Avaya Media Dependent Adapters (MDAs) User's Manual
Contents
1. 10519EA 26 Table 12 describes the BPS2000 2GE MDA front panel components Table 12 BPS2000 2GE MDA front panel Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port 2 Activity Port activity LEDs green Blinking indicates network activity for the port Off No activity BPS2000 1GT MDA The BPS2000 1GT MDA Figure 11 has one 1000 BASE T gigabit ethernet port 27 Figure 11 BPS2000 1GT MDA Front Panel BPS2000 1GT MDA OO B Eb si pia BPS2000 1GT MDA 10522EA Table 13 describes the BPS2000 1GT MDA front panel components Table 13 BPS2000 1GT MDA front panel Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port 2 Activity Port activity LEDs green Blinking Indicates network activity level for the corresponding port Off No activity 28 BPS2000 2GT MDA The BPS2000 2GT MDA Figure 12 has two 1000 BASE T gigabit ethernet ports Figure 12 BPS2000 2GT SFP GBIC MDA Front Panel BPS2000 2GT MDA 00 mi SE M BPS2000 2GT MDA 10523EA Table 14 describes the BPS2000 2GT MDA front panel compo2. On green Valid 100 Mb s communications link Off No link activity 2 Activity Port activity LEDs green On Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously Off No activity 3 100BASE FX port connectors The BPS2000 2FX MDA uses LC connectors Quad port 100BASE FX MDAs The quad port 100BASE FX MDAs use four longwave 1300 nm MT RJ connectors to attach devices over 62 5 125 micron multimode fiber optic cable Figure 5 shows the front panels of the 400 4FX MDA and the 8100 4FX MDA Figure 5 400 4FX and 8100 4FX MDA front panels 400 4FX MDA 8100 4FX MDA BS45072A Table 6 describes the 400 4FX MDA and the 8100 4FX MDA front panel components Table 6 400 4FX MDA 8100 4FX MDA description ltem Label Description 1 Link Communications link LEDs green On Valid communications link Off Invalid communications link or no connection to this port Blinking The corresponding port is management disabled 2 F Dx Full duplex port status LEDs green On The corresponding port is in full duplex mode Off The corresponding port is in half duplex mode 3 Activity Port activity LEDs green Blinking Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appe
3. 0BASE FX a foile elio T BX TX BX 8100 2FX MDA O BS45071A 11 Table 4 describes the dual port 400 2FX MDA and the 8100 2FX MDA front panel components Table 4 400 2FX MDA and 8100 2FX MDA description Item Label Description 1 Link Communications link LEDs green On Valid communications link Off Invalid communications link or no connection to this port Blinking The corresponding port is management disabled F Dx Full duplex port status LEDs green On The corresponding port is in full duplex mode Off The corresponding port is in half duplex mode Activity Port activity LEDs green Blinking Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously 100BASE FX port connectors Models 400 2FX and 8100 2FX use LC connectors Figure 4 shows the front panel of the dual port BPS2000 2FX MDA Figure 4 BPS2000 2FX MDA front panel BPS2000 2FX MDA ES 100BASE FX 100BASE FX E lele telel EE O O Aciviy Di BE MPA BPS20001A Table 5 describes the dual port BPS2000 2FX MDA front panel components Table 5 BPS2000 2FX MDA description ltem Label Description 1 Link Link status LEDs green
4. 1000BASE LX Multimode Applications on page 40 Caution MDAs are not hot swappable To avoid damage to the switch or MDA power down the switch or unplug the switch module from the switch backplane before installing or removing an MDA Supported interfaces and products Table 1 shows the interface types used with the MDAs described in this guide Table 1 MDAs and interface types See MDA Interface Type page 400 4TX MDA 10BASE T 100BASE TX UTP 5 8100 4TX MDA BPS2000 4TX MDA 400 2FX MDA 100BASE FX Fiber 9 8100 2FX MDA BPS2000 2FX MDA 400 4FX MDA 8100 4FX MDA BPS2000 4FX MDA 450 1SR MDA 1000BASE SX 17 450 1SX MDA Shortwave gigabit fiber 450 1LR MDA 1000BASE LX 20 450 1LX MDA Longwave gigabit fiber 450 1GBIC MDA Gigabit Interface Converter GBIC 23 BPS2000 2GE MDA Small Form Factor Pluggable SFP 26 GBIC 1000BASE SX LC Type 1000BASE SX MT RJ Type 1000BASE LX LC type BPS2000 1GT MDA 1000Base T 27 BPS2000 2GT MDA 29 MDA descriptions This section describes the following MDAs e 10BASE T 100BASE TX MDAs on page 5 e 100BASE FX MDAs on page 9 e 1000BASE X MDAs on page 17 e GBIC MDA on page 23 e BPS2000 2GE MDA on page 26 e BPS2000 1GT MDA on page 27 e BPS2000 2GT MDA on page 29 10BASE T 100BASE TX MDAs The 10BASE T 100BASE TX MDAs use four RJ 45 8 pin modular connector
