Configuring Transmit Timing Source; Configure Bits As The Timing Source - Cisco ASR 5000 Administration Manual
Staros release 21.1
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- Installation manual (294 pages) ,
- Administration manual (159 pages) ,
- Installation procedure (8 pages)
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System Settings
Column Title
delay
offset
jitter
Configuring Transmit Timing Source
This feature is only for application services that use SDH or SONET over optical (OLC/OLC2) or channelized
(CLC/CLC2) line cards.
In general, the SPIO automatically provides clocking based on the system clock. However, some application
services that use SDH or SONET require greater clocking precision to ensure synchronous transmission. The
timing source options include Building Integrated Timing Supply (BITS) and line-timing.
BITS-timing accepts external clock signals from a BITS source that relies on Stratum 1 or GPS timing signals
for high accuracy.
Line-timing recovers the transmit timing from a specified port on an OLC/OLC2 or CLC/CLC2. This method
of timing requires that the SPIO be equipped with the optional Stratum 3 clock module.
The timing is then distributed via the SPIO to all line cards in the chassis.
Important
You can enable and configure up to four timing sources: two BITS-timing and two line-timing sources. Having
more than one timing source assures redundancy. When enabled BITS-timing always takes priority over
line-timing for system clocking.
Configure BITS as the Timing Source
Use the following example to configure BITS as the timing source:
configure
port bits slot#/port#
For additional information, refer to the BITS Port Configuration Mode Commands chapter of the Command
Line Interface Reference.
Save the configuration according to the steps in Verifying and Saving Your Configuration.
Description
Round-trip delay (in milliseconds) for messages exchanged between the system and the NTP server.
Number of milliseconds by which the system clock must be adjusted to synchronize it with the NTP
server.
Jitter in milliseconds between the system and the NTP server.
To use BITS-timing, the SPIO card must include the optional BITS E1 BNC or T1 (DS1)3-pin timing
interface. For additional interface information, refer to the ASR 5000 Installation Guide.
mode {e1|t1} framing type
no shutdown
end
Configuring Transmit Timing Source
ASR 5000 System Administration Guide, StarOS Release 21.1
43
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