SystemBase C300xr User manual

SystemBase
C300xr
ISDN Audio Codec
User Guide
27 April 1998
Revision 9

Systembase C300xr 0018-013-009 Page 2 of 28
Contents
1. Introduction _________________________________________________________ 4
2. Front and Rear Panel Profiles __________________________________________ 5
3. Controls and Indicators________________________________________________ 6
3.1 VFD Display _______________________________________________________ 6
3.2 VU Meters _________________________________________________________ 6
3.3 VU Button _________________________________________________________ 6
3.4 Menu Buttons _______________________________________________________ 6
3.5 DIAL Button _______________________________________________________ 7
3.6 HANG Button ______________________________________________________ 8
3.7 Numerical 0 - 9 Buttons _______________________________________________ 8
4. Menu System_________________________________________________________ 9
4.1 Unit Description ____________________________________________________ 10
4.2 Status ____________________________________________________________ 10
4.3 Select Patch _______________________________________________________ 10
4.4 Modify Patch ______________________________________________________ 11
4.4.1 Patch Name ___________________________________________________ 11
4.4.2 ISDN Options__________________________________________________ 11
4.4.2.1 ISDN Audio _________________________________________________ 11
4.4.2.2 Channel 1 Options / Channel 2 Options____________________________ 12
4.4.2.2.1 ISDN Destination Number____________________________________ 12
4.4.2.2.2 ISDN Destination Sub-Address ________________________________ 12
4.4.2.2.3 ISDN Local Number ________________________________________ 12
4.4.2.2.4 ISDN Local Sub-Address_____________________________________ 13
4.4.2.2.5 ISDN Channel Mapping______________________________________ 13
4.4.2.2.6 ISDN Caller Line Identification (CLI)___________________________ 14
4.4.2.3 ISDN Data Rate ______________________________________________ 14
4.4.2.4 ISDN Auxiliary Data Port ______________________________________ 14
4.4.2.5 Auto Hunt (Detect Incoming Audio Mode) _________________________ 15
4.4.2.6 Silence Timeout (Dial on Audio)_________________________________ 15
4.4.3 X.21 Options __________________________________________________ 16
4.4.3.1 X.21 Audio__________________________________________________ 16
4.4.3.2 X.21 Auxiliary Data Port _______________________________________ 16
4.4.3.3 X.21 Control Line ____________________________________________ 16
4.4.4 Backup Options ________________________________________________ 17
4.4.4.1 Backup Monitor ______________________________________________ 17
4.4.4.2 Restore Monitor ______________________________________________ 17
4.4.5 Codec Function ________________________________________________ 18
4.4.6 Alarm ________________________________________________________ 19
4.5 Loopback _________________________________________________________ 19
4.6 ISDN Country Options_______________________________________________ 20
4.6.1 ISDN Country _________________________________________________ 20
4.6.2 ISDN SPID 1 / 2 (USA Only) _____________________________________ 20
4.6.3 ISDN Local Number 1 / 2 (USA Only) ______________________________ 21
4.6.4 Number Prefix (For Access Dialling Codes) __________________________ 21
4.7 Password Protection _________________________________________________ 21
4.8 Set Defaults _______________________________________________________ 22
4.9 Last Caller Identification _____________________________________________ 22
4.10 Screen Saver_______________________________________________________ 22

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5. Audio Connection____________________________________________________ 23
6. Network Interfaces___________________________________________________ 23
7. Data / Alarm / Remote Trigger Port ____________________________________ 24
7.1 Data Port__________________________________________________________ 24
7.2 Alarm Port ________________________________________________________ 25
7.3 Remote Trigger Port_________________________________________________ 25
8. Remote Management Ports ____________________________________________ 25
9. Physical Properties___________________________________________________ 28
10. Power Requirements _________________________________________________ 28
11. Calibration Information ______________________________________________ 28
Systembase Limited, PO Box 3572, Warminster, Wiltshire, BA12 6XQ, UK
Tel: [phone], Fax: [phone]
Website: www.systembase.com, E-Mail: [email protected]