5. 991 Vfg 46 1992 VCCI Class A ITE EN55024 1998 CISPR24 1997 of procedures other than those specified herein may result in hazardous radiation exposure Caution Use of controls or adjustments or performance Caution Only qualified technicians should install this equipment Place all printed circuit boards on an antistatic mat until you are ready to install them If you do not have an antistatic mat wear a discharge leash to free yourself of static before touching any of the printed circuit boards or free yourself of static by touching a grounded metal object before handling a printed circuit board Product Safety Meets requirements of CSA 22 2 No 950 M95 UL 1950 3rd ed EN60950 1992 A1 1993 A2 1993 A3 1995 A4 199721CFR Chapter I EN60825 1 1994 A11 1996 A Warning Fiber optic equipment can emit laser or infrared light that can injure your eyes Never look into an optical fiber or connector port Always assume that fiber optic cables are connected to a light source A Warning Vorsicht Glasfaserkomponenten k nnen Laserlicht bzw Infrarotlicht abstrahlen wodurch Ihre Augen gesch digt werden k nnen Schauen Sie niemals in einen Glasfaser LWL oder ein AnschluBteil Gehen Sie stets davon aus daf das Glasfaserkabel an eine Lichtquelle angeschlossen ist Warning Avertissement L quipement fibre A optique peut mettre des rayons laser ou infrarouges qui risquent d entra ner de
6. IC MDA front panel and GBICs 23 Figure 9 450 1GBIC MDA Front Panel 5 m Phy A LL mn 450 1GBIC MDA 450 1GBIC MDA GBIC model with extractor tabs GBIC model with extractor handle SC connector BS450102A 24 Table 11 describes the 450 1GBIC MDA front panel components Table 11 450 1GBIC MDA description Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port Blinking The corresponding port is management disabled 2 Phy Phy status LEDs green On The corresponding Phy port is active Off The corresponding Phy port is in backup mode or there is no connection to this port 3 Activity Port activity LEDs green Blinking Indicates network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously 4 GBIC Host port see MDA descriptions on page 5 25 BPS2000 2GE MDA The BPS2000 2GE MDA Figure 10 has two Host ports for Small Form Factor Pluggable SFP Gigabit Interface Converters GBICs SFP GBICs are hot swappable input output enhancement components that link Gigabit Ethernet ports with fiber optic networks Figure 10 BPS2000 2GE SFP GBIC MDA Front Panel BPS2000 GE MDA D 2 am e I I BPS2000 GE MDA
7. Part No 302403 H October 2001 4401 Great America Parkway Santa Clara CA 95054 Installing Media Dependent Adapters MDAs NORTEL NETWORKS 3 0 2 4 0 3 He Copyright 2001 Nortel Networks All rights reserved October 2001 The information in this document is subject to change without notice The statements configurations technical data and recommendations in this document are believed to be accurate and reliable but are presented without express or implied warranty Users must take full responsibility for their applications of any products specified in this document The information in this document is proprietary to Nortel Networks Inc Trademarks Nortel Networks the Nortel Networks logo Passport BayStack Business Policy Switch 2000 and the Globemark and are trademarks of Nortel Networks Adobe and Acrobat Reader are trademarks of Adobe Systems Incorporated Statement of conditions In the interest of improving internal design operational function and or reliability Nortel Networks Inc reserves the right to make changes to the products described in this document without notice Nortel Networks Inc does not assume any liability that may occur due to the use or application of the product s or circuit layout s described herein EMI Compliance Meets requirements of FCC Part 15 Subparts A and B Class A EN55022 1998 CISPR22 1997 Class A General License VDE 0871 Class B AmtsblVfg No 243 1
