[yugabyte#21963] YSQL: Configure clockbound agent

docs/content/preview/deploy/manual-deployment/system-config.md

@@ -23,6 +23,8 @@ In particular, the main YugabyteDB process, the YB-TServer, is multi-threaded. A
 
 ## ntp
 
+YugabyteDB relies on clock synchronization to guarantee consistency in distributed transactions.
+
 If your instance does not have public Internet access, make sure the ntp package is installed:
 
 ```sh
@@ -35,6 +37,35 @@ As of CentOS 8, `ntp` is no longer available and has been replaced by `chrony`.
 $ sudo yum install -y chrony
 ```
 
+### PHC (PTP Hardware Clock)
+
+**Supported Platforms:** AWS
+
+{{<tags/feature/tp>}} PTP Hardware Clock (PHC) refers to a physical clock device that supports the [Precision Time Protocol (PTP)](https://en.wikipedia.org/wiki/Precision_Time_Protocol), which is a network protocol used for highly accurate time synchronization.
+
+To check if your AWS instance supports PHC, see [AWS PTP Hardware Clock](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configure-ec2-ntp.html#connect-to-the-ptp-hardware-clock).
+
+Configure PTP using the `configure_ptp.sh` script in the bin directory of your YugabyteDB home directory as follows:
+
+```sh
+sudo bash ./bin/configure_ptp.sh
+```
+
+### Clockbound Agent
+
+{{<tags/feature/tp>}} Although optional, configuring a clockbound agent improves clock accuracy significantly.
+While PHC is beneficial, it is not required for configuring clockbound. However, Chrony is a necessary prerequisite.
+
+Configure a clockbound agent using the `configure_clockbound.sh` script in the bin directory of your YugabyteDB home directory as follows:
+
+```sh
+sudo bash ./bin/configure_clockbound.sh
+```
+
+After configuring a clockbound agent, you must configure the [YB-TServer](../start-tservers/) and [YB-Master](../start-masters/) servers with the `time_source=clockbound` flag.
+
+If the clockbound agent is configured with PHC, use a more aggressive clock error estimate such as `clockbound_clock_error_estimate_usec=100`.
+
 ## ulimits
 
 In Linux, `ulimit` is used to limit and control the usage of system resources (threads, files, and network connections) on a per-process or per-user basis.