MAYAH C11 Series User manual

© 2010 MAYAH Communications
Manual for C11

MAYAH, C11, FLASHCAST are registered Trademarks. All other trademarks are acknowledged with this.
C11 User Manual; Order-No. C11-UM001
Revision 02/2010
© 2010 MAYAH Communications
For copying this manual, even by extract, an explicit written permission of Mayah Communication GmbH is required.

3Contents
© 2010 MAYAH Communications
List of Contents
Part I Introduction 6
...................................................................................................................................61What is C11 Codec Series
...................................................................................................................................82Scope of Delivery
...................................................................................................................................83Useful Accessories
Part II First Start 10
...................................................................................................................................101Before Start
...................................................................................................................................102Connectors
...................................................................................................................................133LEDs ...................................................................................................................................144Buttons
...................................................................................................................................155Graphic User Interface
...................................................................................................................................166Switching On and Off
...................................................................................................................................167Useful Hints
......................................................................................................................................................... 16
Default IP settings
......................................................................................................................................................... 18
How to access C11 via FTP
......................................................................................................................................................... 18
How to start Web Remote
......................................................................................................................................................... 18
How to update C11 firmware
......................................................................................................................................................... 19
How to activate Keycodes
......................................................................................................................................................... 20
How to reset C11
......................................................................................................................................................... 20
Boot Script
Part III Front panel user interface 22
...................................................................................................................................221Monitor ......................................................................................................................................................... 24
Headphones
......................................................................................................................................................... 24
Mixer .................................................................................................................................................. 25
Structure of dialog and navigation
.................................................................................................................................................. 25
Mixer profiles
........................................................................................................................................... 26
User profiles
........................................................................................................................................... 26
Factory profiles
........................................................................................................................................... 27
Skin profiles
.................................................................................................................................................. 27
Gain .................................................................................................................................................. 28
Mixer matrix
......................................................................................................................................................... 29
Setup .................................................................................................................................................. 29
Audio In
.................................................................................................................................................. 32
Mix Mode
.................................................................................................................................................. 33
AES
...................................................................................................................................342Codec/Transmission
......................................................................................................................................................... 34
Connect menu
.................................................................................................................................................. 35
Last connections
.................................................................................................................................................. 35
Phone book menu
.................................................................................................................................................. 36
Direct Dial menu
......................................................................................................................................................... 39
Status menu
.................................................................................................................................................. 39
Interface status
.................................................................................................................................................. 42
Coding

Manual for C114
© 2010 MAYAH Communications
......................................................................................................................................................... 42
Setup menu
.................................................................................................................................................. 42
Interface menu
........................................................................................................................................... 43
Ethernet
........................................................................................................................................... 45
ISDN ........................................................................................................................................... 49
POTS (PSTN)
........................................................................................................................................... 50
3G/UMTS
.................................................................................................................................................. 52
Quality
.................................................................................................................................................. 56
Enhanced Applications
........................................................................................................................................... 56
Intercom
........................................................................................................................................... 56
Dual Mode
........................................................................................................................................... 57
Redundancy
...................................................................................................................................593Record/Playback
......................................................................................................................................................... 60
Play menu
.................................................................................................................................................. 61
Upload
.................................................................................................................................................. 62
Tracks
......................................................................................................................................................... 63
Record menu
.................................................................................................................................................. 63
Setup ........................................................................................................................................... 64
Quality
........................................................................................................................................... 65
Storage
......................................................................................................................................................... 66
Card menu
...................................................................................................................................674System ......................................................................................................................................................... 67
Configurations
......................................................................................................................................................... 68
Miscellaneous
.................................................................................................................................................. 68
Device ID
.................................................................................................................................................. 68
Date & Time
.................................................................................................................................................. 69
LCD Display
.................................................................................................................................................. 69
System health
.................................................................................................................................................. 69
Versions
.................................................................................................................................................. 69
Connections
.................................................................................................................................................. 70
User Interface
.................................................................................................................................................. 70
Display option
.................................................................................................................................................. 70
Factory Default
.................................................................................................................................................. 70
Timeouts
.................................................................................................................................................. 71
AJC .................................................................................................................................................. 72
Export Configuration
.................................................................................................................................................. 72
Import Configuration
.................................................................................................................................................. 72
Ancillary Data
......................................................................................................................................................... 73
Switch off
Part IV How to use for 76
...................................................................................................................................761Recording during transmission
...................................................................................................................................772Playback during transmission
Part V Technical specifications 80
...................................................................................................................................801Models
...................................................................................................................................812General Technical Data
Index 83

