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HighWire HW400c/2 User Reference Guide Rev 1.0
3.3 Computer Telephony Bus Controller
The HW400c/2 includes the Agere T8110L CT Bus Controller to control TDM bus
switching between the backplane (CompactPCI J4 connector) and the local bus,
which is connected to the JN3 connector on each of the two PTMC sites.
3.3.1 H.110 Interface (T8110L)
The Agere T8110L is a H.110 CT Bus controller that provides a complete interface
between the backplane H.110 CT bus and local PTMC CT bus through a dynamically
controllable switching fabric. The H.110 interface connects to all 32 bi-directional
TDM streams of the backplane H.110 bus via the CPCI J4 connector using the
PICMG 2.5 R1.0 standard mapping. It can access any of the 4096 time slots carried
on the H.110 bus.
The local CT bus, with 32 bi-directional TDM connections, can be programmed for
data rates of 2.048Mb/s, 4.092Mb/s or 8.192Mb/s. The local CT bus of the T8110L
is connected to each of the PTMC sites via the JN3 connectors.
The PTMC configuration 2 (PT2MC) type modules only support 20 CT bus streams, while PTMC
configuration 5 (PT5MC) modules support all 32 CT bus streams.
3.3.2 T8110L Clocking Interface (T8110L)
The T8110L LSC [3:0] output pins are connected to the PTMC Output Clock Drivers
located in the CPLD. The LSC[3:0] pins are programmed as shown in Table 6.
Table 12. LSC Assignments
LSC output Signal Assignment
LSC0 CT_C8
LSC1 CT Frame
LSC2 NETREF1
LSC3 NETREF2
Figure 10 shows the local CT Bus clocking signals and how they are routed.
October 10, 2006 Copyright 2006, SBE, Inc. Page 25