- The
TN789 circuit pack is an interface between a DEFINITY system and
2 Wireless Fixed Base (WFB) radio units for the DEFINITY wireless
business system R1-PWT.
- The
TN789 contains a main processor to handle data line circuit (DLC)
and upper medium access (MAC) layers of firmware.
- The
TN789 also contains 2 lower MAC processors; 1 for each radio interface.
Each radio interface is referred to as an I2 interface.
- The
I2 link is the connection between the Radio Controller (RC) and
the WFB. The RC supports up to two I2 links, each link consisting
of 4 pairs of twisted-pair cable: the transmit pair, the receive
pair, and the local power pair.
- The
transmit pair transfers WFB control and frame information from
the RC to the WFB.
- The
receive pair transfers status and frame information from the WFB
to the RC. If the RC cannot provide power to the WFB, a third
pair (to the WFB) can supply local power. When possible, the transmit
pair and the receive pair provide phantom power from the RC to
the WFB.
- Each
circuit pack includes a standard TDM bus interface from a system,
2 radio interfaces to 2 separate radio units, and 2 synchronization
ports.
- In
addition, 2 RS-232 interfaces provide for a debug terminal and
for setting up the wireless terminal. Provides an interface to
Wizard II base stations (DWBS).
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