Part I
Introduction

Introduction >
6
© 2010 MAYAH Communications
Manual for C11
1Introduction
1.1 What is C11 Codec Series
C11 Codec Series comprises the following general features:
·Transmission over variety of network interfaces
·Mixer (enhanced mixer functionality depending on model)
·Recording (depending on model)
·Playback of files (depending on model)
·Recording during Transmission (depending on model)
·Playback during Transmission (depending on model)
·FTP support for transmission of audio files (depending on model)
·E-mail support for transmission of audio files (depending on model, upcoming
feature)
·FTP support for configuration export/import operations
·Dual Mode over ISDN (depending on model)
·Intercom functionality by Audio-over-IP
·Gateway functionality (upcoming feature)
·Backup functionality (upcoming feature)
·Web Remote
Generally it can be distinguished between two kinds of C11 models:
'standard models' C1130/31/35, C1140/41, C1180/81
'advanced models' C1150/51/55, C1160/61, C1190/91
The advanced models have got the following additional features:
·Slots for optional transmission interfaces (3G, POTS)
·Slots for storage media (e.g. SD Card)
·Recording & playback
·Switchable Mic/Line Inputs
C11 has an easy to use and intuitive User Interface developed in co-operation
with some of our key customers. However, suggestions for possible
improvements are highly appreciated. For this and any other questions referring
C11 please contact [email protected].
a) Transmission
C11 is based on the core technology of one of the most powerful professional
audio codec CENTAURI II. Live audio or recorded audio can be transmitted and
received via the following interfaces:
·Ethernet (IP transmission)
·ISDN
·POTS (optional; IP transmission; see chapter Useful Accessories)
·3G/UMTS (optional; IP transmission; see chapter Useful Accessories)
·WLAN (optional; IP transmission; see chapter Useful Accessories)
b) Professional audio interfaces

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Manual for C11
C11 provides:
·AES/EBU audio input/output & sync
·Line inputs/outputs with 24 bit DA/AD converters
·Switchable limiter
·Switching between line and microphone input (advanced models only)
·Switchable high pass filter (advanced models only)
·Switchable attenuation of -20 dB (advanced models only)
·Switchable phantom power of 48 Volts for condenser microphones (advanced
models only)
c) Recorder (depending on model)
C11 can record audio on the following media:
·Standard SD-card (see also chapter Introduction/Useful Accessories)
·Standard USB stick (see also chapter Introduction/Useful Accessories)
The audio signal can be recorded from the audio inputs and/or decoder output.
The recorded audio can be saved in following formats
·MPEG Layer 2; file format Digas Musifile; file name extension .msf
·MPEG Layer 3; file format BWF; file name extension .mp3
·Linear audio (PCM); file format: BWF; file name extension .wav
·AAC; file format RAW; file name extension .aac
·AAC (HE); file format RAW; file name extension .aac
d) Player (depending on model)
C11 can play back and hence transmit the recorded files. The audio can be
monitored via the headphones and the line output (see also chapter First Start/
Connectors).
e) Recording during Transmission (depending on model)
C11 can also record the transmitted audio in linear format. This enables you to
protocol all your transmissions.
f) Playing during Transmission (depending on model)
C11 enables to listen to an audio file while another audio is transmitted. So you
can add pre-recorded material to a live audio feed.
g) Intercom
In Intercom mode besides the main connection a 'command connection' (e.g. to
call for technician) can be established additionally.
g) Gateway (upcoming feature)
Gateway mode enables the re-routing of audio received at one connection to the
other, e.g. ISDN to IP.
h) Backup (upcoming feature)
Backup mode enables the failover functionality, i.e. if one connection fails C11
automatically switches to another connection, e.g. IP to ISDN.
i) Dual Mode (depending on model)
With C114x and C116x Dual Mode enables establishing of two independent
ISDN mono connections.
h) Web Remote
C11 can be configured and administrated by an integrated web interface. See
also chapter First Start/Useful Hints/How to start Web Remote. The functionality
of this web interface is described in an additional manual. However, usually this
manual is not needed since the web remote interface is self-explanatory.

