AHT-E300 ADSL Router
User Manual
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Table of Contents
Chapter 1. Introduction ------------------------------------------------
1
Features --------------------------------------------------------
Package Contents ---------------------------------------------
System Requirements ----------------------------------------
Front Panel LEDs ---------------------------------------------
Rear Panel -----------------------------------------------------
Chapter 2. Preparing ADSL Router Settings ----------------------
2.1 Hardware Installation ------------------------------------
Hardware Installation ----------------------------------------
General ADSL Connection Setup --------------------------
2.2 Network Setup --------------------------------------------
Network Setting ----------------------------------------------
Chapter 3. Web-based Management ---------------------------------
Appendix I. Specifications --------------------------------------------
Appendix II. Troubleshooting -----------------------------------------
2
2
2
3
3
4
5
5
5
6
6
8
30
31
Troubleshooting Flow Chart -------------------------------- 31
Solution 1 ------------------------------------------------------ 32
Solution 2 ------------------------------------------------------ 32
Solution 3 ------------------------------------------------------ 33
Solution 4 ------------------------------------------------------ 33
Solution 5 ------------------------------------------------------ 34
Other Troubles ------------------------------------------------ 35
Appendix III. Glossary -------------------------------------------------- 36
This device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received
(3) Including interference that may cause undesired operation.
* Microsoft Windows is a registered trademark of Microsoft Corporation in the United
States and other countries.
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AHT-E300 ADSL ROUTER
Chapter
1
Introduction
This chapter introduces features, component and
panel layout of the AHT-E300 ADSL Router and
explains the structure of this guide.
1
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AHT-E300 ADSL ROUTER
Thank you for purchasing Samsung AHT-E300 ADSL Router. This guide describes the
installation and basic configuration of the AHT-E300 ADSL Router.
Features
Automatic IP Configuration with DHCP Server/Client functions
Internet phone, Internet Game, Netmeeting and Internet Messenger support
Interoperable with ANSI T1.413 Issue 2, G.DMT and G.LITE specification
Compatible with major DSLAM in the world including DSLAM of BEZEQ
8 PVCs (simultaneous and encapsulation independent)
VPI/VCI range 0-255, 0-65536
Encapsulation hunting of up to 8 pre-defined VPI/VCI & encapsulation sets
AAL5 UBR & CBR
OAM F4/F5
Package Contents
AHT-E300 ADSL Router
System Requirements
One Active ADSL Internet connection
One PC with 10Mbps, 100Mbps or 10/100 Mbps Ethernet card
TCP/IP protocol stack installed in the PC or Mac
Microsoft Internet Explorer 4.0 or later, or Netscape 4.0 or later
(Internet Explorer 5.0 and Netscape 4.7 or later is highly recommended)
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The Front Panel LEDs
RXD
LNK
LAN
Power
LED
Status
Description
On
Off
On
Power on
Power
No power
LAN connection is active.
LAN
RXD
LAN connection is not
active.
Off
Blinking Data is being transferred.
Off
Data is not transferred.
Modem is trying to sync
with DSLAM.
Blinking
On
LNK
(ADSL)
ADSL sync is finished.
The Rear Panel
Port
Description
Connect RJ-11 cable to ASDL
port of micro-filter
Line
LAN
Line
Connection to PC.
Use the supplied RJ-45 Straight
Through Cable.
Phone
Reset
(Optional)
Pressing the Reset Switch and
holding it for 5-seconds will
restore the factory default
settings.
Reset
Power
DC in
LAN
Power Turn on or off the power.
Connect the supplied Power
Adapter.
DC in
3
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Chapter
2
Preparing ADSL Router Settings
This chapter describes preparing ADSL Router
settings, such as Hardware Installation and Network
Settings for PC.
4
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Hardware Installation
2.1
The connection diagram below is the example that you can configure network using AHT-
E300 ADSL Router. Install and connect your AHT-E300 ADSL Router in order as follows:
Hardware Installation
1. Connect the Connect the AC Power Adapter cord into the power jack on the rear
Power
panel of the AHT-E300 ADSL Router and plug the adapter into the
power source. Check the Power LED is flashing.
Warning: Use the supplied power adapter (DC 14V) only to
prevent the permanent failure of AHT-E300 ADSL Router.
