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Power Interfaces
PTP 820F receives an external supply of -48V current via a dual-feed power interface, which can be
connected to two separate power sources for power redundancy. The PTP 820F monitors the power
supply for under-voltage and includes reverse polarity protection, so that if the positive (+) and
negative (-) inputs are mixed up, the system remains shut down.
The allowed power input range for the PTP 820F is -40V to -60V. An under-voltage alarm is
triggered if the power goes below the allowed range, and an over voltage alarm is triggered if the
power goes above the allowed range.
Synchronization Interface
PTP 820F includes an RJ-45 synchronization interface for T3 clock input and T4 clock output. The
interface is the lower RJ-45 interface in a pair of interfaces labeled MGMT/SYNC.
Terminal Interface
PTP 820F includes an RJ-45 terminal interface (RS-232). A local craft terminal can be connected to
the terminal interface for local CLI management of the unit.
External Alarms
PTP 820F includes a DB9 dry contact external alarms interface. The external alarms interface
supports five input alarms and a single output alarm.
The input alarms are configurable according to:
1.
Intermediate
2.
Critical
3.
Major
4.
Minor
5.
Warning
The output alarm is configured according to predefined categories.
Storage Memory Card
Each PTP 820F unit includes a Storage Memory card (SM card). The SM card holds the configuration
and software for the IDU. The SM-Card is embedded in the SM-Card plastic cover that is located
under the SM-card aluminum cover. In the event of IDU replacement, re-using the existing SM card
cover is necessary to ensure that the unit’s software and configuration is maintained.
An SM card is pre-installed inside each PTP 820F unit. It can also be ordered as a separate item (e.g.,
as a spare unit).
Note
For some RFUs, PoE power can be supplied directly from the IDU via an RJ-45 radio
interface. See