Introduction > Scope of Delivery
8
© 2010 MAYAH Communications
Manual for C11
1.2 Scope of Delivery
·C11
·This manual (order no. C11-UM001)
·C11 AC/DC power supply (order no. C11PSU)
International AC/DC PSU (100-240 VAC, 50 - 60 Hz)
·Basic 19" rack mount accessories
·Other standard accessories (see packing list)
1.3 Useful Accessories
Original MAYAH C11 accessories
·C11 3G/UMTS card (order no. C11-3G)
·C11 WLAN card (future option; not available yet)
·C11 POTS card (order no. C11POTS)
·C11 AES/EBU DE9 to 3x XLR adapter (Order no C11C20)
·C11 USB RS232 adapter (Order no. C11C21) for ancillary data transport or
remote control via terminal emulation (see also Chapter System/
Miscellaneous/Ancillary Data)
Special MAYAH C11 rack mount accessories
·Mechanical Kit to mount two ½ 19” C11xx units side by side in a 19” rack
(order no. C11KIT)
·C11 RPSU - Redundant Power Supply for up to 8 C11 units (order no.
C11RPSU)
Other C11 accessories
·SD/SDHC card (for recording; depending on model)
·PCMCIA memory card (for recording; depending on model)
·PCMCIA adapter for CF memory card (for recording; depending on model)
·USB stick or other USB-based storage device (for recording; depending on
model)
Note:
·If you want to use C11 for mobile transmission you need an 3G/UMTS or a
WLAN card.
·If you want to use C11 for recording you need either an SD/SDHC card, a PC
memory card (e.g. Compact Flash card with PC Card adapter) or a USB
storage device.

Part II
First Start

First Start >
10
© 2010 MAYAH Communications
Manual for C11
2 First Start
2.1 Before Start
·Check if scope of delivery (see chapter Scope of Delivery) is complete with
help of the included packing list
·For later recording/playback insert either an SD/SDHC card or a USB stick or
PC memory card (only advanced models)
·For later mobile transmission insert either the original C11 3G/UMTS card or
the original C11 WLAN card (only advanced models)
·For later POTS-transmission insert the original C11 POTS card (only
advanced models)
Installation in rack
When installing the C11 in a rack or another assembly you should
make sure that the housing has the necessary air exchange and if
one C11 mounted on top of the other you should have a cooling
system that produces an air current to prevent heat accumulation.
Environment and Operating Conditions
Do not subject the device to damp (e.g. proximity to humidifiers etc.),
heat (e.g. proximity to radiators, direct sunlight) or mechanical stress
(e.g. shaking)! Make sure that the ventilation openings of the device
are not obstructed when the device is in operation!
2.2 Connectors
Connectors on the front panel
Headphones: 1/4" (6.3 mm) stereo phone jack (TRS)
Connectors on the rear panel

First Start > Connectors 11
© 2010 MAYAH Communications
Manual for C11
a) Audio connectors
·Analog input, 2 balanced XLR (C1130/31, C1140/41, C1150/51, C1160/61,
C1180/81, C1190/91)
Note:
For C1150/51, C1160/61, C1180/81, C1190/91 these inputs can be switched
to Microphone inputs, also with 48V phantom power if required. (See also
Chapter Monitor/Setup/Audio In)
·Analog output, 2 balanced XLR
·AES/EBU In/Out/Sync In, DE9 (9 pin Sub-D) female
(see chapter Useful Accessories for Adapter Order No. or consult the
technical manuals at www.mayah.com/support/support-downloads.php for pin
layout).
b) Communication interfaces
·Ethernet port (10/100 LAN)
This interface is available in all C11 models and can be used for both audio
transmission and control
·Optional communication interfaces (depending on model)
2nd Ethernet (10/100 LAN) (C1190/91)
This interface can be used for main or redundant audio streaming.

