Connection to the Network
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The configuration procedure to enable the reference clock output is detailed in the
following steps:
1. From the Home panel, go to CONFIG,
The port setup panel is displayed.
2. Go to Reference clock.
3. Configure Output clock to Clock/PCM (Port Ref. In/Out), ToD (Port Ref. In/Out),
1PPS (Port Ref. In/Out), 1PP2S (Port Ref. In/Out), 1PPS (Ref SMB) or
1PP2S (Ref SMB).
4. If you have chosen Clock/PCM (Port Ref. In/Out) in the previous step, configure
Clock/PCM Output, Connector, Frame structure and SSM signaling from the
Clock/PCM output interfaces menu.If you have chosen ToD (Port Ref. In/Out),
1PPS (Port Ref. In/Out), 1PP2S (Port Ref. In/Out), 1PPS (Ref SMB) or
1PP2S (Ref SMB) configure the Output reference delay to compensate for the
cable delay. If you have chosen ToD (Port Ref. In/Out), configure the Output ToD
protocol too.
SSM signaling Enables or disables the Synchronization Status Message
(SSM) clock reference output. The SSM transports informa-
tion about the current synchronization performance level
transported in the E1 or T1 signal. The SSM information can
be used by network clocks or other devices to know if the E1
or T1 signal is a reliable synchronization source.
The SSM requires a frame structure with CRC in E1 inter-
faces (PCM30C or PCM31C). In T1 interfaces it requires
FDL, which is only available with the ESF frame structure.
The E1 NFAS also requires the user to configure which
NFAS bit is used to transmit the message.
Table 2.15: PPS/ToD output Interfaces Options
Parameter Description
Output ToD Protocol Configures the protocol in a ToD clock reference output. The
supported protocols are ITU-T G.8271 and NMEA. You can
also disable the ToD protocol. In that case, the interface is
equivalent to a 1 PPS over a balanced interface.
Table 2.14: Clock/PCM output interfaces Options
Parameter Description
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