Figure 4-2 Simplified Bni-T3, Bni-E3 Block Diagram - Cisco BPX 8620 Installation And Configuration Manual

Broadband Network Interface Cards (BNI-T3 and BNI-E3)
Extracts receive timing from the input framing and makes it available for node timing. Line can
•
operate in looped timing mode.
• Recovers clock and data from the bipolar B3ZS (T3) or HDB3 (E3) line signal and converts data to
unipolar.
Figure 4-2
Some of the functions performed by the PLPP in the BNI-3T3 include:
PLPP—Receiver Side
•
–
–
–
–
–
• PLPP—Transmitter Side
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–
–
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Cisco BPX 8600 Series Installation and Configuration
4-4
Simplified BNI-T3, BNI-E3 Block Diagram
Comm.
Control
bus
& admin.
interface
processor
Network
address
table
Serial
interface
module
(SIM)
Provides frame sync for either the M23 or C-bit parity frame format.
Provides alarm detection and accumulates B3ZS code violations, framing errors, parity errors,
C-bit parity errors, and far end bit error (FEBE) events.
Detects far end alarm channel codes, yellow alarm, and loss of frame.
Provides optional cell descrambling, header check sequence (HCS) error detection, and cell
filtering.
Small receive FIFO buffer for incoming cells.
Inserts proper frame bit sequence into outgoing bit stream.
Inserts proper alarm codes to be transmitted to the far end.
Provides optional ATM cell scrambling, HCS generation and insertion, and programmable null
cell generation.
Small transmit FIFO for outgoing cells.
Queue service
engine #1
Queue service
engine #2
Queue service
engine #3
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 4 BNI (Trunk) Cards
BNI-3E3 only
G.832 framer
E3 #1
E3 xmtr/rcvr
G.832 framer
E3 #2
E3 xmtr/rcvr
G.832 framer
E3 #3
E3 xmtr/rcvr
BNI-3T3 only
DS3 function
DS3 #1
block (PLPP)
DS3 function
DS3 #2
block (PLPP)
DS3 function
DS3 #3
block (PLPP)