First Start > Connectors
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© 2010 MAYAH Communications
Manual for C11
ISDN (C1140/41, C1160/61)
4x S0BRIs
2x ASI outs (C1180/81)
c) Slots (advanced models only)
Advanced models have got two slots.
PC card slot
In this slot the following optional cards can be inserted:
·C11 3G/UMTS card for IP-transmission via 3G/UMTS
·C11 WLAN card for IP-transmission via WLAN
·C11 POTS card for transmission via analog telephone lines
·PC Memory card (e.g. Compact Flash card with PC card adapter for recording
or config. backup)
SD card slot
- for recording (recommended) or configuration backup
d) USB ports
C11 has got two USB ports.
USB A-type port
Here a USB storage device (e.g. USB stick) can be connected. It be used as
storage for recording (only advanced models), as well as for emergency reset or
re-configuration using a Boot Script (see Useful Hints/Boot Script) or as a
recommended device for configuration backup (see also chapter System/
Miscellaneous/Export Config).
USB mini port
This USB mini port is planned for future use.

First Start > Connectors 13
© 2010 MAYAH Communications
Manual for C11
e) GPIO (Opto In/Relay Out)
This general purpose interface at 15 pin D-Sub (DE15) female connector
supports 4x Opto In/ 4x Relay Out and can be used e.g. for far-end switching
functionality. GPIO interface is also required for remote control/monitoring of the
MAYAH Redundant Power Supply C11 RPSU. Consult the technical manuals at
www.mayah.com/support/support-downloads.php or contact MAYAH
communications for pin layout.
f) Power supply connector
Special Hirose HR10 port for C11 AC/DC power supply or MAYAH RPSU12. Use
only an original MAYAH C11 power supply. MAYAH is not liable for damages
caused by none-MAYAH equipment.
2.3 LEDs
LEDs: all models except C1135, C1155 LEDs: C1135, C1155
Level LEDs
Scale between 0 dBFs and -42 dBFs
a) Audio In (all models except C1135, C1155)
b) Audio Out (all models)
Status LEDs
a) Power
b) Framed
Valid audio data is received and being decoded.
c) Connect
At all communications interfaces except ISDN this means 'audio data is being
sent out'.
At ISDN this means 'ISDN connection is established'.

First Start > LEDs
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© 2010 MAYAH Communications
Manual for C11
d) Alarm
Alarm lights up if one of System Health parameters is out of tolerance range.
Following parameters are being checked:
·Voltages
·Temperatures
2.4 Buttons
Only following models have got display and buttons on the front panel:
·C1131, C1141, C1151, C1161, C1181, C1191
Generally the buttons can be divided in three groups:
·Function buttons (F1-F4)
·Cursor buttons/OK button
·Alphanumeric keypad
a) Function buttons
The buttons F1 - F4 have got a context sensitive meaning i.e. in different
situations different functionalities are assigned. Which functionality is currently
assigned is displayed on the LCD display.
Usually the buttons F1 - F3 are used to enter the referring sub menu items.
The button F4 has got only 3 functions:
·Press F4 for approximately 2 seconds to switch on C11 or to enter the switch
off dialog.
·In the main screen press F4 to enter System menu
·In any other screen press F4 to escape to upper level in menu structure or to
close current dialog
b) Cursor buttons/OK button

First Start > Buttons 15
© 2010 MAYAH Communications
Manual for C11
The cursor buttons enable all navigations through the menus.
With the OK button the user steps in entry fields (e.g to type in an IP address)
and confirms the complete entry.
Backspace functionality (delete character/text )
Holding the |button pressed for approx. 2 seconds changes to
delete mode. First character is deleted after approx. 0.5 seconds but
the delete speed is increased by 10% for each further character.
c) Alphanumeric keypad
With the numeric keypad you can enter names, phone numbers or IP addresses.
The input is similar to mobile phones. Just press a key until the needed character
is shown:
Assigned key 1: 1 . : /
Assigned key 2: 2 A a B b C c
Assigned key 3: 3 D d E e F f
Assigned key 4: 4 G g H h I i
Assigned key 5: 5 J j K k L l
Assigned key 6: 6 M m N n O o
Assigned key 7: 7 P p Q q R r S s
Assigned key 8: 8 T t U u V v
Assigned key 9: 9 W w X x Y y Z z
Assigned key 0: 0 <SPACE>
Assigned key *: * + -_
Assigned key #: # @
Note:
Which characters really can be entered depends on the menu item (context
sensitive).
2.5 Graphic User Interface
a) Menu area (right side of the screen)
In the menu area the meaning of the context sensitive function buttons is
displayed.
Note:
Usually the F4 button is used as an 'ESC' button except:
·at start screen the F4 button will open System menu
·holding the F4 button for approx. 2 seconds will open 'Switch Off' dialog
b) ESC
'ESC' means to step back to the next upper level of the menu structure or to
close current dialog.
c) Scrollbars
The scroll bar on right side indicates the position in the referring list. An empty
scroll bar means that the whole list is shown on the screen. Scrolling is done by
pressing and holding cursor buttons ~and €.

