Configuring External Clock Synchronization For Acx Series Routers - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Configuring External Clock Synchronization for ACX Series Routers

Setting the Ethernet equipment clock (EEC) network type
228
Configuring priority is optional. When not specified,
than , and has a higher default priority than Gigabit Ethernet, 10-Gigabit Ethernet,
bits bits
and T1 or E1 clock, which have the lowest default priority.
When QL is enabled, the received QL must be equal to or better than the configured
QL for that particular source or else that source will not be considered for clock
selection. This is so that a downstream client is guaranteed clock quality of a certain
level (that "certain level" being the configured QL).
During clock selection:
The active source with the highest QL is selected.
If QL is the same for two or more sources, then the source with the highest priority is
selected.
If two or more sources have the same QL and priority, then the currently active source,
if any, among these sources is selected.
If two or more sources have the same QL and priority, and none of these is currently
active, then any one of these may be selected.
If selection-mode is configured quality, then the configured (or default) QL of the
selected clock source is used for transmitting ESMC. If selection-mode is received
quality, then the received QL of the selected clock source is used for ESMC transmit.
In order to receive or transmit ESMC messages out of an interface, at least one logical
interface should be configured on that interface. If the interface is currently not
configured with a logical interface, you may do so using the
statement at the
unit 0 edit
Configuring External Clock Synchronization for ACX Series Routers on page 228
Understanding Interfaces on ACX Series Universal Access Routers on page 94
The ACX Series Universal Access Routers support external clock synchronization for
Synchronous Ethernet, T1 or E1 line timing sources, and external inputs. Configuring
external clock synchronization requires making clock selection, quality level (QL), and
priority considerations. The clock source selection algorithm is used to pick the two best
upstream clock sources from among all the various sources, based on system
configuration and execution criteria such as QL, priority, and hardware restrictions.
To configure external synchronization on the router, include the
at the hierarchy level.
[edit chassis]
The network type options set the frequency of the configured clock. When
configured with option-1 on the ACX router, the Synchronous Ethernet equipment is
optimized for 2048 Kbps, the speed of an E1 interface. When
gps
hierarchy level.
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has a higher default priority
set interfaces interface-name
statement
synchronization
is
bits
is configured with
bits