AudioCodes Mediant 8000 - Timing Module Line Sync Clock Mode

Installation & Operation Manual 522 Document # LTRT-92224
Mediant 8000
Parameter Name Type
Provisioning
Type
Description
Transmit Control Enum
SystemClock,
DerivedLine, AIS,
Disable
Instant Defines the transmission pattern on the
clock synchronization interfaces.
External Ref 1
Clock Priority
Enum
Not Used, Low,
High
Instant Defines the priority of the 1
st
external
reference clock (connected to the BITS
1). Priority Not Used means that tbe
specific reference clock is not used.
External Ref 2
Clock Priority
Enum
Not Used, Low,
High
Instant Defines the priority of the 2
nd
external
reference clock (connected to the BITS
2). Priority Not Used means that the
specific reference clock is not used.
38.8.3 Timing Module Line Sync Clock Mode
In Timing Module Line Sync clock mode, all Media Gateway boards are synchronized
by “reference” to OC-3/STM-1 links or E1/T1/T3 trunks connected to the specific
Media Gateway boards. Up to four clock reference” source fiber links or trunks may be
defined in the Mediant 8000 Media Gateway and one clock reference source can be
defined per board. Each of these links are assigned with a user-defined priority.
The clock is distributed across all Media Gateway boards via SA/RTM with a
designated Timing Module. Two SA/RTMs are required to ensure seamless clock
operation in case of failure of one of the SA/RTM modules.
Note: To activate the Timing Module Line Sync clock mode, you must order SA-
1/RTMs (SA/RTM with a resident Timing Module). To order the Media Gateway
with this module, refer to the AudioCodes price list.
When one of the clock reference source links/trunks fails, the Timing Module
automatically switches to another source and continues using it as a reference clock
source for the whole Media Gateway. The user may prevent the use of the specific
reference source by locking the corresponding line in the TM Line Sync Settings tab
(see below).