First Start > Graphic User Interface
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© 2010 MAYAH Communications
Manual for C11
d) Navigation within screens
Elements inside of the screen can be reached by pressing the cursor buttons.
Direction of the cursor buttons corresponds to the navigation direction on screen.
e) Backspace functionality (delete character/text )
Holding the |button pressed for approx. 2 seconds changes to delete mode.
First character is deleted after approx. 0.5 seconds but the delete speed is
increased for 10% for each further character.
2.6 Switching On and Off
The models without front panel controls are switched on
automatically as soon as power supply is available.
For models with front panel controls:
a) Soft switching on/off
Press and hold the F4 button for approx. 2 seconds to switch on C11.
To prevent accidental switch off this must be done either
·via front panel menu item System/Switch off
·or by holding the F4 button for approx. 2 seconds to open the 'Switch Off'
dialog
b) Hard switching on/off
Usually this means connecting or removing power supply e.g. plug or unplug
power supply connector. However, hard switching off can be also done by holding
the following key combinations for approx. 4 seconds: cursor button €and '0'.
Note:
C11 'remembers' the last power state i.e. if C11 has been turned off by removing
power supply it starts up automatically as soon as power supply is back.
2.7 Useful Hints
2.7.1 Default IP settings
a) By default every C11 has got the following IP settings:
·DHCP: off
·Address: 10.0.0.10
·Netmask: 255.255.255.0
·Gateway: 255.255.255.255
·DNS Server: 255.255.255.255
Advanced Dual IP Audio Codec C1190/901 has got two Ethernet cards with
different default settings.
·LAN1 (the upper one, by default only used for audio streaming)

First Start > Useful Hints 17
© 2010 MAYAH Communications
Manual for C11
- DHCP: off
- Address: 10.0.1.10
- Netmask: 255.255.255.0
- Gateway: 255.255.255.255
- DNS Server: 255.255.255.255
·LAN (the bottom one, by default only used for remote control)
- DHCP: off
- Address: 10.0.0.10
- Netmask: 255.255.255.0
- Gateway: 255.255.255.255
- DNS Server: 255.255.255.255
Note:
If IP-address 255.255.255.255 is entered, it means that the service or address is
not in use.
Note 2:
If you want to control your C11 in your LAN it must be located in the same subnet
as your PC i.e. when the digits of your binary net mask are '1' the referring digits
of the IP address of your C11 and your PC must be the same.
Example:
Net mask: 255.255.255.0 = 11111111 11111111 11111111 00000000
PC IP address: 192.168.1.56
C11 with IP address: 192.168.1.57 is located in the same subnet, but
192.168.100.57 is not.
b) Default IP ports
Necessary IP ports for successful Audio-over-IP connections:
·5004 (Audio transmission, RTP)
·5005 (Network information, RTCP)
·5060 (SIP)
Some other IP ports used by MAYAH devices:
·20 and 21 (FTP Data and control)
·23 (Telnet remote control)
·80 (HTTP for web-remote)
·123 (NTP)
·161 (SNMP control)
·162 (SNMP traps)
·5006 (FEC Redundant Data, columns)
·5008 (FEC Redundant Data, rows)
·2060 (Audio level information for remote control software)
·2061 (UDP scan)
Full list of the IP ports can be found in the Communication Reference Manual at
www.mayah.com

