System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Ring polling
Page 2-38 Proprietary Information Aastra
Setting up a ring polling connection
1. Subscriber 1 wishes to set up a connection to subscriber 2.
2. All converters are in standard operation (converter - port).
3. Subscriber 1 goes off-hook and transmits bit a in both directions of the
ring.
4. Subscriber x and subscriber 2 receive bit a and set up a port-to-port
connection.
5. The identification of the subscriber to be called is sent out in the ring.
6. Subscriber 2 detects his identification and goes off-hook.
7. Subscriber 2 identifies the a-bit received and his own busy state,
switches to standard operation and transmits his bit b in both directions
of the ring.
8. Subscriber 1 identifies the b-bit. The connection between subscriber 1
and subscriber 2 is set up.
9. All other ring subscribers are now being blocked. Listening to the
64 kbit/s information is no longer possible.
Figure 2.19: Ring polling operation
n n
Node 1
Port a
n
Node 3
14/3/5
Subs.1
Node 2
Port b Port a
Port b
Port a Port b
3/3/5
11/1
13/2/10 10/3/10 11/2/9
1/1
14/1
5/2/9
Subs.2
Subs.3