2. Connect the To use the phone service and ADSL service simultaneously, install
Micro-Filter
the micro-filter to the wall-jack.
Warning: If you don’t use the micro-filter to your phone service, the
service quality of phone service may be degraded.
3. Connect the Interconnect the supplied RJ-11 cable between LINE port of the
ADSL Line
modem and ADSL port of the micro-filter.
4. Connect the Interconnect the supplied RJ-45 Straight-though Ethernet Cable
RJ-45 Straight between LAN port of the modem and LAN port of the PC or Mac.
through cable
General ADSL Connection Setup #1
AHT-E300
Micro
Phone
Filter
LINE
ADSL
RJ-11
Cable
RJ-45 Straight
Trough Cable
LAN
Power Jack
5
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General ADSL Connection Setup #2
AHT-E300
Micro
Filter
LINE
Phone
ADSL
RJ-11
Cable
RJ-45 Straight
Trough Cable
LAN
Power Jack
Network Settings for PC
2.2
Network Setting
Step 1
After clicking [Start] button in Taskbar, select Settings and then Control
Panel.
Notice: These instructions apply to PCs installed with MS-Windows ME
only. Linux or Macintosh machine may have different steps from
mentioned in this Guide. Please refer to the operating system’s manual.
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Step 2
Double-clicking the Network icon in Control Panel, the following
window will appear.
Step 3
In the Configuration tab, you can see several network components under
The following network components are installed:. Make it sure that a
network adapter connected with AHT-E300 ADSL Router appears in the
list of the network components.
Notice: The network adapter must be installed in order to progress the
setting. If the network adapter is not installed, contact customer support
of the network adapter.
Step 4
Double click TCP/IP.
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Step 5
Click [TCP/IP Properties] button, and IP address tab.
You can choose one of the following options to set TCP/IP values.
Obtain an IP address If you want to obtain an IP address of PC
automatically
(Recommended)
automatically from DHCP server of AHT-
E300, check on this radio button.
Specify an IP address
If you want to use an assigned (static) IP
address, and set the IP Address as 10.0.0.1,
Subnet Mask as 255.255.255.0 and Gateway
10.0.0.2.
Notice: When you want to use static IP address, you should set the IP
address as the same subnet with AHT-E300 ADSL Router.
Step 6
Step 7
Click [OK] button. Windows may ask for original Windows installation
disk. Insert the installation disk if needed.
Windows will ask you to restart the PC. Click [Yes] button.
The TCP/IP settings of PC have been completed.
8
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Chapter
3
Web-based Management
This chapter explains how to manage the AHT-E300
ADSL Router.
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Notice: You must set up AHT-E300 ADSL Router via LAN. Make sure that the PC is
connected to AHT-E300 ADSL Router.
Start-up with Web-based Management
1.
Open your Web Browser on your PC that is connected to AHT-E300 ADSL
Router..
Notice: Internet Explorer 4.0 or higher version is recommended
Type “http://10.0.0.2” in the browser’s Address box and Press Enter. This
address is the default LAN IP address of AHT-E300 ADSL Router.
A user name and password prompt will appear. Type User Name as admin
and password as conexant.
Notice: You can change the password later.
Notice: If the user name and password prompt appears again, it
means unauthorized user. Please check Caps Lock key. AHT-E300
ADSL Router distinguishes the uppercase and lowercase letters (in
the password).
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2.
Click [OK] button. Then the brief information page (default page) will
appear. In this page, you can check the firmware version (in this example,
021302_RELB_S), WAN IP addresses and LAN IP address.
Notice: The AHT-E300 ADSL Router has DHCP server inside, so you can
see the IP addresses that is assigned from that DHCP server, if you enable
the DHCP server function and obtain IP address automatically.
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3.
Click [ADSL] link. Then the ADSL Status page will appear. In this page, you
can check ADSL link status.
ADSL Line State
The status of the line synchronization
ADSL Startup Attempts How many times the modem try to sync.
Elapsed Time
SNR Margin
Line Attenuation
Errored Seconds
Loss of Signal
Loss of Frame
CRC Errors
Data Rate
How long the modem operates.
Attained Signal to Noise Margin
Attenuation from the DSLAM
How long the modem drop the sync
How many times the modem drop the sync
How many frames the modem drops
CRC errors during the sync
Set by the DSLAM
Latency
Set by the DSLAM
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4.