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1. Introduction
The C300xr ISDN audio codec has been designed for the broadcast of high quality audio over
the ISDN and other digital networks, such as Switch-56, dedicated digital lines, optical fibre
networks, digital microwave links, satellite links, etc. To achieve an efficient utilisation of the
available network bandwidth, the C300xr uses apt-XTM100 audio compression/decompression
system to provide full duplex point-to-point communication.
Key Features
•Integral ISDN Terminal Adapter (64Kbps / 56Kbps)
•15KHz Mono Audio Over 2 x 64Kbps ISDN B Channels
•7.5KHz Stereo Audio Over 2 x 64Kbps ISDN B Channels
•7.5KHz Mono Audio Over 64Kbps ISDN B Channel
•2 x 3.7KHz Mono Audio Over 64Kbps ISDN B Channel
•2.4Kbps RS232 Asynchronous Data Transmission
•15.2KHz Stereo Audio Over 256Kbps Via X.21
•15.2KHz Mono Audio Over 128Kbps Via X.21
•Full Duplex Operation
•3.8ms Typical Coding Delay
•19" 1U Rackmount Enclosure
•VFD Display & Keypad
•20 Configuration Memories
•10 International Variants of ISDN
•Auto-ranging Power Supply
•> 80dB Dynamic Range
•Auto Hunt Mode Detection
•Dial On Audio Operation
•Studio-to-Transmitter (STL) with Automatic ISDN Backup
•Remote Management Ports

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2. Front and Rear Panel Profiles

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3. Controls and Indicators
3.1 VFD Display
A 20 character by 2 line VFD (Vacuum Fluorescent Display), provides comprehensive
information on the configuration of the unit and current status.
3.2 VU Meters
20 bit Digital VU Meters for monitoring Left and Right audio channels with Peak Hold. The
Meter range is -54dB to 0dB.
3.3 VU Button
Allows the user to monitor either the Input or Output audio via the Digital VU Meters. This
button operates by toggling between the Input and Output audio signals. Each time it is
depressed, it will cause the VFD Display to flash the current selection for 2 seconds.
Please note that if the current Patch Function is set to Dial On Audio, the VU Button will be
disabled since the Input audio is being monitored continuously for activity. The following
message is displayed:
MENU : VU Meters
STATUS : Not Valid
3.4 Menu Buttons
^
Menu Scroll Up / Previous button.
V
Menu Scroll Down / Next button.
>
Menu Select / Edit button is used to select the configuration which is to be modified.
NO
Menu No / Cancel button is used to answer No or to abort the configuration change. The NO
button is also used to exit a menu level and return to the level above. Pressing the NO button
several times will always take the user back to the Unit Description display.
YES
Menu Yes / Confirm button is used to answer Yes or to confirm the configuration change.

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3.5 DIAL Button
The DIAL button is used to dial an ISDN call.
(a) Manual Dial
The first depression of the DIAL button will take the unit into the Manual Dial menu as the
first option. This allows the user to type in an ISDN number via the keypad, an optional sub-
address can also be specified by use of the > button (translated to # ), followed by the sub-
address:
MENU : Manual Dial
01719082365#1
Once the ISDN number has been entered, the second depression of the DIAL button instructs
the unit to dial the ISDN number. The Manual Dial Option will use the Audio configurations
for the currently selected patch. The call status is then displayed as follows:
ISDN1: Ready
ISDN2: Ready MUTE
ISDN1: Dialling
ISDN2: Ready MUTE
If the call is successful then the following is displayed:
ISDN1: Connect
ISDN2: Ready SYNC
If the call fails to be established, then one of the following diagnostics messages is displayed
for 2 seconds:
ISDN CLEARING
Together with:
Error
Remote Error
Disconnected
Number Unobtainable
Number Incomplete
Number Changed
Network Busy
Number Busy
Line Out Of Service
Not Allowed
Acknowledgment
No Reply
Incompatible Dest
To Dial the second B Channel, repeat the above procedure. The audio bandwidth will
automatically adjust to include the additional B Channel data.

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(b) Patch / Memory Dial
The first depression of the DIAL button followed immediately by a second depression will take
the unit into the Patch / Memory Dial menu, allowing the user to access 1 of 20 pre-stored
configuration memories:
MENU : Patch Dial
PATCH A
The ^and Vbuttons can be used to select the required patch (1 of 20). A third depression of
the DIAL button instructs the unit to dial the ISDN numbers associated with the selected patch.
The call status is then displayed as (a) above
3.6 HANG Button
The Hang button is used to hang-up the ISDN calls. The following message will be displayed
for 2 seconds:
MENU : Hangup
STATUS : Clearing
If there is no call to hang-up, then the following is displayed for 2 seconds:
MENU : Hangup
STATUS : No Call
3.7 Numerical 0 - 9 Buttons
The 0 - 9 Numerical Keypad allows entry of ISDN numbers, sub-address information and for
use in patch names.

