Specifications

7-66
Reference Guide
Model No.
Running Head
PARS Screen WAN Card
7.5.1 Implementation of PARS
There are certain rules and guidelines to follow when PARS is implemented.
1. WAN should be empty (termination or time slot assignments) in order to turn PARS
ON or Off.
2. As soon as PARS is selected on WAN #n, Wn-1 becomes primary and Wn-2 becomes
secondary.
3. All primary time slots will be cross-connected to the secondary WAN.
4. Once a primary WAN is assigned to PARS mode, the secondary WAN will be assigned
to PARS by the system and will not be available to the user. Nothing can be terminated
on a secondary WAN after PARS MODE is selected.
5. Physical connections are always made from the secondary WAN to the primary WAN
of the adjacent node.
6. User cards will be terminated normally on the primary WAN.
7. Upon termination on the primary WAN, user cards will actually be split so that they are
terminated on RX of one WAN and TX of the other.
8. WAN will work as usual until CGA-RED or CGA-YELLOW is detected. The TX and
RX of empty time slots will be cross-connected to themselves. User cards will be
cross-connected to the WAN with the unbroken link and their split termination between
the two WANs will be removed.