Specifications

X723-300151 1-2 Issue 2
interface when fitted in Port 1 or Port 2. (A separate manual contains
information on the Dual LIU operating as a Smart card.)
The Dual LIU works in conjunction with a G.703 I/O (75R or 120R)
adaptor to provide interfaces to two G.703/G.704 line signals with optional
bypass facilities. A G.703 synchronisation port is also provided.
The G.703 I/O adaptors used with the Dual LIU provide the option of
supporting a PCM and clock bypass. This is used to link the two line
signals in the event of a power failure or a fault in the 3200.
The 3200 chassis may be equipped with up to fifteen channel cards,
however two of these positions are generally used for Dual LIUs.
Channel cards are used to interface to 64kbit/s data circuits or voice
circuits. A variety of channel cards are available including 2/4 wire voice
cards V.11, V.35, X.21, Nx64k and RS-232 interfaces. Each channel card
circuit can be assigned to any timeslot, and cross-connected to any other
timeslot. Additional PCM interface cards are available for the connection
of tributary PCM streams. All channel cards for the 3200 are fully
interchangeable with other Series 3000 products and Series 2000 with a
few operation restrictions in some cases.
The 3200 is divided into four sections called ports 1, 2, 3 and 4. Each port
can be cross-connected to any other port. Ports 1 and 2 each have one
physical card slot, and 3 x 32 timeslot backplane busses allocated to them.
In Port 1 these backplane streams are referred to as P1, S1 and S2 for
configuration purposes. In Port 2 these backplane streams are referred to
as P2, S3 and S4 for configuration purposes. When a Dual LIU or Dual
Nx64Kbit/s card is inserted in to Port 1 or Port 2, they automatically use
S1, S2 or S3, S4 busses in Port 1 and 2 respectively. This allows access for
cross-connection on the system controller of all 4 x 31 timeslots of 4 x
2Mbit/s PCM stream when a Dual LIU is fitted in Port 1 and 2 for
example. When standard channel cards are fitted in Port 1 and Port 2,
they automatically use P1 or P2 busses in Port 1 and Port 2 respectively.
In this case, they have 32 timeslots available for cross connection at the
system controller.
Port 3 has seven physical card slots in a 3200. Port 3 has 1 x 32 timeslot
backplane bus allocated to it which is referred to as P3 for configuration
purposes.
Port 4 has six physical card slots. Port 4 in all chassis has 1 x 32 timeslot
backplane bus allocated to it which is referred to as P4 for configuration
purposes.