Cisco Systems A9014CFD manual Configuring Clocking, Restrictions, 22-1

C H A P T E R 22

Configuring Clocking

This chapter provides information about configuring clocking on the Cisco ASR 901 Series Aggregation Services Router.

Contents

•Restrictions, page 22-1

•Configuring Network Clock for Cisco ASR 901 Router, page 22-2

•Configuring PTP for the Cisco ASR 901 Router, page 22-18

Restrictions

•External interfaces like Building Integrated Timing Supply (BITS) and 1 Pulse Per Second (1PPS) have only one port. These interfaces can be used as either an input interface or output interface at a given time.

•The line to external option is not supported for external Synchronization Supply Unit (SSU).

•Time-of-Day (ToD) is not integrated to the router system time. ToD input or output reflects only the PTP time, not the router system time.

•Revertive and non-revertive modes work correctly only with two clock sources.

•BITS cable length option is supported via platform timing bits line-build-outcommand.

•There is no automatic recovery from out-of-resource (OOR) alarms. OOR alarms must be manually cleared using clear platform timing oor-alarmscommand.

•If copper Gigabit Ethernet port is selected as the input clock source, the link must be configured as a IEEE 802.3 link-slave, using synce state slave command.

•BITS reports loss of signal (LOS) only for Alarm Indication Signal (AIS), LOS, and loss of frame (LOF) alarms.

•The clock source line command does not support loop timing in T1/E1 controllers. However, the clock can be recovered from T1/E1 lines and used to synchronize the system clock using the network-clockinput-sourcepriority controller E1/T1 0/x command.

•Adaptive clocking is not supported in Cisco ASR 901 router.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		22-1