8. SR MDA single MAC MDA with a separate redundant Phy backup Phy port Only one Phy port can be active at any time If the active Phy port fails the redundant Phy port automatically becomes the active port 450 1SX MDA single PHY MDA Figure 7 shows the 450 1SR MDA and the 450 1SX MDA front panels Figure 7 450 1SR and 450 1SX MDA front panels 450 1SR MDA 1 port redundant 1000BASE SX 1000BASE SX o el lel lel TX RX ES BX 450 1SR MDA 450 1SX MDA single port 1000BASE SX 10 10 TX RX 2222 m pst mm Activiy O 5 mm Phy mm Activity I 450 1SX MDA BS45044A Table 9 describes the 450 1SR MDA and the 450 1SX MDA front panel components Table 9 450 1SR 450 1SX MDA description Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port Blinking The corresponding port is management disabled 2 Phy Phy status LEDs green or Phy Select On The corresponding Phy port is active Off The corresponding Phy port is in backup mode or there is no connection to this port 3 Activity Port activity LEDs green Blinking Indicates network activity level for the corresponding port A
9. ar to be on continuously 4 100BASE FX port connectors Models 400 4FX and 8100 4FX use MT RJ connectors Figure 6 shows the front panel of the BPS2000 4FX MDA Figure 6 BPS2000 4FX MDA front panel BPS2000 4FX MDA ram QE als Beem c c BPS2000 4FX MDA O I BPS20002A Table 7 describes the BPS2000 4FX MDA front panel components Table 7 BPS2000 4FX MDA description ltem Label Description 1 Link Link status LEDs green On green Valid 100 Mb s communications link Off No link activity 2 Activity Port activity LEDs green On Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously Off No activity 3 100BASE FX port connectors The BPS2000 4FX MDA uses MT RJ connectors 1000BASE X MDAs The following are the 1000BASE FX MDAs Table 8 1000BASE FX MDAs 450 1SR MDA page 18 450 1SX MDA page 18 450 1LR MDA page 21 450 1LX MDA page 21 Shortwave gigabit Longwave gigabit For a complete list of MDAs see Table 1 on page 4 For installation instructions see Installing an MDA on page 31 Shortwave Gigabit MDAs The following 1000BASE SX MDAs conform to the IEEE 802 3z 1000BASE SX standard and use shortwave 850 nm fiber optic connectors to connect devices over multimode 550 m 1805 ft fiber optic cable e 450 1
10. describes the 450 1LR MDA and the 450 1LX MDA front panel components Table 10 450 1LR and 450 1LX MDA description Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port Blinking The corresponding port is management disabled 2 PHY Phy status LEDs green or Phy Select On The corresponding Phy port is active Off The corresponding Phy port is in backup mode or there is no connection to this port 3 Activity Port activity LEDs green Blinking Indicates network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously 4 1000BASE X LC port connectors see 1000BASE LX Multimode Applications on page 40 for special requirements 22 GBIC MDA The 450 1GBIC MDA Figure 9 has a single Host port for Gigabit Interface Converters GBICs GBICs are hot swappable input output enhancement components that link Gigabit Ethernet ports with fiber optic networks For more information about GBICs see the publication Installing Gigabit Interface Converters GBICs part number 312865 A For instructions on installing the 450 1GBIC MDA in a network device see Installing an MDA on page 31 For instructions on installing a GBIC in a 450 1GBIC MDA see Installing a GBIC in an MDA on page 34 Figure 9 shows the 450 1GB
