Symmetricom EDGE CLOCK 1000 - Manual (Page 111)

097-58001-02 Revision G – April 2008 TimeProvider User’s Guide 111
Chapter 4 Provisioning the TimeProvider
Provisioning the Input Reference
Sample Command
ED-SYNC::INP1:TS1000::FRMTYPE=ESF;
Autonomous Message
TP-SSU 03-10-24 10:50:05
A 1181 REPT EVT
“INP1,T1:NA,FRMTYPE,NSA,03-10-24 10-50-05:\"INPUT FRAMING
TYPE HAS CHANGED,ESF\””
;
Controlling Automatic Reference Switching
The TimeProvider can determine which input reference signal has the highest
quality. When the active reference signal falls below a preset quality level, the
TimeProvider can automatically switch to the next highest input reference signal. To
use this feature, you must enable Automatic switching.
You can also use the performance monitoring features to automatically switch the
input reference signal when user-defined performance thresholds are crossed. See
Setting MTIE and FFOFF Thresholds , on page 116 for more information on setting
and using performance monitoring commands.
Automatic Return to a Higher Priority Reference
When the REFMODE parameter is provisioned to AUTO, the system reference
switches when the input signal is disqualified. When the input signal is re-qualified,
the TimeProvider can either keep the current reference or switch back to the
re-qualified signal. The first case, keeping the current reference, is also known as
“non-revertive” mode; the second case, switching back to the re-qualified input, is
known as revertive mode.
The QLEVEL (see Setting the Input Quality Level , on page 112) and the PRIORITY
(see Setting the Input Priority Level , on page 113) parameters work together with
SSMs to determine the switching strategy for the inputs when the unit is in the SSU
mode. If the active/primary input becomes unavailable, the switching strategy
determines which input to use: the TimeProvider uses the input with the next
highest QLEVEL. If all inputs have the same QLEVEL, then the TimeProvider uses
the input with the highest PRIORITY.
To provision the TimeProvider as non-revertive, you must provision the
user-assigned Priority Level on all inputs to the same value (1, 2, 3, or 4). To
provision the TimeProvider as revertive, you provision any one of the inputs to a
higher or lower Priority Level, with 1 being the highest priority.
<aid> <keyword> <value> Description Default value
INPp
p = 1 | 2 FRMTYPE 2M (2.048 MHz) | CAS |
CCS | D4 | ESF |
1.544M | 6.312M | CC |
JCC | JCC4 Provisions the frame
signal type used by
the input. 2M (E1)
ESF (T1)