Rainbow Electronics DS2182A User Manual
Rainbow Electronics Communication
E
Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
DS2182A
T1 Line Monitor
DS218A
041995 1/22
FEATURES
•
Performs framing and monitoring functions
•
Supports Superframe and Extended Superframe
formats
•
Four onboard error counters
– 16-bit bipolar violation
– 8-bit CRC
– 8-bit OOF
– 8-bit frame bit error
•
Indication of the following
– yellow and blue alarms
– incoming B8ZS code words
– 8 and 16 zero strings
– change of frame alignment
– loss of sync
– carrier loss
•
Simple serial interface used for configuration, control
and status monitoring
•
Burst mode allows quick access to counters for status
updates
•
Automatic counter reset feature
•
Single 5V supply; low-power CMOS technology
•
Available in 28-pin DIP and 28-pin PLCC
•
The DS2182A is upward-compatible from the original
DS2182
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
28-Pin DIP (600 MIL)
25
26
27
28
INT
SDI
SDO
CS
SCLK
NC
RYEL
RLINK
RLCLK
RCLK
RCHCLK
RSER
NC
VSS
VDD
RLOS
RFER
RBV
RCL
RNEG
RPOS
RST
TEST
RSIGSEL
RSIGFR
RABCD
RMSYNC
RFSYNC
The updated DS2182A includes the following changes
from the original DS2182:
•
ability to count excessive zeros
•
Severely Errored Framing Event indication
•
updated AIS detection
•
updated RCL detection
•
AIS and RCL alarm clear indications
DESCRIPTION
The DS2182A T1 Line Monitor Chip is a monolithic
CMOS device designed to monitor real-time perform-
ance on T1 lines. The DS2182A frames to the data on
the line, counts errors, and supplies detailed informa-
tion about the status and condition of the line. Large on-
board counters allow the accumulation of errors for ex-
tended periods, which permits a single CPU to monitor a
number of T1 lines. Output clocks that are synchronized
to the incoming data stream are provided for easy ex-
traction of S-Bits, FDL bits, signaling bits, and channel
data. The DS2182A meets the requirements of ANSI
T1.231.