11. ee GBIC MDA on page 23 To remove an installed GBIC gt Do one of the following Ifthe GBIC has spring tabs Figure 9 on page 24 press in on the tabs on each side of the GBIC as you pull the GBIC out of the MDA s Host port Figure 15 35 Figure 15 Removing a GBIC with spring tabs SL e If the GBIC has an extractor handle Figure 9 on page 24 grasp the handle and pull firmly to remove the GBIC from the MDA s Host port Installing a Small Form Factor Pluggable SFP GBIC This section lists the steps to install a SFP GBIC To install a SFP GBIC 1 Remove the SFP GBIC from its protective packaging 2 Verify that the SFP GBIC is the correct model for your network configuration Remove the dust cover from the SFP GBIC s optical bores Grasp the SFP GBIC between your thumb and forefinger 5 Insert the SFP GBIC into the slot on the front panel of the Gigabit Ethernet switching module 36 Figure 16 Installing the LC GBIC into an MDA 10517FA 37 Note SFP GBICs are keyed to prevent incorrect insertion Removing a Small Form Factor SFP GBIC This section lists the steps for removing a GBIC To remove a GBIC 1 Disconnect the network fiber cable from the SFP GBIC connector 2 Depending on your SFP GBIC model either pull the LC extraction tab located in the front of the SFP GBIC below right with your thumb and forefinger or press the button on the bottom of the MT RJ SFP GBIC b
12. elow left Figure 18 Removing a SFP GBIC Bottom view 10518FA 38 3 Slide the SFP GBIC out of the Gigabit Ethernet module slot If the SFP GBIC does not slide easily from the module slot use a gentle side to side rocking motion while firmly pulling the SFP GBIC from the slot 5 Dispose of the SFP GBIC according to all national laws and regulations Note If you are storing a SFP GBIC remember to place a dust cover over the fiber optic bores 39 1000BASE LX Multimode Applications For 1000BASE LX multimode applications the longwave gigabit transceivers must be mode conditioned externally via a special offset SMF MMF patch cord With the offset SMF MMF patch cord you can use the same transceiver for both multimode and single mode fiber For more information about the SMF MMF patch cord see your Nortel Networks sales representative The 1000BASE LX transceiver is designed to mechanically accommodate the single mode ferrules used on one end of the special offset SMF MMF patch cord Multimode ferrules must not be used because they can bind and cause damage to the transceiver Do not connect multimode cables directly into the 1000BASE LX MDA transceiver Instead connect a special offset SMF MMF patch cord into the transceiver and then connect the multimode cable into the SMF MMF patch cord 40
13. high level of network activity can cause LEDs to appear to be on continuously 4 1000BASE X LC port connectors Longwave Gigabit MDAS The following 1000BASE LX MDAs conform to the IEEE 802 3z 1000BASE LX standard and use longwave 1300 nm fiber optic connectors to connect devices over single mode 5 km 3 1 mi or multimode 550 m 1805 ft fiber optic cable e 450 1LR MDA single MAC MDA with a separate redundant Phy backup Phy port Only one Phy port can be active at any time If the active Phy port fails the redundant Phy port automatically becomes the active port e 450 1LX MDA single Phy MDA Note The optical performance of this transceiver cannot be guaranteed when connected to a multimode fiber plant without the use of the special offset SMF MMF mode conditioning patch cord For more information see 1000BASE LX Multimode Applications on page 40 Figure 8 shows the 450 1LR MDA and the 450 1LX MDA front panels 20 Figure 8 450 1LR and 450 1LX MDA front panels 450 1LR MDA 1 port redundant 1000BASE LX 1000BASE LX lo ol 0 0 TX RX 1 BX 450 1LR MDA 450 1LX MDA single port 1000BASE LX O O TX RX 21 Fu EE E Activity il mm Phy mm Act l 450 1LX MDA BS45045A Table 10
14. king The corresponding port is management disabled 10BASE T port status LEDs green On The corresponding port is set to operate at 10 Mb s Off The link connection is bad or there is no connection to this port Blinking The corresponding port is management disabled Full duplex port status LEDs green On The corresponding port is in full duplex mode Off The corresponding port is in half duplex mode Port activity LEDs green Blinking Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously Table 2 400 4TX and 8100 4TX MDA front panel continued ltem Label Description 5 10BASE T 100BASE TX RJ 45 8 pin modular port connectors Figure 2 shows the front panel of the BPS2000 4TX MDA Figure 2 BPS2000 4TX MDA front panel amp oo oS eee 100 Di CO Activity BPS2000 4TX MDA Table 3 describes the BPS2000 4TX MDA front panel components 9792EA Table 3 BPS2000 4TX MDA description Item Label Description 1 10 100 10BASE T 100BASE TX port status LEDs On green The corresponding port is set to operate at 100 Mb s On yellow The corresponding port is set to operate at 10 Mb s Table 3 BPS2000 4TX MDA description continued Item Label Description 2 Off The link connection is bad or there is no con
15. nection to this port Activity Port activity LEDs green Blinking green Indicates the network activity level for the corresponding port A high level of network activity can cause LEDs to appear to be on continuously Off No traffic to this port 10BASE T 100BASE TX RJ 45 8 pin modular port connectors 100BASE FX MDAs The 100BASE FX MDAs conform to the IEEE 802 3u 100BASE FX standard and can attach fiber based 100 Mb s connections to Fast Ethernet devices The 100BASE FX MDAs do not support single mode fiber cable The following are the 100BASE FX MDAs 400 2FX MDA dual port page 11 400 4FX MDA quad port page 14 8100 2FX MDA dual port page 11 8100 4FX MDA quad port page 14 BPS2000 2FX MDA dual port page 13 BPS2000 4FX MDA quad port page 16 For a complete list of MDAs see Table 1 on page 4 For installation instructions see Installing an MDA on page 31 Dual port 100BASE FX MDAs The dual port 100BASE FX MDAs use two longwave 1300 nm LC connectors to attach devices over 62 5 125 micron multimode fiber optic cable Figure 3 shows the front panels of the 400 2FX MDA and the 8100 2FX MDA Figure 3 400 2FX and 8100 2FX MDA front panels 400 2FX MDA 100BASE FX 100BASE FX a Melle ello may I TX Fe ES BX 400 2FX MDA 8100 2FX MDA 100BASE FX 10
16. nents Table 14 BPS2000 2GT MDA front panel Item Label Description 1 Link Communication link LEDs green On Valid communications link Off The communications link connection is bad or there is no connection to this port 2 Activity Port activity LEDs green 29 Table 14 BPS2000 2GT MDA front panel continued ltem Label Description Blinking Indicates network activity level for the corresponding port Off No activity 30 Installing an MDA Before you begin installing an MDA see MDA descriptions on page 5 for specific information about your MDA The Uplink Expansion Module slot on supported switches accommodates a single MDA using the following connectors Table 15 MDA cable connectors RJ45 LC MT RJ RJ45 MDA UTP fiber fiber STP 10 100BASE TX X page 5 100BASE FX page 9 X X 1000BASE SX page 17 1000BASE LX page 17 GBIC MDA page 23 X BPS2000 2GE MDA X X page 26 BPS2000 1GT page 26 X BPS2000 2GTpage 29 Caution MDAs are not hot swappable To avoid damage to the switch or MDA power down the switch or disconnect the switch module from the switch backplane before installing or removing an MDA To install an MDA 31 1 Unplug the AC power cord from the back of the switch or unplug the switch module from the switch backplane 2 Loosen the thumb screws and remove the filler panel or previously installed MDA from the Uplink E
17. s configured as media dependent interface crossover MDI X connectors These ports connect over straight cables to the network interface controller NIC card in a node or server similar to a conventional Ethernet repeater hub If you connect to another Ethernet hub or Ethernet switch you need a crossover cable unless an MDI connection exists on the associated port of the attached device The following are the 10BASE T 100BASE TX MDAs e 400 4TX MDA page 6 e 8100 4TX MDA page 6 BPS2000 4TX MDA page 8 For a complete list of MDAs see Table installation instructions see Installing Figure 1 shows the front panels of the 4 8100 4TX MDA 1 on page 4 For an MDA on page 31 00 4TX MDA and the Figure 1 400 4TX and 8100 4TX MDA front panels 400 4TX MDA 8100 4TX MDA mm mm mm mom mici 400 4TX MDA mom mA 8100 4TX MDA BS45042B The 10BASE T 100BASE TX MDA ports can operate at either 10 Mb s or 100 Mb s The port speed is determined through autonegotiation with its connecting device Table 2 describes the 400 4TX and 8100 4TX MDA front panel Table 2 400 4TX and 8100 4TX MDA front panel Item Label Description 1 100 3 F Dx 4 Activity 100BASE TX port status LEDs green On The corresponding port is set to operate at 100 Mb s Off The link connection is bad or there is no connection to this port Blin
18. s l sions oculaires Ne jamais regarder dans le port d un connecteur ou d un c ble fibre optique Toujours supposer que les c bles fibre optique sont raccord s une source lumineuse Warning Advertencia Los equipos de fibra ptica A pueden emitir radiaciones de l ser o infrarrojas que pueden da ar los ojos No mire nunca en el interior de una fibra ptica ni de un puerto de conexi n Suponga siempre que los cables de fibra ptica est n conectados a una fuente luminosa Warning Avvertenza Le apparecchiature a fibre A ottiche emettono raggi laser o infrarossi che possono risultare dannosi per gli occhi Non guardare mai direttamente le fibre ottiche o le porte di collegamento Tenere in considerazione il fatto che i cavi a fibre ottiche sono collegati a una sorgente luminosa ABR PSII HONTE EDS He E RABIA HAUTE RSV EEN TO O L Eo TIREN Introduction This guide describes and provides installation instructions for Nortel Networks media dependent adapters MDAs It contains the following topics Supported interfaces and products next MDA descriptions on page 5 Installing an MDA on page 31 Replacing an installed MDA on page 33 Installing a GBIC in an MDA on page 34 Removing an Installed GBIC from an MDA on page 35 Installing a Small Form Factor Pluggable SFP GBIC on page 36 Removing a Small Form Factor SFP GBIC on page 38
19. umbscrews on the MDA front panel 4 Plug the AC power cord into the back of the switch or plug the switch module into the switch backplane 5 Attach devices to the MDA ports For instructions on attaching devices to the MDA ports refer to the publication for your switch Installing a GBIC in an MDA Before installing a GBIC see GBIC MDA on page 23 for specific information about your MDA The 450 1GBIC MDA Host port is covered with a spring loaded filler panel that rotates out of the way as you push the GBIC into place You can install or replace a GBIC in an operating 450 1GBIC MDA without turning off power to the switch Caution Although GBICs are hot swappable MDAs are not To avoid damage to the switch or MDA power down the switch or unplug the switch module before installing or removing an MDA For more information about GBICs see the publication Installing Gigabit Interface Converters GBICs part number 312865 A To install a GBIC in an MDA 1 Remove the GBIC from its protective packaging 2 Insert the GBIC into the MDA Host port Figure 14 34 GBICs are keyed to prevent improper insertion If the GBIC resists pressure do not force it Remove it turn it over and reinsert it Figure 14 Installing a GBIC 3 Press on the front of the GBIC until it snaps into place 4 Remove the rubber plug to connect cables Removing an Installed GBIC from an MDA For a description of the GBIC MDA s
20. xpansion Module slot 3 Insert the MDA into the Uplink Expansion Module card guides Figure 13 Make sure the MDA slides in on the card guides Failure to align the MDA to the card guides could damage the pins Figure 13 Installing an MDA my 400 4TX MDA 1 Card guides 2 Uplink module slot BS45059C 32 Press the MDA firmly into the Uplink Expansion Module slot Be sure that the MDA is fully seated into the mating connector Secure the MDA by tightening the thumb screws on the MDA front panel Plug the AC power cord into the back of the switch or plug the switch module into the switch backplane Attach devices to the MDA ports For instructions on attaching devices to the MDA ports refer to the publication for your switch After connecting the port cables follow the instructions to connect power and verify the installation Note The IEEE 802 3u specification requires that all ports operating at 100 Mb s use only Category 5 unshielded twisted pair UTP cabling Replacing an installed MDA To replace an installed MDA 1 Unplug the AC power cord from the back of the switch or unplug the switch module from the switch backplane Remove the installed MDA Loosen the two thumbscrews on the MDA front panel to remove the MDA Install the replacement MDA 33 Be sure to firmly tighten the two th
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