Click [LAN] link. Then the LAN Status page will appear. In this page, you
can check LAN status.
LAN
IP Address
IP address of the modem
Subnet mask of the modem
MAC address of the modem
Subnet Mask
MAC Address
IPAddress that is assigned from the DHCP server in the modem
IP Address
IP address of the PC that is connect to the modem
MAC address of the PC that is connect to the modem
MAC Address
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5.
Click [WAN] link. Then the LAN Status page will appear. In this page, you
can check LAN status.
Default Gateway
Per VC Settings
Enabled?
For bridge operation, it doesn’t work.
It enables or disables the VC (Virtual Channel).
VPI Number that is used in the network.
VCI Number that is used in the network.
Virtual IP address that is identified by the VC.
Subnet mask that is identified by the VC
VPI?
VCI?
Static IP Address
Subnet Mask
ATM
Service Category
Bandwidth
You can select UBR or CBR by the service.
Select 0, if you want automatic operation.
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Encapsulation
Bridge
You can select several encapsulation methods. The
AHT-E300 ADSL Router can support various
encapsulation methods. But to be sure, contact
your service provider.
For RFC1483 Bridged IP LLC encapsulation,
Bridge must be enabled.
IGMP
Internet Group Management Protocol.
PPP
Service Name
For some PPPoE connection, service name may be
required.
User Name
For PPP operation, type your username that is
given by your service provider.
Password
For PPP operation, type your password that is
given by your service provider.
Disconnect Timeout
When there’s no traffic, AHT-E300 router can
disconnect the ADSL connection. If you type ‘0’,
it will not disconnect the connection.
Authentication
PPP user authentication method. Choose Auto if
you want to negotiate with server automatically.
Automatic Reconnect In case of abnormal disconnecting from the server,
you can reconnect to the server automatically.
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DHCP
DHCP Client enable
To get an IP address from the network, you may
enable this. This feature depends on your service
provider.
Host Name
This option is not required for the normal
operation.
Virtual Channel
Execute/Reset
Select VC first that you want to configure.
If you finish configuring VC, you must click
[Execute].
Save Configuration
If you click [Execute], then you must save all
configurations to flash memory and reboot the
AHT-E300 ADSL Router.
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6.
Click Configuration - [LAN] link. Then the LAN Configuration page will
appear. In this page, you can configure LAN settings.
LAN configuration
IP Address
IP address of the modem
Subnet Mask
DHCP Server
Subnet mask of the modem
DHCP address pool
selection
Select User Defined if you want to allocate the IP
addresses that will be assigned to the PCs.
User Defined Start Address Start address of IP address pool
User Defined End Address
Lease Time
End address of IP address pool
Select 0 if you want to auto-management
Only single user mode is working in this version
Select Autosense if you want to auto-sensing.
User Mode
Ethernet Mode
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7.
Click Configuration - [NAT] link. Then the NAT Configuration page will
appear. In this page, you can configure NAT function.
NAT
NAT
Simply convert private IP address to public IP address
In addition to the NAT function, it can translate port information.
Disabling NAT function.
NAPT
Disable
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8.
Click Configuration - [Virtual Server] link. Then the Virtual Server
Configuration page will appear. In this page, you can configure the port
mapping information. If you use NAT function in the AHT-E300 ADSL
Router, every port will be blocked after NAT. So, if you want to use some
special application like on-line game or some other peer-to-peer software,
you must open the port to specific host PC. To use this function, host PC
must have static IP address, such as 10.0.0.10. To know the exact port
number that the software is using, contact the software maker.
9.
Click Configuration - [Bridge Filtering] link. Then the Bridge Filtering
configuration page will appear. In this page, you can configure bridge-
filtering function.
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10.
Click Configuration - [DNS Configuration] link. Then the DNS
Configuration page will appear. In this page, you can choose the default DNS
configuration. If you want to use static DNS server, type your DNS server in
the Preferred DNS server. Or if you want to use automatic discovered DNS
server, choose ‘Use Auto Discovered DNS Servers Only’.
11.
Click Admin Privilege - [WAN Status] link. In this page you can check the
WAN connection status.
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12.
Click Admin Privilege - [ATM Status] link. In this page you can check the
ATM connection status.
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13.
Click Admin Privilege - [PPP Status] link. In this page you can check the
PPP connection status.