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4. Menu System
The menu system on the C300xr Audio Codec has been designed to allow the user to configure
the unit with ease. Five keys are used to drive the menu system :-
^UP
V DOWN
> RIGHT / EDIT
YES CONFIRM EDIT
NO ABORT EDIT / LEFT(BACK)
TITLE SCREEN
SELECT PATCH
STATUS
MODIFY PATCH
LOOPBACK
COUNTRY
OPTIONS
PATCH NAME
ISDN OPTIONS
X21OPTION S
CODEC
FUNCTION
AL AR M
ISDN AUDIO
ISDN DEST
NUMBER
CH2
ISDN DEST
SUB ADDRESS
CH 2
ISDN LOC
NUMBER
CH2
ISDN LOC
SUB ADDRESS
CH2
ISDN AUX
DATA PORT
ISDN CHAN
MAP
CH2
CHANNEL 2
OPTIONS
ISDN DATA
RATE
ISDN CLI
CH2
X21 AUDIO
X21 AUX
DATA PORT
AUTO HUNT
SET DEFAULTS
SILENCE
TIMEOUT
ISDN COUNTRY
ISDN SPID 1
CHANNEL 1
OPTIONS
ISDN DEST
NUMBER
CH1
ISDN DEST
SUB ADDRESS
CH1
ISDN LOC
NUMBER
CH1
ISDN LOC
SUB ADDRESS
CH1
ISDN CHAN
MAP
CH1
ISDN CLI
CH1
NUMBER
PREFIX
PASSWORD
SET
PASSWORD &
LEVEL
CALLER ID
ISDN SPID 2
ISDN LOC
NUM1
ISDN LOC
NUM2
X21 CONTROL
LINE
BACKUP
OPTIONS
BACKUP
MON ITOR
RESTORE
MON ITOR

Systembase C300xr 0018-013-009 Page 10 of 28
4.1 Unit Description
The software release and serial number of the unit are displayed on the Title screen as follows
:-
SYSTEMBASE C300xr
REL 002 S/N 0044-001
4.2 Status
The status of the ISDN and Audio is accessed by pressing the Vbutton when the Unit
Description above is shown, and is displayed as follows :-
ISDN1 : Ready
ISDN2 : Ready MUTE
The ISDN status options are:
ISDN : Idle, Ready, Dormant, Dialling, Connect, Clearing, Incoming, No Call, Trigger,
Alerting, B-ch OK
Please note that if the C300xr is configured in X.21 Mode, the ISDN port can still function,
however the audio will not be routed through to the ISDN connector.
The Audio status is displayed on the bottom right and the options are:
MUTE, SYNC
The C300xr has been designed to Mute the audio signal if end-to-end synchronisation is not
achieved.
4.3 Select Patch
The next menu is the Patch / Memory select screen:
MENU : Select Patch
STATUS : PATCH A
The >button is used to edit the current selection, the display changes as follows:
EDIT : Select Patch
OPTION : PATCH A
The ^and Vbuttons can be used to select the required patch:
OPTIONS : PATCH A to PATCH T
The YES button is used to confirm the selection, the NO button to abort the edit.

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4.4 Modify Patch
The next menu is the modify Patch / Memory screen:
MENU : Modify Patch
STATUS : PATCH A
The >button is, in this particular case, used to enter the next (second) level of the menu
system, which allows the user to modify the parameters associated with each patch.
4.4.1 Patch Name
MENU : Patch Name
STATUS : PATCH A
The >button can now be used to edit the patch name, the display changes as follows:
EDIT : Patch Name
The ^and Vbuttons can be used to scroll through A - Z and 0 - 9, the numerical keypad can
also be used for entry. The >button confirms the character selection and moves to the next
character position. There is no facility to edit a character once it has been confirmed. On
completion of entry of up to 10 characters, press the YES button to save the changes, and the
NO button to abort the changes:
MENU : Patch Name
LONDON MCR2
4.4.2 ISDN Options
MENU : Patch ISDN
The >button is once again used to enter the next (third) level of the menu system, which
allows the user to modify the parameters associated with ISDN operation.
4.4.2.1 ISDN Audio
MENU : ISDN Audio
STATUS : 3.7KHz Stereo
The >button can now be used to edit the ISDN Audio mode, the display changes as follows:
EDIT : ISDN Audio
OPTION : 3.7KHz Stereo
The ^and Vbuttons can be used to select the required ISDN Audio mode:
OPTIONS : 3.7KHz Stereo, 7.5KHz Mono, 7.5KHz Stereo, 15KHz Mono
The YES button is used to confirm the selection, the NO button to abort the edit.

