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Description
P0914209
Standard 3.00
April 2000
As long as the digital set is off-hook, it retains the time slot. An MCR user
may place a call on hold, make a second call, and switch between calls.
However, the call on hold is not occupying a time slot. If the user places the
digital set on-hook while there is still a call on hold, the time slot is lost, but
not the call. To re-establish the call, another time slot must be available. If the
MCR user tries to access the call that was placed on hold while no time slots
are available, the user will receive re-order but the call will remain on hold.
After receiving re-order, the user may place the call back on hold and try
again for a time slot. This may be repeated until a time slot is available or the
caller hangs up.
Blocking
With the number of TN’s greater than the number of T1 channels, calls
between the remoted line card and the switch may be blocked due to the lack
of an available time slot. Normally, all signaling messages between the RMI
and the switch are passed through the MCR system, but not during blocked
situations.
Analog cards and digital cards handle blocking differently. For analog sets,
ringing messages destined for a remoted line card are dropped when a
time-slot allocation is attempted but a time slot is not available. This enables
the caller to be forwarded to voice mail when no time slots are available.
Also, when no time slots are available, off-hook messages from the remoted
phones are not transported across the MCR. Instead, the remote user receives
re-order, or fast-busy (a fast busy signal) to indicate that no time slot is
available.
With digital sets, ringing messages are not dropped when no time slots are
available. If the user answers a ringing telephone when no time slots are
available, the user receives a re-order signal to indicate the blocked situation.
The caller will hear silence, since the MCR system is out of time slots.
CardLAN
The local LMI and LMX act as a cardLAN slave to the XPEC or Option 11
CPU card. The RMI board sits in the Option 11 CPU slot and therefore is the
cardLAN master. The local boards wait for the RMI to enable them to
respond to their cardLAN master. The RMI polls all 10 line card slots at the
remote site in a round-robin fashion and looks for newly inserted cards.