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14.
Click Admin Privilege - [TCP Status] link. In this page you can check the
TCP connection status.
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15.
Click Admin Privilege - [Route Table] link. In this page you can check the
Route Table.
16.
Click Admin Privilege - [Learned MAC Table] link. Then the Bridge MAC
Table page will appear. In this page, you can check the expiration time of the
learned MAC table. In this example, every 100 seconds, AHT-E300 renew
the MAC table.
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17.
Click Admin Privilege - [ADSL Configuration] link. Then the ADSL
Configuration page will appear. In this page, you can change the ADSL
options.
Trellis
When you using G.DMT protocol, enabling trellis
option may get more data rate.
Handshake Protocol
Wiring Selection
You can select G.DMT or ANSI T1.413.
You must select Tip/Ring.
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18.
Click Admin Privilege - [RIP Configuration] link. Then the RIP
Configuration page will appear. In this page, you can enable the RIP (Routing
Information Protocol) function to communicate with other router.
19.
Click Admin Privilege - [Password Configuration] link. Then the password
Configuration page will appear. In this page, you can change the password of
the AHT-E300 ADSL Router. The default password is “conexant”.
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20.
Click Admin Privilege - [Misc. Configuration] link. Then the miscellaneous
Configuration page will appear. In this page, you can configure
miscellaneous functions.
WAN side HTTP
FTP server
DMZ
You can access this web-server.
You can access the FTP server inside the modem.
If this function is enabled. DMZ HOST IP can be
accessed through NAT directly without blocking.
DMZ HOST IP
IP address of the PC that is accessed directly
through the ADSL connection.
PPP reconnect on When there’s any WAN access from the client PC,
WAN access
AHT-E300 ADSL Router connects PPP
connection automatically.
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21.
Click Admin Privilege - [Diagnostic Test] link. In this page, you can test the
AHT-E300 ADSL Router.
Testing Ethernet LAN connection
Testing the LAN connection between
the Modem and the PC
Testing ADSL Synchronization
Testing ADSL link
Test ATM OAM Segment Loop Back
Testing OAM function
Test ATM OAM End-to-End Loop Testing OAM function
Back
Test Ethernet connect to ATM
Testing the connection between the
Ethernet layer and the ATM layer.
Test IP connect to Ethernet
Testing the connection between IP layer
and the Ethernet layer.
Notice: If some test has failed, you can click [HELP] link to check how to
avoid that situation.
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22.
Click Admin Privilege - [Code Image Update] link. In this page, you can
upload the updated firmware.
Notice: Code image update is used only for minor update.
23.
Click Configuration - [Save Settings] link. When every configuration is
finished, you must write setting to flash memory and reboot the modem to
take effect.
24.
Click Admin Privilege - [Reset to Factory Default] link. In this page you
can restore all the factory default settings.
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Appendix
I
Specifications
General
Model Name
AHT-E300
LAN Specification
IEEE 802.3, 802.1d
ANSI T1.413 Issue 2
ITU-T G.992.1 (G.DMT)
ITU-T G.992.2 (G.LITE)
ITU-T G.994.1 (G.HS)
WAN Specification
Input: 230VAC 50Hz
Output: 13.8VDC, 1A
Power Adaptor
Certification
FCC Part 15 Class B
EN 55022
Physical and Environment
Dimension (W * D * H)
70.9*140.5*110.3 (mm)
280g (Modem only)
Weight
Operating ambient temperature
Storage ambient temperature
Operating Humidity
0 ℃ ~ +40 ℃ with airflow
-10 ℃ ~ +85 ℃
10% to 90% non-condensing
5% to 95% non-condensing
Two RJ11 Jack (pins 3&4, tip and ring)
Up to 18,000ft (26AWG)
Non-operating storage humidity
Connector
Operating Distance
Notice: The specifications can be changed without a prior notice.
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AHT-E300 ADSL ROUTER
Appendix
Troubleshooting
II
Troubleshooting Flow Chart
If you have any trouble using AHT-E300 ADSL Router, Follow this Flow-Chart and go to
solutions as next page.
Start
Go to Solution 1
Go to Solution 2
Go to Solution 3
Go to Solution 4
Go to Solution 5
Power LED is ON?
LNK LED is ON?
LAN LED is ON?
Log into Web page?
PPP is working?