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Please note that when operating in Mono, only the Left Channel input and output are active.
4.4.2.2 Channel 1 Options / Channel 2 Options
MENU : Ch1 Options / Ch2 Options
The >button is used to edit the ISDN parameter associated with each ISDN B Channel. The
following 6 option menus are repeated for both Channels.
4.4.2.2.1 ISDN Destination Number
MENU : ISDN Dest Num
Null
The >button is used to edit the ISDN Destination Number, the display changes as follows:
EDIT : ISDN Dest Num
The ^and Vbuttons can be used to scroll through 0 - 9, the numerical keypad can also be used
for entry. The >button confirms the character selection and moves to the next character
position. There is no facility to edit a character once it has been confirmed. On completion of
entry of up to 18 digits, press the YES button to save the changes, and the NO button to abort
the changes:
MENU : ISDN Dest Num
01719082365
4.4.2.2.2 ISDN Destination Sub-Address
MENU : ISDN Dest Sub
Null
The >button is used to edit the ISDN Destination Sub-Address, applicable only if subscribed
to. The display changes as follows:
EDIT : ISDN Dest Sub
The ^and Vbuttons can be used to scroll through A - Z and 0 - 9, the numerical keypad can
also be used for entry. The >button confirms the character selection and moves to the next
character position. There is no facility to edit a character once it has been confirmed. On
completion of entry of up to 6 characters, press the YES button to save the changes, and the
NO button to abort the changes:
MENU : ISDN Dest Sub
1
4.4.2.2.3 ISDN Local Number

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MENU : ISDN Loc Num
Null
The >button is used to edit the ISDN Local Number, applicable only if subscribed to Multiple
Subscriber Numbering (MSN). The display changes as follows:
EDIT : ISDN Loc Num
The ^and Vbuttons can be used to scroll through 0 - 9, the numerical keypad can also be used
for entry. The >button confirms the character selection and moves to the next character
position. There is no facility to edit a character once it has been confirmed. On completion of
entry of up to 18 digits, press the YES button to save the changes, and the NO button to abort
the changes:
MENU : ISDN Loc Num
01912269835
4.4.2.2.4 ISDN Local Sub-Address
MENU : ISDN Loc Sub
Null
The >button is used to edit the ISDN Local Sub-Address, the display changes as follows:
EDIT : ISDN Loc Sub
The ^and Vbuttons can be used to scroll through A - Z and 0 - 9, the numerical keypad can
also be used for entry. The >button confirms the character selection and moves to the next
character position. There is no facility to edit a character once it has been confirmed. On
completion of entry of up to 6 characters, press the YES button to save the changes, and the
NO button to abort the changes:
MENU : ISDN Loc Sub
1
4.4.2.2.5 ISDN Channel Mapping
MENU : ISDN Chan Map
STATUS : B1&B2
The >button can now be used to select the ISDN Channel Mapping, the display changes as
follows:
EDIT : ISDN Chan Map
OPTION : B1&B2
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : B1&B2, B1, B2
Press the YES button to save the changes, and the NO button to abort the changes:

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MENU : ISDN Chan Map
STATUS : B1
4.4.2.2.6 ISDN Caller Line Identification (CLI)
MENU : ISDN CLI
Null
The >button is used to edit the ISDN Caller Line Identification, which is applicable only if
subscribed to. The display changes as follows:
EDIT : ISDN CLI
The ^and Vbuttons can be used to scroll through 0 - 9, the numerical keypad can also be used
for entry. The >button confirms the character selection and moves to the next character
position. There is no facility to edit a character once it has been confirmed. On completion of
entry of up to 18 digits, press the YES button to save the changes, and the NO button to abort
the changes:
MENU : ISDN CLI
01912269835
4.4.2.3 ISDN Data Rate
MENU : ISDN Data Rate
STATUS : 64Kbps
The >button can now be used to select the ISDN Data Rate, the display changes as follows:
EDIT : ISDN Data Rate
OPTION : 64Kbps
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : 64Kbps, 56Kbps
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : ISDN Data Rate
STATUS : 56Kbps
4.4.2.4 ISDN Auxiliary Data Port
MENU : ISDN Aux Data
STATUS : Off

