Importing Time Signals from an External BITS Source

On a 1588v2 network, time signals are typically imported from an external BITS source. You can configure multiple routers to import time signals from an external BITS source. A master clock can be selected dynamically or statically.

Context

BITSs provide time signals for routers. 1588v2 routers can be configured to import time signals from BITSs and use the BMC algorithm to select a master clock. The master clock provides time signals for other devices over a 1588v2 network. 1588v2 routers obtain clock synchronization information from the grandmaster.

Perform the following steps on each router that is connected to a BITS on a 1588v2 network:

Procedure

Run system-view
The system view is displayed.
Select the type of the input time signal.
The following example shows how to import an external clock source from the 1pps bits1 interface.
```
clock bits-type bits1 1pps input
```
The actual number of BITS interfaces and their numbers depend on the hardware configuration. For details about clock interfaces, see Hardware Description.

Generally, BITS0 provides frequency signals for physical clock synchronization and corresponds to CLK or CLK/TOD0 on the interface panel; BITS1 provides time signals and corresponds to TOD or CLK/TOD1 on the interface panel.
Configure BITS signals to participate in BMC calculation.
The following example uses BITS1 signals.
```
ptp clock-source bits1 on
```
(Optional) Configure the correction time for the delay in sending and receiving time signals from the BITS interface.
Configuration on the BITS1 interface is used as an example.
```
ptp clock-source bits1 { receive-delay receive-delay-value | send-delay send-delay-value }
```
Run commit
The configuration is committed.