If you still have problems, go to other
trouble shooting guide page.
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Solution 1
Problem: Power LED is not flashing.
1. Check the power adaptor is correctly connected.
2. Check the power adaptor is 14VDC and 1.0A. If it is not, don’t connect that power
adaptor to the power jack in the modem and contact your local distributor to change the
power adaptor.
3. Touch the power adaptor just a moment. If the temperature is too high, disconnect the
power adaptor from the power source and contact your local distributor to change the
power adaptor.
Caution: The temperature of defective power adaptor may be too high, user must be
careful when disconnecting from the power source.
Solution 2
Problem: ADSL LNK LED is not flashing.
1. If LNK LED is not flashing or blinking, check the RJ-11 cable connection between
LINE port of the modem and ADSL port of the micro-filter.
2. If LNK LED is not flashing and blinking, it means that there’s no ADSL signal to the
AHT-E300 ADSL Router. In this case contact your service provider if there’s problem in
their service network or not.
3. If LNK LED is just blinking and not flashing, it means that there’s an ADSL signal. But
because there may be a lot of noise, AHT-E300 ADSL Router cannot connect to the
DSLAM (DSL Access Multiplexer) in the CO (Central Office). In this case contact to
your service provider if there’s problem in their service network or not.
4. If LNK LED is flashing just a while and blinking some while, it means that there’s some
noise fluctuation. When there’s low noise in the ADSL line, AHT-E300 ADSL Router
sync with DSLAM in the CO. But when some noise fluctuation has occurred, AHT-
E300 ADSL Router drops the synchronization with DSLAM to get enough noise
margins. In this case contact to your service provider if there’s problem in their service
network or not.
5. If LNK LED is just blinking, check that RJ-11 cable is connected to the PHONE port of
the modem or PHONE port of the micro-filter.
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Solution 3
Problem: LAN LED is not flashing.
1. Check the supplied RJ-45 straight through LAN cable is correctly connected.
2. If you want to connect the straight through LAN cable to HUB, connect to Uplink port
of the HUB.
3. If your HUB doesn’t have the Uplink port, use the RJ-45 cross-cable to any port of HUB.
Solution 4
Problem: Cannot log into the web page.
1. Check the IP configuration of the PC. The IP address of the PC must have same subnet as
AHT-E300 ADSL Router. For example, if you set the IP address of AHT-E300 ADSL
Router as 192.168.10.1 and disable the DHCP server, the IP address of the PC is
192.168.10.x (the range of x is from 2 to 255.), the subnet mask is 255.255.255.0 and the
2. If you enable the DHCP server, you can obtain IP address automatically and connect to
the gateway. The gateway IP address of the PC is the IP address of the AHT-E300 ADSL
Router.
3. If you forgot the IP address of the AHT-E300 ADSL Router, press the factory default
button and set the IP address of the PC as “obtain IP address automatically”. And you can
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Solution 5
Problem: PPP connection is not working.
Case 1. RFC1483 Bridge mode (3rd party PPPoE client software)
1. If LNK LED and LAN LED are flashing, there may be the PPPoE software problem in
your PC. Check the software is working properly.
2. Check that your ID and password for the PPP connection.
3. If someone is using your ID and password in other point, you may have trouble to
connect to the Internet.
4. Check that you’re using the supplied RJ-45 straight-through LAN cable.
5. Check the VPI/VCI number is correctly configured and bridge is enabled in the
[Configuration-WAN] page.
6. If the PPPoE connection is not still working, contact to your service provider whether
there’s problem in their service network or not.
Case 2. PPPoA and PPPoE (without 3rd party PPPoE client software)
1. Check that your PC can get the ping reply from AHT-E300 ADSL Router. For example,
c:\>ping 10.0.0.2. If you cannot get the ping reply form AHT-E300 ADSL Router,
press the factory default button to start from the factory default settings.
2. Check that your ID and password for the PPP connection.
3. If someone is using your ID and password in other point, you may have trouble to
connect to the Internet.
4. Check that you’re using the supplied RJ-45 straight-through LAN cable.
5. Check the VPI/VCI number is correctly configured and bridge is enabled in the
[Configuration-WAN] page.
6. Check that AHT-E300 ADSL Router got the PPP IP address from your service provider
at [Admin Privilege-Route Table]. If AHT-E300 ADSL Router doesn’t get the PPP IP
address, try to reboot AHT-E300 ADSL Router by turning off and on.
