Polycom RealPresence 4000 Operating and maintenance instructions

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RealPresence Collaboration Server (RMX)
4000 Quick Installation & Configuration Guide
General Safety Precautions
Follow these rules to ensure general safety:
• Keep the area around the Polycom RealPresence Collaboration
Server (RMX) 4000 unit clean and free of clutter and well ventilated.
• Decide on a suitable location for the equipment rack that will hold
the RMX, ensuring that it is near a grounded power outlet.
• Ensure that the leveling jacks on the bottom of the rack are fully
extended to the floor with the full weight of the rack resting on
them. Always make sure the rack is stable before extending a
component from the rack.
• In a single rack installation, attach stabilizers to the rack. In
multiple rack installations, the racks should be coupled together.
• Use a regulating uninterruptable power supply (UPS) to protect the
RMX from power surges and voltage spikes, and to keep it
operating in the event of a power failure.
• Allow the power supply units to cool before touching them.
• Always keep the rack’s trays and boards closed when not servicing
to maintain proper cooling.
• Use only the power cords supplied with the system.
• Each power cord should only be connected to a power outlet that
has a protective ground contact.
•The product name, RealPresence® Collaboration Server 4000
and RMX® 4000 are used interchangeably throughout this
document.
•For regulatory notices, see the Polycom® RealPresence®
Collaboration Server (RMX®) 4000 Hardware Guide.
•For all safety requirements and precautions, see the
RealPresence Collaboration Server (RMX) 4000 Hardware
Guide, "Safety Requirements” on page 1-8.

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Preparations
Obtain the following information from your network administrator:
• IP addresses, Subnet Mask and Default Gateway IP address
(optional) for the RMX Control Unit and RMX Shelf Management.
• IP addresses for the RMX Signaling Host and Media cards.
• Gatekeeper IP address.
• SIP server IP address, if applicable.
If ISDN/PSTN is installed in your conferencing environment, obtain the
following information from your ISDN/PSTN Service Provider:
• Switch Type, Line Coding and Framing, Numbering Plan and
Numbering Type.
• Dial-in number range.
Unpacking the RMX
1When you receive the RMX packing case, inspect the equipment for
damage and verify that the components match the packing slip.
2Unlock and lift the RMX top cover.
Make sure that the Installation Accessories kit contains the power
cables and a USB Key and that the Rack Installation Accessories kit
contains the accessories for installing the RMX in 19” racks. For
details, see the Getting Started Guide, "Telescopic Rail Runners
Accessory Kit” on page 2-9.
3Remove the boxes that are placed on the top Stratocell® and the top
Stratocell® and open the anti-static plastic bag wrapping the RMX.
4Holding the handle on each side, lift the RMX from the box, and
place it on a flat surface or in a rack. Remove any packaging
material prior to positioning the RMX.
If the RMX is connected to the public ISDN Network, an external
CSU or similar equipment is needed.
Attention:
Two people are required to lift the MCU out of the box and when
installing it in a rack.

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Management Network Configuration on the USB
Key
The system is shipped with the following default IP addresses:
• Control Unit IP address – 192.168.1.254
• Shelf Management IP Address – 192.168.1.252
• Control Unit subnet mask – 255.255.255.0
• Default Router IP Address – 192.168.1.1
When the RMX is installed for the first time, you must change the
default IP addresses to your local network settings. This can be done by
modifying the default settings in the LAN Configuration Utility on the
USB key shipped with the unit.
1Insert the USB key provided with your system into the PC.
The Polycom Documentation window opens.
In Windows XP:
aThe Polycom Documentation option is automatically selected.
Click OK.
In Windows 7:
aSelect Open Folder to view files using Windows Explorer.
bDouble-click the index.hta file.
2In the Language Menu window, select the documentation language.
3In the License Agreement window, click the Accept Agreement
button.
4In the Product Type window, select RMX 4000.
5In the Initial Setup Utility, click the Lan Configuration Utility
hyperlink.
6In the LanConfigUtility dialog box, modify the required network
parameters in the utility’s dialog box using the information
supplied by your network administrator and click OK.
Write down the RMX’s serial number that is on a sticker on the back
of the unit. It will be needed for product registration later in the
installation process.

