Specifications

S
X-2000 General Information Guide
1
0 Revision A 5000309
7
R2 Support
An R2 card allows the SX-2000 system to access the R2 National Public Switched Telephone
Network (PSTN) with MF-R2 digital trunk signaling. The protocol converter accepts incoming
MF-R2 signals from the PSTN and turns them into signals for the SX-2000 system. Similarly,
the converter turns outgoing signals from the SX-2000 into MF-R2 signals for the PSTN.
The R2 protocol converter supports the CCITT Blue Book, Volume VI, Fascicle VI.4,
Specifications of Signaling System R2, Recommendations Q.440 to Q.490 (with the exception
of Echo Suppression (Q.479), Test Calls (Q.490) and international signals).
Although many countries use R2 signaling, most do not adhere to the CCITT recommendations
in their entirety, and there are many protocol variations around the world. R2 support on the
SX-2000 system provides exceptional flexibility, which enables you to support the regional
variations in the R2 protocol. Line signaling, tone interpretation, and timing parameters for the
converter can be adapted to suit any national or regional requirement. For example:
• Line signaling features allow you to program up to four bits to define the incoming and
outgoing patterns for line signals such as Idle and Answer.
• Register signaling features allow you to program the type of address signaling termination
(signaled or timed) and whether signaling should be fully-compelled or semi-compelled.
These features also allow you to define each register signaling tone individually.
Line Signaling
Line signaling is used to begin and terminate the call setup process. Line signaling features in
IMAT allow you to program up to four bits to define the incoming and outgoing tone patterns
for the following line signals:
•Idle
•Seize
•Seize Ack
•Answer
•Clear Backward
• Clear Forward
• Blocking