User guide

August 2001 175
Switching Calls through the MVIP-90 Bus
Connecting Line Resources
When you connect resources from two boards with switching
capability in a full-duplex connection, you connect the internal
resource on one board to the internal resource on another board
using an intermediate MVIP stream. These types of connections
are called drop and insert. You drop a call from one internal
resource onto an unused MVIP timeslot, then you insert that
call into an internal resource on the second board.
One example of a drop and insert connection is when you call a
call center such as a mail order center. Your call reaches the call
center through one of their inbound lines (through a T1 line, for
example). The T1 board connects your call to a VP resource on
another board. The system prompts you to enter information
such as zip code, social security number, or customer number,
then places your call on hold. When a customer representative
is available, the T1 board switches your call to a timeslot on the
MVIP bus. Another board, such as an RTNI-ATSI switches the
call from the MVIP bus to an outbound line to the customer
representative. In this scenario, your call is connected through
the MVIP bus to an outbound line on another board.
When you perform a drop and insert, one board uses the stream
in the reverse direction. For example, Figure 32 shows what
would happen if two RTNI boards transmitted data on a DSix
stream and received data on a DSox stream (the conventional
direction). Since both boards place data on DSi0, neither
receives data from the other board.
Figure 32. Two Boards Transmitting on the Same Stream
Trunk 0
Local Stream 16
RTNI-2T1
RTNI ATSI
DSi0
DSo0
External
Lines
(0, 0)
(, 0) 16
() 16, 0
(0, 0)
Local Stream 16
(0, 0)
(16, ) 3
(16, 3)
(0, 0)