Table 2. Ds3 Line Build Out Provisioning - ADTRAN Total Access OC-3 L3 Installation And Maintenance Practice

needed. The unit retains provisioning in a nonvolatile
memory device.
DS3 Line Code
DS3 Line Code is B3ZS as defined in GR-253-CORE.
DS3 Line Build Out
DS3 Line Build Out (LBO) is provisionable as shown in
Table 2.

Table 2. DS3 Line Build Out Provisioning

LBO Distance
734A/D 0 to 225 ft
735A 0 to 125 ft
734A/D 225 to 450 ft
735A 125 to 250 ft
Diagnostics
The OC-3 MUX monitors the OC-3 Section, Line, and
the STS-1 Paths for the OC-3 and DS3 #1 and DS3 #2
incoming signals. The OC-3 MUX reports the status to
the SCU for alarm processing.
Alarms
The following subsections explain the OC-3 MUX
alarms.
Loss of Signal (LOS) and Loss of Frame (LOF)
LOS or LOF detected on the incoming OC-3 signal
causes DS3 Alarm Indication Signal (AIS) to be substi-
tuted in the payloads of the two transmit DS3 signals
and DS1 AIS to be sent toward the access modules.
LOS detected on the incoming DS3 signals causes DS3
AIS to be substituted in the payload of the connected
STS-1.
LOF detected on the incoming DS3 signal, which is
dropped to the local shelf, generates a DS1 AIS toward
the access modules.
AIS
Detection of Line AIS on incoming OC-3 signal causes
DS3 AIS to be substituted in the payloads of the two
transmit DS3 signals, and DS1 AIS to be sent toward
the access modules.
Detection of Path AIS on incoming OC-3 STS-1 signal
causes DS3 AIS to be substituted in the payload or DS1
AIS sent toward the access modules, depending on the
path to which the signal is mapped.
61181031L3-5A
Detection of DS3 AIS being dropped on the local shelf
sends DS1 AIS toward the access modules.
Remote Failure Indicator (RFI)
Line and Path RFI are detected on the incoming OC-3
signal. A DS3 RFI is detected on the locally dropped
DS3 on the incoming OC-3 signal. When detected, the
OC-3 MUX reports the RFI to the SCU for status
condition reporting purposes.
The OC-3 MUX sends an RFI to the far end when it
determines there is a failure on the incoming signal.
Option
Loopbacks
Short
All loopbacks can be commanded via the OS interface.
Short
OC-3 Line Loopback
A line loopback forces the received STS-3 signal, just
Long
after optical-to-electrical conversion and CDR, to be
Long
looped back to the transmitter.
OC-3 Local Loopback
A terminal loopback forces the transmit side STS-3
signal, just before electrical-to-optical conversion, to be
looped back to the receiver.
DS3 Line Loopback
A line loopback causes the DS3 line interface device to
loop the received line data back to the network.
DS3 Local Loopback
A local loopback causes the DS3 line interface device to
loop the transmitter output data stream back to the
receiver.
DS1 Loopback
Each received DS1 going to the access modules can be
looped back to the network on an individual DS1 basis.
Front Panel Indicators
The OC-3 MUX front panel indicators are described
and illustrated in Table 3. Switch operations are
described in Table 4.
Performance Monitoring
Performance Monitoring data is collected by both the
online and the offline OC-3 MUX modules and stored
in their local volatile memory. The data can be retrieved
from either module and is not lost if a MUX failure
occurs. The OC-3 MUX provides for setting Perfor-
mance Monitoring alarm threshold and disabling
threshold alarm generation. Unmapping any STS-1/
DS3 will result in loss of Performance Monitoring data.
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