7. If the PPPoA/PPPoE connection is not still working, contact to your service provider
whether there’s problem in their service network or not.
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Other Troubles
Problem: PPP connection is not always on.
To save the IP addresses, your service provider may disconnect you when there’s no data
traffic for a while. If you want to be always on, enable the PPP reconnect on WAN access at
[Admin Priviledge-Misc Configuration]. With this option is enabled, AHT-E300 ADSL
Router connect to the PPP server automatically when there’s an internet access.
Problem: Download speed is not so fast.
ADSL connection is just from the DSLAM in the CO to your modem. Depending on your
service provider or service that you want to connect, download speed may vary.
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AHT-E300 ADSL ROUTER
Appendix
III
Glossary
10BaseT:
An Ethernet standard that uses twisted wire pairs.
100BaseTX:
IEEE physical layer specification for 100 Mbps over two pairs of Category 5 UTP
or STP wire.
CSMA/CD (Carrier Sense Multiple Access/Collision Detection):
The LAN access method used in Ethernet. When a device wants to gain access to
the network, it checks to see if the network is quiet (senses the carrier). If it is not, it
waits a random amount of time before retrying. If the network is quiet and two
devices access the line at exactly the same time, their signals collide. When the
collision is detected, they both back off and each waits a random amount of time
before retrying.
DHCP (Dynamic Host Configuration Protocol):
DHCP is protocol that enables network administrator to manage centrally and assign
IP address in system automatically. Using the TCP/IP, each station must have a
unique IP. DHCP server makes the IP address to be automatically assigned to the
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stations whose have the DHCP client function. With DHCP server, the IP address
need not be entered manually.
DNS (Domain Name System):
DNS is the way that Internet domain name are located and translated into IP address.
A domain name is a meaningful and easy-to-remember handle for an IP address.
Dynamic IPAddress:
An IP address that automatically assigned to a client station. Network devices that
serve multiple users are usually assigned static IP addresses.
IPAddress:
It is a 32-binary digit number that identifies each sender or receiver of information
that is sent in packet across the Internet.
IPCONFIG:
A Windows NT or 2000 utility that provides for querying, defining and managing IP
addresses within a network. A commonly used utility for configuring networks with
static IP addresses.
ISP (Internet Service Provider):
It is business that provides service to let users connect to the Internet.
MAC Address (Media Access Control Address):
It is a 64- binary digit number that set as unique hardware number for network
adapter.
PPPoE (Point to Point Protocol over Ethernet):
It is a method used mostly by DSL provider for connecting personal computers to a
broadband modem for Internet access. It is similar to how a dial-up connection
works but at higher speeds and quicker access.
PPTP (Point to Point Tunneling Protocol):
It is protocol that allows corporations to extend their own corporate network through
private “tunnels” over the public Internet. Effectively, a corporation uses a wide-
area network as a single large local area network.
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Static IPAddress:
It is a permanent IP address that is assigned to a node in a TCP/IP network.
TCP/IP (Transmission Control Protocol/Internet Protocol) :
It is the basic communication language or protocol of the Internet. It can also be
used as a communication protocol in a private network. When you are set up with
direct access to the Internet, your PC is provided with a copy of the TCP/IP program
just as every other PC that you may send message to or get information from also
has a copy of TCP/IP.
Cautions
Cautions during installation
Use with proper voltage.
The product can be damaged or be in risk of fire.
Do not disassemble, repair or remodel the product.
The product may be damaged.
Avoid dust and humidity.
The product may operate less effectively or be in danger of electric shock.
The power outlet must have a grounding terminal.
It prevents electric shock when electric leakage occurs.
Do not connect other products with high power consumption with a multi-tap.
It may cause danger of fire due to overheating.
Do not let children touch a desiccant.
Children may try to eat, and it is very dangerous.
Cautions during use
Change any damaged power cord and power adapter.
They may cause risk of electric shock and fire.
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AHT-E300 ADSL ROUTER
Keep the product, power cable and AC adapter far from heating appliances.
They can be a source of fire or can cause deformation of the product.
Do not touch the power cord with wet hand.
It may cause risk of electric shock and fire.
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If you find errors or omissions in this manuscript, or if you can suggest ways
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