPL) and enter
the ring LAN VIDs (at least one) to which it belongs and click OK:
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Using RADWIN Manager to Set up a Ring Chapter 13
Figure 13-7: Configuring Ring LAN VIDs
4. To configure the link as RPL, click Ring Protection Link (RPL) and enter its Ring
VID.
Figure 13-8: Configuring RPL VIDs
5. Enter the minimum times for failure detection and recove ry.
For dual-homed configurations, where part of the ring goes through the core, if a
core segment fails, the core should be allowed to recover before the RPL enters Protection State. Otherwise, it could happen that both the core and the RADWIN ring
will switch in parallel. You should therefore, configure a Mi nimum time for failure
detection high enough to take this possibility into account.
The Minimum time for recovery is a delay switch to prevent r a pid “on-o ff” fluctuations. It functions like a delay switch use to protect electrical devices from rapid
“on-off” power fluctuations, which in this context, may lead to potential short term
loops.
6. Click OK to accept your settings.
RADWIN 2000 User Manual Release 2.5.40 13-9
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