First Start > Useful Hints
18
© 2010 MAYAH Communications
Manual for C11
2.7.2 How to access C11 via FTP
Each MAYAH unit provides an integrated FTP and Web server, so you can
access them as soon as the device is reachable via IP and the IP address is
known.
FTP access should be performed only by an experienced user
a) Access C11 system files
FTP access data for C11 are by default:
·Host: <IP addres of C11>
·Username: Admin
·Password: Power
b) Access storage devices attached to C11
To access SD Card or USB stick inserted into C11 just add an appropriate 'path'
to the access data:
·D: (SD Card); E: (PC card); F: (USB storage)
2.7.3 How to start Web Remote
To use the Web Remote Java 6 support is required and Java 6 applets must be
available within the web-browser. The Web Remote access data are by default:
·Host: <IP address of C11>
·Username: WebAdmin
·Password: WebPower
Additional password protection is used for the Web Remote area 'SPECIAL'
where experienced user can Update the C11, activate optional algorithms,
change various access passwords etc.
The password for 'SPECIAL' area is by default:
·'a' (single character)
2.7.4 How to update C11 firmware
In some cases it can be necessary to update your C11. It can be done using the
Web Remote Interface or directly using FTP. The update process should not be
interrupted, otherwise the unit can be damaged.
The firmware update is provided by MAYAH as a single file with the file name
extension '.upd'. This file must be get ready on your computer before update.
a) Update with the Web Remote Interface
·Start Web Remote Interface in a browser
·Go to the 'SPECIAL' button

First Start > Useful Hints 19
© 2010 MAYAH Communications
Manual for C11
·Choose Update and load the file
·C11 will reboot itself upon completion of upload and update itself
automatically.
·To continue device control with the Web Remote the browser tab or window
must be restarted as well
b) Update by using FTP
·With a standard FTP client software access C11 using the credentials given in
the chapter 'How to access C11 via FTP
·Put the '.upd' File to the root directory of the unit ('/user/'), ensure that the file
has been transferred entirely and restart (switch off and on) the C11.
Update process description / Precautions during update
1. Upload. It takes about 4 minutes to upload the '.upd' file to C11.
After this a reboot is required. If you are using the Web Remote,
reboot command will be issued automatically.
2. Installation. The new firmware is installed automatically. The
progress is shown by the text messages at the LCD screen and/
or blinking of LEDs. After this step is completed successfully
another reboot will occur automatically.
3. First start of the new firmware. At this point some further
update processes might occur without notice. These processes
must not be interrupted. On C11 models without LCD screen
please allow at least 1 minute of normal operation (green LED is
on and not blinking) after the update. DO NOT SWITCH THE
C11 OFF.
4. Update finished. To make sure that all update processes are
completed on C11 without LCD screen, please ensure that the
unit is reachable via network. On units with LCD screen it is
enough to wait until the Start Screen is displayed.
2.7.5 How to activate Keycodes
Keycodes are used to activate optional algorithms (see also Codec/Setup/Quality
) and functions of C11. Keycodes are provided by MAYAH Communications.
Keycodes can be set for each particular device by using Web-Remote (menu
item SPECIAL/Keycodes).
Alternatively keycodes can be entered with the direct command 'sys_keycode
<keycode>' by using Telnet session, boot script (see below) or any other control
type.

First Start > Useful Hints
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© 2010 MAYAH Communications
Manual for C11
2.7.6 How to reset C11
This operation should only be done by expert users. MAYAH is not
responsible for any possible risks or configuration losses in case of
misuse of this function.
Upon factory reset the entire configuration of the device will be set
back to the factory default values. Codec quality profiles, phone book
entries and all presets created by device users will be deleted!
There are three ways to bring the C11 back to the factory defaults
a) For C11 models with the front panel controls it is possible to do in the menu
SYSTEM/MISC/Factory Default.
b) For all models it is possible to do by establishing a telnet session to the C11 or
by using a telnet console in the SPECIAL area of the integrated web-remote and
typing the direct command 'sys_reset factory'.
c) For all models it is possible to include the direct command 'sys_reset factory' in
the Boot Script file and apply the boot script as described in the next chapter of
this manual.
2.7.7 Boot Script
This feature should only be used by expert users for emergency
situations e.g. helpful emergency USB stick created by service staff
to support non technical colleagues.
This configuration method can be particularly useful for all C11 models without
front panel controls in case that access data have been lost or device has
become unreachable via IP.
A file named 'mayah-command-scripts.txt' can be used as a boot script if it is
located in the root folder of a USB stick. A boot script can contain a set of any
direct commands (one command per line). Such direct commands are described
in the Communication Reference Manual. Please contact MAYAH for more
information on this.
Just insert the USB stick and start device. All the direct commands will be
executed after booting.
Example mayah-command-scripts.txt
ip_address 192.168.1.57
ip_netmask 255.255.255.0
Description: This simple boot script sets the IP address of C11 to '192.168.1.57'
and the net mask to '255.255.255.0'.