DS2156L+ Maxim Integrated Products, DS2156L+ Datasheet - Page 83
![IC TXRX T1/E1/J1 1-CHIP 100-LQFP](/photos/6/82/68291/406-100-lqfp_sml.jpg)
DS2156L+
Manufacturer Part Number
DS2156L+
Description
IC TXRX T1/E1/J1 1-CHIP 100-LQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2156L.pdf
(265 pages)
Specifications of DS2156L+
Function
Single-Chip Transceiver
Interface
E1, J1, T1, TDM, UTOPIA II
Number Of Circuits
1
Voltage - Supply
3.14 V ~ 3.47 V
Current - Supply
75mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
100-LQFP
Includes
BERT Generator and Detector, CMI Coder and Decoder, HDLC Controller
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
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13.1 Line-Code Violation Count Register (LCVCR)
13.1.1
T1 code violations are defined as bipolar violations (BPVs) or excessive 0s. If the B8ZS mode is set for
the receive side, then B8ZS codewords are not counted. This counter is always enabled; it is not disabled
during receive loss-of-synchronization (RLOS = 1) conditions. Table 13-A shows what the LCVCRs
count.
Table 13-A. T1 Line Code Violation Counting Options
13.1.2
Either bipolar violations or code violations can be counted. Bipolar violations are defined as consecutive
marks of the same polarity. In this mode, if the HDB3 mode is set for the receive side, then HDB3
codewords are not counted as BPVs. If ERCNT.3 is set, then the LVC counts code violations as defined
in ITU O.161. Code violations are defined as consecutive bipolar violations of the same polarity. In most
applications, the framer should be programmed to count BPVs when receiving AMI code and to count
CVs when receiving HDB3 code. This counter increments at all times and is not disabled by loss-of-sync
conditions. The counter saturates at 65,535 and does not roll over. The bit-error rate on an E1 line would
have to be greater than 10
Table 13-B. E1 Line-Code Violation Counting Options
COUNT EXCESSIVE
E1 CODE VIOLATION SELECT
(ERCNT.0)
ZEROS?
E1 Operation
T1 Operation
Yes
Yes
No
No
(ERCNT.3)
0
1
-2
before the VCR would saturate (Table 13-B).
B8ZS ENABLED?
(T1RCR2.5)
Yes
Yes
No
No
COUNTED IN THE LCVCRs
83 of 265
BPVs
BPVs + 16 consecutive 0s
BPVs (B8ZS codewords not counted)
BPVs + 8 consecutive 0s
COUNTED IN THE LCVCRs
BPVs
CVs
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