Datasheet

DS2155
15 of 238
3.2 Block Diagram
Figure 3-1 shows a simplified block diagram featuring the major components of the DS2155. Details are
shown in subsequent figures. The block diagram is divided into three functional blocks: LIU, FRAMER,
and BACKPLANE INTERFACE.
Figure 3-1. Block Diagram
TX
LIU
CLOCK
ADAPTER
BACKPLANE
INTERFACE
CIRCUIT
HOST INTERFACE
T1/E1/J1 NETWORK
CLOCK
JTAG ESIB
RX
LIU
JITTER ATTENUATOR
LOCAL LOOPBACK
REMOTE LOOPBACK
FRAMER LOOPBACK
PAYLOAD LOOPBACK
MUX
MUX
EXTERNAL ACCESS
TO RECEIVE SIGNALS
EXTERNAL ACCESS
TO TRANSMIT SIGNALS
BACKPLANE
BACKPLANE
CLOCK SYNTH
LIU
FRAMER BACKPLANE
INTERFACE
SYNC
HDLCs
SINGALING
ALARM DET
FRAMER
CRC GEN
SINGALING
ALARM GEN
HDLCs
HDB3 / B8ZS
HDB3 / B8ZS