Product Overview
950-734-100-01, Revision 01
4
December 18, 1998
PLL-734 List 1
Maximum Power Consumption
The maximum power consumption is the total power that the COLU consumes or draws from its -48 Vdc COTS
power source. This parameter is needed when the COLU is located remotely from its serving CO. It determines
the battery capacity required to maintain an 8-hour standby battery reserve for emergency situations. This limits
the maximum number of line units in an RT.
Maximum Current Drain
The maximum current drain is the maximum current drawn from the COTS power supply when it is at its
minimum voltage (-42.5 Vdc). This determines the COTS fusing requirements.
M
ONITORING
, H
ISTORY
AND
D
IAGNOSTICS
COLUs provide extensive real-time, nondisruptive monitoring of HDSL transmission performance parameters for
all units in a circuit. You can select threshold settings for the performance monitoring measurements at the
appropriate COLU screen. These settings cause alarms to be activated at the designated threshold setting. The user
interface ports performance is also monitored. Monitored parameters include the following:
•
HDSL
Noise margin, insertion loss, ES, UAS
•
Interface
ES and UAS seconds
•
Major Alarm Relay
Form-C relay contacts (NO, NC, C). Fail-safe operation
Performance Parameters
Based on the monitored parameters, the COLUs derive the following performance parameters:
•
MAR
A measure of the ratio of signal power to noise power, in decibels (dB), at a receiver point. A
value of 0 dB means that the predicted transmission BER is equal to 10
-7
, a value of 6 dB means
the predicted transmission BER is equal to 10
-10
. The Main menu status display of the console
continuously updates the margin value. You can set the high and low values of this parameter
for the COLU and the RT at the
“HDSL Summary Screen” on page 17
and the severity of the
alarm at the
“System Alarm Types Screen” on page 25
. View the results of these settings at the
“COLU Summary Screen.”
•
LOSW
The COLU has detected an error in one or more bits in five consecutive HDSL SYNC words.
Five consecutive SYNC words must be received without error to clear this condition. A LOSW
condition generally indicates the loop is down, thus data cannot be transmitted. The COLU uses
this parameter to derive UAS performance parameter. You can set the severity of the alarm at
the
“HDSL Alarm Types Screen” on page 28
. View the results of these settings at the
“HDSL
Summary Screen” on page 17
.
•
HDSL ES
An interval of 1 second during which at least one CRC is detected at the incoming HDSL port.
You can set the value of this parameter for the COLU and the RT at the
“HDSL Alarm
Thresholds Screen” on page 27
and at the
“HDSL Alarm Types Screen” on page 28
set the
severity of the alarm. View the results of these settings at the
“HDSL Summary Screen” on
page 17
.
•
HDSL UAS An interval of 1 second during which a loop is down. You can set the value of this parameter
for the COLU and the RT at the
“HDSL Alarm Thresholds Screen” on page 27
and at the
“HDSL Alarm Types Screen” on page 28
set the severity of the alarm. View the results of these
settings at the
“HDSL Summary Screen” on page 17
.