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The >button can now be used to select the ISDN Auxiliary Data Port Mode, the display
changes as follows:
EDIT : ISDN Aux Data
OPTION : 2400bps
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : Off, 2400bps
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : ISDN Aux Data
OPTION : 2400bps
4.4.2.5 Auto Hunt (Detect Incoming Audio Mode)
MENU : Auto Hunt
STATUS: Off
The >button is used to edit the Auto Hunt mode. The display changes as follows:
EDIT : Auto Hunt
OPTION: Off
The ^and Vbuttons can be used to select either 'on' or 'off'. If 'on' is selected then the codec
will automatically detect the format of the incoming audio; Mono/Stereo, 3.7KHz / 7.5KHz /
15KHz, 64Kbps/56Kbps, and re-configure its mode to match. The re-configuration is for the
duration of the incoming call, the C300xr codec will revert back to the original configuration
when the call is terminated.
4.4.2.6 Silence Timeout (Dial on Audio)
MENU : Silence Timeout
STATUS: 1 minute
The >button is used to edit the Silence Timeout period associated with the Dial On Audio
mode of operation. The display changes as follows:
EDIT : Silence Timeout
STATUS: 1 minute
The ^and Vbuttons can be used to change the Silence Timeout period in multiples of 1
minute, up to a maximum of 8 minutes. The Patch Function must be set to Dial On Audio for
the Silence Timeout period to be active.

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4.4.3 X.21 Options
The >button is once again used to enter the next (third) level of the menu system, which
allows the user to modify the parameters associated with X.21 operation.
4.4.3.1 X.21 Audio
MENU : X.21 Audio
STATUS : 3.7KHz Stereo
The >button can now be used to edit the X.21 Audio mode, the display changes as follows:
EDIT : X.21 Audio
OPTION : 3.7KHz Stereo
The ^and Vbuttons can be used to select the required X.21 Audio mode:
OPTIONS : 3.7KHz Stereo, 7.5KHz Mono, 7.5KHz Stereo, 15KHz Mono, 15KHz Stereo
The YES button is used to confirm the selection, the NO button to abort the edit:
MENU : X.21 Audio
STATUS : 15KHz Stereo
Please note that when operating in Mono, only the Left Channel input and output are active.
4.4.3.2 X.21 Auxiliary Data Port
MENU : X.21 Aux Data
STATUS : Off
The >button is used to select the X.21 Auxiliary Data Port Mode, the display changes as
follows:
EDIT : X.21 Aux Data
OPTION : 2400bps
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : Off, 2400bps
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : X.21 Aux Data
OPTION : 2400bps
4.4.3.3 X.21 Control Line
MENU : X.21 Ctl Line
STATUS : Off
The >button is used to enable/disable the X.21 Control Line, the display changes as follows:

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EDIT : X.21 Ctl Line
OPTION : Off
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : Off, On
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : X.21 Ctl Line
OPTION : On
4.4.4 Backup Options
The >button is once again used to enter the next level of the menu system, which allows the
user to modify the parameters associated with the automatic ISDN Backup operation.
NOTE: The Backup Level and Restore Time are global settings, and not per Patch memory.
4.4.4.1 Backup Monitor
MENU : Backup Monitor
Level = 050 Errors = 000 (Factory Defaults – Errors = 000 if X.21 Line Connected)
This menu displays the number of Sync Loss Errors in the last 10 seconds, (sampled at 100ms
intervals), and the Level at which the automatic ISDN Backup is initiated. The Backup Level
can be set to different values on the Master and Slave units, in order to bias the sensitivity of
the link in either direction.
The >button can be used to edit the Backup Level , the display changes as follows:
EDIT : Backup Monitor
Level = 050 Errors = 000
The ^and Vbuttons can be used to select the required Backup Level (0 to 100).
The YES button is used to confirm the selection, the NO button to abort the edit:
MENU : Backup Monitor
Level = 004 Errors = 000
4.4.4.2 Restore Monitor
MENU : Restore Monitor
Time = 05s Errors = 000 (Factory Defaults)
This menu displays the number of Data Block Errors in the last 10 seconds, (sampled at 100ms
intervals), when the ISDN Backup has successfully been established. The menu also displays
the Restore Time in seconds of error free data throughput, after which the automatic X.21
Restore is initiated. The Restore Time setting and the Errors display are only relevant when the
codec is operating in the Backup Master mode.