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7Remove the USB Key from the PC.
The USB key is required for first entry power-up of the RMX.
Installing the RMX
To install the RMX 4000 in a 19”rack using chassis runners:
1Install chassis runners supplied by Polycom, in the rack. For details,
see the RealPresence Collaboration Server (RMX) Getting Started Guide,
"Installing the Telescopic Rail Runners on the Rack” on page 2-7.
2Mount the RMX 4000 on top of the rack brackets.
3Secure the RMX to the rack with screws through the holes in the
RMX’s front mounting brackets. For details, see the RealPresence
Collaboration Server (RMX) Getting Started Guide, "Installing the
RealPresence Collaboration Server (RMX) 4000” on page 2-19.
Connecting the cables to the RMX 4000
Connect the following cables to the RMX 4000 rear panel:
•For AC Power Supply connections: Insert a power cable in each of
the three AC Power Entry Modules (PEM’s).
For DC Power connections, see the Hardware Guide.
•For a detailed description of the safety requirements and
precautions and the installation of the RMX 4000 as a
standalone, mounted in a 23” rack, or reverse mounting the
RMX 4000 on a 19” rack, see the Hardware Guide.
•To connect the RMX 4000 to the DC power, see the
RealPresence Collaboration Server (RMX) 4000 Hardware
Guide, "Connecting the RMX 4000 to -48DC SELV Power” on
page 1-19.
•If your system package includes the RTM ISDN card, it is
recommended to install it before mounting the RMX on the
rack. Refer to the RealPresence Collaboration Server (RMX)
1500/2000/4000 Getting Started Guide for installation
instructions.
The size of the protective earthing conductor & cable should be a
minimum of 10AWG.

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•OntheRTM IP-4000:
—Connect the Management Network cable to LAN 2.
—Connect the Signalling cable to LAN 3.
—Connect the Shelf Management cable to LAN 6.
• For each installed RTM LAN - Connect the LAN cable to LAN 2.
• For each installed RTM ISDN:
—Connect the E1/T1 cables to their PRI Ports.
—Connect the LAN cable to LAN 1.
First Entry Power-up
1Insert the USB Key with the modified IP addresses into the USB
port on the back panel.
2Turn ON the power by pressing on the power switch located on the
rear panel of the RMX.
The FAN STATUS and PWR STATUS LEDs turn ON.
System power-up sequence may take approximately 10 minutes.
During this time, the parameters in the lan.cfg file are uploaded
from the USB key to the RMX’s memory and applied during the
power-up sequence.
Wait for the upload process to complete. Initially, all the ERR/
RDY/ACT LEDs flicker and flash. Upload is completed when all
the LEDs turn off and only the red ERR LED (on the CTNL unit)
remains ON.
It remains ON until the Default IP Network Service is configured.
Do not remove the USB key from the RMX until the connection
with the RMX is established.
•LAN 4, LAN 5 and the Serial ports are only for debugging and
not for customer use.
•Do not remove the protective plastic caps from LAN 1, LAN 4
and LAN 5 ports.

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Product Registration and Activation Key Retrieval
Before starting the initial configuration process, register the MCU and
all the software licenses at the Polycom Resource Center website and
download the product activation key file to the computer you will use
for the configuration:
1Using a Web browser, connect to http://portal.polycom.com.
2Login with your Email Address and Password or register as a new
user.
3Select the Product Registration link.
4Follow the on-screen instructions for Product Registration and
Product Activation.
5Write down the Product Activation Key number or copy it for later
use.
Connecting to the MCU
1Start the Collaboration Server Web Client application on the
workstation by entering in the browser’s address line the IP
Address of the control unit as defined in the USB key in the format:
http://<Control Unit IP Address> and pressing Enter.
2Once the connection with the RMX is established and the RMX Web
Client Welcome screen is displayed, you can remove the USB key
from the RMX.
3In the Welcome screen, enter the default Username (POLYCOM)
and Password (POLYCOM) and click Login.
The Product Activation dialog box is displayed with the serial
number filled in.
4Select the “I accept the license agreement” check box to enable
Online Registration of your product.
5In the Activation Key field, enter or paste the Product Activation Key
retrieved earlier and click OK.
If you do not have an Activation Key, click the Polycom Resource
Center button to access the Service & Support page of the Polycom
Support website.

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A message indicating that the Product Activation Key was loaded
successfully appears. The red ERR LED on the Media card turns
OFF and the green RDY LED turns ON.
As no Default IP Network Service is defined, the system
automatically starts the Fast Configuration Wizard.
Initial System Configuration
The Fast Configuration Wizard that is automatically started enables you
to configure the Default IP Service.
The IP Management Service tab in the Fast Configuration Wizard is enabled
only if the default Management IP addresses were not modified.
1In the Fast Configuration Wizard - IP dialog box, define the following
parameters:
2Click Next.
•IPv4 is the default protocol for setting the Network Service in the
Fast Configuration Wizard.
•If Secured Communication is required on the RMX: complete the
Fast Configuration Wizard, Login, install the Certificate and then
enable the Secured Communication Mode.
Field Description
IP Service
Name
Use the default name (Default IP Service) or enter a name
using up to 20 characters.
Note: This field is displayed in all dialog boxes.
Signaling Host
IP Address
Enter the IP address of the Central Signaling host. This is
the address used by endpoints for dialing in to the MCU.
Media Card 1/2/
3/4 IP Address
Enter the IP address(es) of the media card (s): MPMx 1,
MPMx 2, MPMx 3 and MPMx 4 (if installed), as provided
by the network administrator. Endpoints connect to
conferences and transmit call media (video, voice and
content) via these addresses.
Subnet Mask Enter the subnet mask of the MCU.
Default value: 255.255.255.0.

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3In the Fast Configuration Wizard - Routes dialog box, enter the IP
address of the default router.
4Click Next.
5Enter the required DNS information in the dialog box.
6Click the Next button.
7In the Fast Configuration Wizard - Environment dialog box, select the
IP Network Type: H.323,SIP or H.323 &SIP.
8Click Next.
9If you selected SIP only, go to Step 12.
Field Description
MCU Host Name Enter the name of the MCU on the network.
Default name is RMX.
DNS Select:
•Off – if DNS servers are not used in the
network.
•Specify – to enter the IP addresses of the DNS
servers.
Note: The IP address fields are enabled only if
Specify is selected.
Register Host
Names
Automatically to
DNS Server
Select this option to automatically register the
MCU Signaling Host and Shelf Management with
the DNS server.
Local Domain
Name
Enter the name of the domain where the MCU is
installed.
Primary DNS
Server IP Address
The static IP addresses of the primary DNS server.

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10 In the Fast Configuration Wizard - Gatekeeper dialog box, enter the
required information:
11 If you selected H.323 only, go to Step 15.
Otherwise, click Next.
Field Description
Gatekeeper Select Specify to enable configuration of the
gatekeeper IP address.
When Off is selected, all gatekeeper options are
disabled.
Primary Gatekeeper
IP Address or
Name
Enter either the gatekeeper’s host name (if a DNS
Server is used) or IP address.
MCU Prefix in
Gatekeeper
Enter the string with which the MCU registers itself with
the gatekeeper.
The gatekeeper uses this string to identify the MCU
when forwarding calls to it. H.323 endpoints use this
number as the first part of their dial-in string when
dialing the MCU.
Aliases
Alias The alias by which the RMX’s Control Unit is identified
within the network. Up to five aliases can be defined for
each RMX.
Note: When a gatekeeper is specified, at least one
prefix or alias must be entered in the table.
Type Select the type that defines the format in which the card
alias is sent to the gatekeeper according to your
gatekeeper’s capabilities.
Note: H.323 and E.164 are the most commonly used
types.

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12 In the Fast Configuration Wizard - SIP dialog box, set the following:
13 Click the Next button.
14 Enter the required Security information in the dialog box.
Field Description
SIP Server Select:
•Specify – to manually configure SIP servers.
•Off – if SIP servers are not present in the network.
SIP Server IP
Address
Enter either the IP address of the preferred SIP server
or its host name (if a DNS server is used).
Transport Type Select the protocol that is used for signaling between
the MCU and the SIP Server or the endpoints
according to the protocol supported by the SIP Server:
UDP – Select this option to use UDP for signaling.
TCP – Select this option to use TCP for signaling.
TLS – Select this option to use the secured
communication where the Signaling Host listens on-
secured port 5061 only. The supported security
protocols are: TLS 1.0, SSL 2.0 and SSL 3.0.
Field Description
SIP
Authentication
Click this check box to enable authentication with the SIP
server.
Select this check box only if the authentication is enabled
on the SIP proxy.
User
Name
Enter the user name the RMX will use to
authenticate itself with the SIP proxy. This
name must be defined in the SIP proxy.
These
fields can
contain up
to
20 ASCII
characters
Password Enter the password the RMX will use to
authenticate itself with the SIP proxy. This
password must be defined in the SIP proxy.

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15 Click the Save & Continue button.
During the initial RMX setup, if the system detects the presence of the
RTM ISDN card, the ISDN /PSTN Network Service definition screens of
the Fast Configuration Wizard are enabled.
If there is no RTM ISDN card in the RMX or if you do not want to define
an ISDN/PSTN Network Service, go to Step 31.
The Fast Configuration Wizard’s ISDN/PSTN configuration sequence
begins with the ISDN/PSTN dialog box.
H.323
Authentication
Click this check box to enable H.323 server
authentication.
Select this check box only if the authentication is enabled
on the gatekeeper, to enable the Collaboration Server to
register with the gatekeeper.
Leave this check box cleared if the authentication option
is disabled on the gatekeeper.
User
Name
Enter the user name the Collaboration
Server will use to authenticate itself with the
gatekeeper. This name must be defined in
the gatekeeper.
These
fields can
contain up
to 64
ASCII
characters
Password Enter the password the Collaboration
Server will use to authenticate itself with the
gatekeeper. This password must be defined
in the gatekeeper.
A new ISDN/PSTN Network Service can be defined even if no RTM
ISDN card is installed in the system but only via the ISDN/PSTN
Network Service ->Add New Service dialog box.
Field Description

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16 Define the following parameters:
17 Click Next.
18 In the PRI Settings dialog box, define the following parameters:
Field Description
Network Service
Name
Specify the service provider’s (carrier) name or any other
name you choose, using up to 20 characters. The
Network Service Name identifies the ISDN/PSTN Service
to the system.
Default name: ISDN/PSTN Service
Note: This field is displayed in all ISDN/PSTN Network
Properties tabs and can contain character sets that use
Unicode encoding.
Span Type Select the type of spans (ISDN/PSTN) lines that are
connected to the RMX. Select either: T1 or E1
Default: T1
Note: Only one Span Type (E1 or T1) is supported on the
RMX.
Service Type PRI is the only supported service type. It is automatically
selected.
Field Description
Default Num
Type
Select the Default Num Type from the list.
The Num Type defines how the system handles the
dialing digits.
If the PRI lines are connected to the RMX via a network
switch, the Num Type is used to route the call to a
specific PRI line.To let the network interpret the dialing
digits for call routing, select Unknown (Default).
For E1 spans, this parameter is set by the system.

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19 Click Next.
20 In the Span Definition dialog box, define the following parameters:
Num Plan Select the type of signaling (Number Plan) according to
information given by the service provider.
Default: ISDN
For E1 spans, this parameter is set by the system.
Net Specific Select the appropriate service program if one is used by
your service provider (carrier).
Some service providers may have several service
programs that can be used.
Default: None
Dial-out Prefix Enter the prefix that the PBX requires to dial out. Leave
this field blank if a dial-out prefix is not required.
The field can contain be empty (blank) or a numeric
value between 0and 9999.
Default: Blank
Field Description
Framing Select the Framing format used by the carrier for the
network interface from the list.
•For T1 spans, default is SFSF.
•For E1 spans, default is FEBE.
Side Select the RMX side on the network.
Default: User side
If the PBX is configured on the network side, then the
RMX unit must be configured as the user side, and
vice versa, or both must be configured symmetrically.
Line Coding Select the PRI line coding method from the list.
•For T1 spans, default is B8ZS.
•For E1 spans, default is HDB3.
Field Description

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21 Click Next.
The Phones dialog box opens.
22 To define dial-in number ranges, click the Add button.
23 In the Add Phone Number dialog box, define the first and the last
numbers in the phone number range.
24 Click OK.
The new range is added to the Dial-in Phone Numbers table.
25 Optional. Repeat steps 22 to 25 to define additional dial-in ranges.
26 Enter the MCU CLI (Calling Line Identification).
With dial-in connections, the MCU CLI indicates the MCU’s
number dialed by the participant. In a dial-out connection,
indicates the MCU (CLI) number as seen by the participant.
27 Click Save & Continue.
After clicking Save & Continue, you cannot use the Back button to
return to previous configuration dialog boxes.
The ISDN/PSTN Network Service is created and confirmed.
28 Click OK to continue the configuration.
The Spans dialog box opens.
29 Click the check boxes in the Attached field to attach spans (E1 or T1
PRI lines) to the network service named in the Network Service Name
field.
Switch Type Select the brand and revision level of switch
equipment installed in the service provider’s central
office.
•For T1 spans, default is AT&T 4ESS.
•For E1 spans, default is EURO ISDN.
Note: For T1 configurations in Taiwan, Framing must
be set to ESF and Line Coding to B8ZS.
•A range must include at least two dial-in numbers.
•A range cannot exceed 1000 numbers.
Field Description

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The Spans Table displays the configuration of all spans and all ISDN
network services in the system. In the Fast Configuration Wizard
only the first ISDN/PSTN Network Service is defined and Spans can
only be attached to this service.
Each ISDN RTM card can support either 7 E1 or 9 T1 PRI lines.
30 Click Next.
The RMX Time dialog box is displayed.
31 Set the RMX time using one of the three available options.
Field Description
GMT Date The date at Greenwich, UK.
Local Time The RMX’s local time settings, calculated from the GMT
Time and the GMT Offset.
GMT Time Displays the RMX’s current GMT Time settings.
Option 1: Manually setting the RMX time:
•Using the arrows modify the GMT Time and the
GMT Offset to set the RMX time.
GMT Offset Displays the time zone difference between Greenwich
and the RMX’s physical location.
•Using the arrows modify the GMT Offset time on the
RMX.
Retrieve Client
Time
Option 2: Automatically setting the RMX time:
•Click this button to automatically update the RMX's
GMT Date, Time and Offset to match that of the
workstation.
Use NTP Server Option 3: Setting the RMX time by synchronizing with
external NTP servers:
•Select this check box to synchronize the time with
up to three external NTP servers.
•Enter the IP addresses of the required NTP servers
in order of precedence.
The Status field indicates whether registration with the
NTP Server failed or succeeded.

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32 Click Next.
The Administrator User dialog box is displayed.
33 Enter the required Administrator User information:
34 Click Next.
The System Flags dialog box is displayed.
35 In the Fast Configuration Wizard - System Flags dialog box, enter the
following information:
Field Description
New User Name Enter the new user name of the new administrator
user.
New Password Enter the password for the new administrator user.
Confirm Password Enter the same password again to confirm its
accuracy.
Flag Value
Conference ID Length
(MCU)
The number of digits of the Conference ID that will
be assigned by the MCU.
Range: 2-16 (Default: 5)
Note: Selecting 2 digits limits the number of
simultaneous ongoing conferences to 99.
Minimum Conference
ID Length (User)
The minimum number of digits
that the user must enter when
manually assigning a numeric ID
to a conference.
Range: 2-16 (Default: 4)
Selecting 2
digits limits the
number of
simultaneous
ongoing
conferences to
99.
Maximum Conference
ID Length (User)
The maximum number of digits
that the user can enter when
manually assigning a Numeric
ID to a conference.
Range: 2-16 (Default: 8)

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These flags can be modified later, if required, via the Setup menu’s
System Configuration option. For more information, see the RMX
1500/2000/4000 Administrator’s Guide, “System Configuration Flags”.
36 Click Save & Close.
The RMX confirms successful configuration.
37 In the Success Message box, click OK.
38 In the Reset Confirmation dialog box, click Yes.
39 In the Please wait for system reset message box, click OK.
System restart may take up to 10 minutes.
40 Refresh the browser periodically until the Login screen is displayed.
41 When the Login screen is displayed, enter the new Username and
Password and click Login.
The Collaboration Server Web Client opens.
An MCU State indicator displays a progress indicator showing the
time remaining until the system start-up is complete.
When the default RMX User is replaced, the RMX Time is set and if
there are no System Errors, the green RDY LED on the CNTL unit
(on the RMX’s front panel) turns ON and the ERR LED is OFF.
MCU Display Name The MCU name that appears at the endpoints.
Default: Polycom RMX 4000.
Terminate Conference
when Chairperson Exits
Yes/No (Default: Yes)
Auto Extend
Conferences
When Yes is selected (default) allows conferences
running on the RMX to be automatically extended
as long
as there are participants connected and
there are available resources.
The speed and transmit/receive mode of the LAN ports are
automatically identified by the system. If the specific switch requires
it, modify these settings in the Ethernet Settings dialog box. For more
details, see the RealPresence Collaboration Server (RMX) 1500/
2000/4000 Administrator’s Guide.
Flag Value

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Selecting the RMX Web Client Languages
By default, the RMX Web Client interface is displayed only in English.
However, the system administrator can choose the languages available
for selection on the Login screen.
To customize the Multilingual Setting:
1On the RMX menu, click Setup > Multilingual Setting.
The Multilingual Setting dialog box is displayed.
2Place check marks in the boxes of the languages to be available for
selection.
3Click OK.
4Log out and Log in for the customization to take effect.
Conferencing Entities
The RMX is shipped with one Entry Queue and four Meeting Rooms:
• Entry Queue DefaultEQ whose ID is 1000, and it is used to access
the default Meeting Rooms
• Four Meeting Rooms whose IDs are 1001, 1002, 1003 and 1004.
The default conferencing entities are set to CP conferencing at a line rate
of 384 kbps, Auto Layout, Polycom Skin and a duration of one hour.
The default Entry Queue (EQ) is set to Ad Hoc conferencing which
allows participants to start new conferences by entering a Conference or
Meeting Room ID that are not used for any other conferencing entities
defined or running on the MCU.
For IP conferencing, these conferencing entities can be used to start new
conferences without any additional settings.
If ISDN/PSTN endpoints are participating in the conferences a dial-in
number must be manually assigned to the conferencing entities.
The Fast Configuration Wizard configures the Default IP Network
Service with common parameters. Advanced settings should be
performed once the initial configuration is complete. For detailed
description of the IP Network Services, see the RealPresence
Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide.

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The default Entry Queues and Meeting Rooms can be customized or
additional conferencing entities can be added according to your
organization’s requirements. For more details on various conferencing
entities, see the RealPresence Collaboration Server (RMX) 1500/2000/4000
Administrator’s Guide.
To start ongoing conferences and monitor their status see the
RealPresence Collaboration Server (RMX) 1500/2000/4000 Getting Started
Guide, Chapter 3 “Basic Operation”.
Connecting to a Conference Directly or via Entry
Queue
The RMX is shipped with pre-configured default CP (AVC-based)
conferencing entities that can be used to dial in and start conferences.
Default (Transit) Entry Queue ID: 1000, default Meeting Room IDs:
1001, 1002, 1003, and 1004.
H.323 Participants
H.323 participants dial:
[MCU Prefix in Gatekeeper][Conference or Entry Queue ID/Name].
For example, if the MCU prefix in gatekeeper is 925, you can dial in to
the default Entry Queue by entering 925 or 9251000 and be routed to
Meeting Rooms by entering its ID (i.e. 1001, 1002, 1003 or 1004).
You can connect directly to one of the default Meeting Rooms by dialing
its number, for example, 9251001.
Alternatively, you can use the Entry Queue or conference name to
connect directly to the conference. For example, if the conference name
is Maple_Room, the participant can dial 925Maple_Room.
SIP Participants
The dialing string is composed of the conference routing name as
registered with the SIP server and domain name in the following
format: conference_name@domain_name.
For example, if the conference name is Maple_Room, the participant
dials [e-mail].

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ISDN/PSTN Participants
ISDN and PSTN participants can connect to conferences and Meeting
Rooms directly or via an Entry Queue by dialing one of the numbers
(including the country and area code if needed) assigned to them. When
connecting to an EQ they are routed to their conference according to the
conference ID. For example, if the assigned dial in number is 4045555,
the ISDN/PSTN participant dials this number with the appropriate area
code (for example, 678) and country code (001).
Conference Control Using DTMF Codes
Operation DTMF String
Individual Help *0
Conference Help 00
Mute My Line *6
Unmute My Line #6
Increase Broadcast Volume *9
Decrease Broadcast Volume #9
Increase Listening Volume *76
Decrease Listening Volume #76
Play Help Menu *83
Start Click&View to modify personal layout **
Change To Chairperson *78
Show Number of Participants *88
Invite a participant to the conference *72
Disconnect the last invited participant #72
DOC2726A