User guide

80 RealCT Direct API Developer Guide
Chapter 3: T1 Networking
Connecting Trunks A and B
When you connect trunks A and B, you receive data on one
trunk that you send from the other trunk. Using this
configuration, you can test samples that complement your
application or use the samples that came with your software.
Using either your own or provided samples, you can test
inbound and outbound call processing, send events out of order
to see how the application reacts, and stress test the
application.
When you connect both trunks, be sure that the transmit leads
from one cable connect to the receive leads of the other cable,
and vice versa. There are two ways to be sure the cables connect
properly. The first is to use a crossover cable, which connects the
transmit and receive leads of one cable to the appropriate leads
on the other cable. The other way (available only with
RTNI-2T1 or -2E1 boards) is to set the mode of the trunk using
hardware jumpers, then connect the trunks using a regular
cable. Set one trunk to user mode and the other trunk to
network mode, as described in your hardware installation
guide. For normal operation, both trunks should be set to user
mode. Figure 13 shows trunks A and B connected by a cable. In
this configuration, trunk A and B transmit and receive data
from each other rather than the CO.
Figure 13. Connecting Trunks A and B in T1
Board