tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 546

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
22 Cross Connect (XC) Block Functional Description
The cross connect can functionally be divided into three major sections: XC1 for DS1(E1), XC2 for DS2, and XC3
for DS3. Each section can be configured to establish interconnects between major functional blocks or connect
blocks to external I/O to establish an application. The DS1 and DS2 cross connects can establish the order of the
circuits to be multiplexed and demultiplexed in the transmission hierarchy. In addition, a programmable MUX is pro-
vided for selecting the path overhead access channel connection.
Literally hundreds of signals are interconnected. The cross connect is designed to simplify the configuration by
defining a set of sources and destinations. Signals such as data, clock, alarm, and control associated with an iden-
tified source and destination are bundled to simplify the cross connect configuration. Establishing a connection in
the configuration registers will interconnect the source group of signals to the destination group of signals.
It is important to note that the configuration information is not shared between major blocks. For example, a virtual
tributary is interconnected between the VT mapper and the framer. The cross connect can establish the intercon-
nect for data and clock and intelligently establish the proper interconnects for alarms and control. The framer block
and VT mapper are required to be properly configured for operation as a DS1 or E1 and selection of clock edge to
properly sample the data.
A brief overview of the framer block and the device external I/O pins is useful prior to a detailed description of the
cross connect block.
22.3.1 Framer to Cross Connect Overview
The framer block interface to the cross connect is subdivided into six defined interfaces for each of the 28 framers
as shown in
FRM_TP_T, FRM_TP_R—Transmit and receive interfaces for the framer transmit path (TP).
FRM_RP_T, FRM_RP_R—Transmit and receive interfaces for the framer receive path (RP).
FRM_RS—Framer receive system interface (RS).
FRM_TS—Framer transmit system interface (TS).
Note: The receive system interface is associated with the transmit path and the transmit system interface is asso-
546
ciated with the receive path. The system interface definitions have been assigned based on historical con-
vention.
CONNECT
CROSS
Figure
82. A brief explanation follows for establishing path and interconnect definition.
FRM_RP_R
FRM_TP_T
TRANSMIT PATH
RECEIVE PATH
FORMATTER
RP FRAME
ALIGNER
TP FRAME
Figure 82. Framer and Cross Connect
FORMATTER
RP FRAME
TP FRAME
TRANSMIT
RECEIVE
ALIGNER
SYSTEM
SYSTEM
(continued)
FRM_TP_R
FRM_RP_T
FRM_RS
FRM_TS
Agere Systems Inc.
CONNECT
CROSS
May 2001
5-9181(F)