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The >button can be used to edit the Restore Time , the display changes as follows:
EDIT : Restore Monitor
Time = 05s Errors = 000
The ^and Vbuttons can be used to select the required Restore Time (1 to 20 seconds).
The YES button is used to confirm the selection, the NO button to abort the edit:
MENU : Restore Monitor
Time = 10s Errors = 000
4.4.5 Codec Function
The C300xr Codec can operate in 1 of 5 selectable modes; ISDN, X.21, X.21 with ISDN
Backup - Master Unit or Slave Unit and Dial On Audio.
Dial On Audio Mode
When operating in Dial On Audio mode, the Input audio channels are monitored continuously
for activity. On detection of a signal which is above -27 dB, the unit will automatically dial the
pre-configured ISDN number for the current patch. If the ISDN call fails to be established for
any reason, the unit will re-dial until it has successfully connected through. Similarly, if the
ISDN call is terminated, other than by the unit which initiated the call, a re-dial will be
activated automatically.
Once the ISDN call has been established the Silence Timeout period is used to determine when
the call is terminated. The Silence Timeout period can be set to a minimum of 1 minute and a
maximum of 8 minutes, in increments of 1 minute.
The ISDN call can also be manually terminated by the unit which initiated the call, using the
HANG button.
NOTE: When operating in Dial On Audio Mode the VU Meters are locked to monitor the input
audio only. The user can not change the VU Meter setting to monitor the output audio.
X.21 Mode
Please note that when operating in X.21 mode, the ISDN port will still be functional, however
the audio will not be routed through to the ISDN connector.
Backup Master / Slave Mode
In the X.21 with ISDN Backup mode, the unit at one end of the X.21 line should be configured
as a Master Unit and the other unit should be configured as a Slave Unit. This prevents both
units initiating the ISDN Backup, which can cause a call conflict. ISDN Backup is initiated
following 5 seconds of loss of synchronisation on the X.21 line. The automatic X.21 Restore
occurs following 10 seconds of error free, continuous, synchronisation on the X.21 line.
NOTE: When operating in ISDN Backup Mode, it is advised that the DCE should carry X.21
termination resistors, please contact Systembase Limited or an authorised distributor for further
information.
The >button is used to select the Operating Mode for the current patch.
MENU : Codec Function

Systembase C300xr 0018-013-009 Page 19 of 28
STATUS : ISDN Mode
The display changes as follows:
EDIT : Codec Function
OPTION : ISDN Mode
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : ISDN Mode, Dial On Audio, X21 Mode, Backup Master, Backup Slave
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : Codec Function
STATUS : Backup Slave
4.4.6 Alarm
MENU : Alarm
STATUS : Off
The >button is used to select the Alarm Mode, the display changes as follows:
EDIT : Alarm
OPTION : Off
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : Off, Sync Loss, Backup
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : Alarm
STATUS : Sync Loss
4.5 Loopback
The C300xr can be configured to provide an internal digital loopback of the compressed audio
signal prior to the X.21 / ISDN interface. A loopback of the receive signal also occurs as a
result, enabling the units to be tested independently.
MENU : Loopback
STATUS : Loop Off
The >button is used to select the Loopback Mode, the display changes as follows:
EDIT : Loopback
OPTION : Loop On
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : Loop On, Loop Off

Systembase C300xr 0018-013-009 Page 20 of 28
Press the YES button to save the changes, and the NO button to abort the changes:
MENU : Loopback
STATUS : Loop On
NOTE : The loopback function has been disabled when operating in either Dial On Audio or
Backup Master / Slave Modes.
4.6 ISDN Country Options
There are a number of ISDN parameters associated with different countries and regions in the
world, these can be readily re-configured on the C300xr Codec.
NOTE : It is important that the ISDN line should be disconnected from the unit before any
changes are made.
4.6.1 ISDN Country
The C300xr can be re-configured to operate on 1 of 10 International ISDN Standards.
MENU : ISDN Country
STATUS : EURO ETSI
The >button is used to select the ISDN Country / Standard, the display changes as follows:
EDIT : ISDN Country
OPTION : EURO ETSI
The ^and Vbuttons can be used to scroll through the options:
OPTIONS : EURO ETSI, Eire, France VN3, Israel*, Japan, Australia*, Holland,
DMS100 (USA), Custom 5ESS (USA), National 1 (USA)
*Pending Approvals
Press the YES button to save the changes, and the NO button to abort the changes. Then
confirm the change by pressing YES and wait while the C300xr is configured for the new
ISDN Country:
MENU : ISDN Country
STATUS : Holland
4.6.2 ISDN SPID 1 / 2 (USA Only)
MENU : ISDN SPID 1 / 2
Null
The >button is used to edit the ISDN SPID Codes which are required for operation in the USA
(National 1, DMS100 & Custom 5ESS). The display changes as follows: