Specifications

42 MDS entraNET 900 System Guide MDS 05-4055A01, Rev. A
3.5 CONFIGURING THE SERIAL
INTERFACES
3.5.1 Overview
To understand the operation of the radio system, it may be helpful to
visualize the AP and the Remotes as being in a single box, with the AP
ports on one side and all of the Remotes on the other (see Figure 3-14).
In practice, the units are typically separated by considerable distances,
but viewing them as a single unit will be helpful for this discussion.
Most system processing is done at the AP, and thus, majority of the con-
figuration for the Remote units must also be performed at the AP. The
AP requires configuration of its local interfaces (Ethernet or Serial) and
its remote interfaces—the latter being physically located at the Remote
radios. A few parameters must also be configured at the individual
Remote units.
Invisible place holder
Figure 3-14. Conceptual Views of Radio System
The AP includes an embedded terminal server that provides access to
Remote serial ports via an IP or serial connection at the AP. In this
capacity, it acts as a gateway between IP and Remote serial devices (thus
the name “Serial Gateway), or a transparent over-the-air serial-to-serial
connection.
IP-to-Serial Services
When the AP transceiver is used as an IP-to-serial gateway, two types
of IP terminal services are possible—TCP and UDP. TCP provides a
connection-oriented link, with end-to-end acknowledgment of data, but
with some added overhead. UDP provides a best-effort delivery service
with less overhead than TCP.
ACCESS POINT
(AP)
REMOTE 1
REMOTE 2
REMOTE 3
REMOTE 4
Serial Data
Serial Data
Serial Data
Serial Data
Serial Data
SERIAL-TO-SERIAL EXAMPLE
ACCESS POINT
(AP)
Ethernet
IP-TO-LOCAL SERIAL EXAMPLE
Serial