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Chapter 2 PTP 820F Hardware Overview
PTP 820F is a compact unit that fits in a single rack unit, with a passive cooling system that
eliminates the need for fans. A PTP 820F system consists of a PTP 820F indoor unit (IDU) and up to
three radio frequency units (RFUs). The IDU is connected to each RFU by a standard Cat-5e or
preferably Cat-6/6e cable, with RF-45 connectors on the RFU and electrical or optical fiber via SFP
on the IDU. This cable transmits traffic and management data between the IDU and the RFU. For
RFU-S and RFU-D connected to an electrical RFU interface on the IDU, this cable also provides DC -
48V power to the RFU. For RFU-S or RFU-D using an optical fiber connection, and for RFU-D-HP
using an electrical or optical fiber connection, an external DC power cable is required.
A PTP 820F IDU contains:
•
Three 1 GbE combo interfaces
•
Two dual mode GbE or cascading combo interfaces
•
Two combo (RJ-45 or SFP) radio interfaces
•
An additional interface that can be configured as a combo (RJ-45 or SFP) radio interface or a 1
GbE interface
For TDM traffic, a PTP 820F IDU includes a 16 x E1/DS1 interface and two STM 1/OC-3 interfaces that
require the addition of an optional rear-mounted STM-1/OC-3 module. The STM-1/OC-3 interfaces
can be used in a 1+1 STM 1/OC 3 protection configuration.
The IDU also includes two FE management interfaces, a DB9 dry contact external alarms interface,
and an RJ-45 terminal console interface for connection to a local craft terminal. Optionally, one of
the FE management interfaces can be used as an RJ-45 synchronization interface.
PTP 820F receives an external supply of -48V, with a dual-feed option for power redundancy.
Figure 1 PTP 820F Front Panel and Interfaces
Ethernet Traffic Interfaces
The front panel of the PTP 820F contains 4 x GbE combo interfaces (electrical or optical) for
Ethernet traffic. These interfaces are numbered as shown in Figure 2.
2-6
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