Harris ACS-163, Руководство по установке и эксплуатации

Страница: 35 / 178

2 – Functional Description ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation
Version 2.11, August 2011
Harris Corporation 2-13
Intraplex Products
module configuration data has been downloaded to the primary module. The configuration data
downloads automatically when a working module is installed.
The replacement primary common module should be pre-configured before installation. Before
reversion occurs, channel module configuration data is automatically downloaded from the backup CM-
5RB module to the replacement primary CM-5RB module. During this download process, the word
“WAIT” is displayed on the front panel of the backup CM. Reversion to the primary CM can be
manually forced either from the front panel switches or via ISiCL even if automatic reversion is
disabled.
2.1.4.6 Line Failure Detection and Switching
A switch from the primary T1 line to the backup T1 line is initiated by the equipment upon detection of
line failure conditions. Table 2-3 shows the available line failure conditions and their types. You can
either enable or disable each condition.
Table 2-3. Line Failure Conditions
Line Failure Conditions Failure Type
Loss of Frame (OOF or LOF) Hard Failure
Loss of Signal (LOS) Hard Failure
Alarm Indication Signal (AIS) Hard Failure
Excessive Bit Error Rate (BER) for T1 ESF (Extended Superframe).
Programmable thresholds are 10
-3
, 10
-4
, 10
-5
, or 10
-6
*
Soft Failure
Excessive Bit Error Rate (BER) for T1 SF (Superframe). Threshold is: 10 -3 * Soft Failure
Unavailable Signal State (UAS)* Soft Failure
Remote Alarm Indication Signal (RAIS or Yellow) Soft Failure
* When operating in AEC mode (Section 2.1.4.11 – Module or Line Redundancy Alarms and Alerts ),
Unavailable Signal State (UAS) is declared after 10 consecutive Severely Errored Seconds (SES) and
cleared after 10 error-free seconds, where an SES is defined as a second with 101 or more errors. For
Standard (non-FTI) mode, UAS is declared after 10 consecutive SES and cleared after 10 consecutive
non-SES, where an SES is a second with 320 or more errors.
Intraplex equipment monitors the performance of both the primary and backup T1 lines and assigns a
type code to it:
● Good
● Soft Fail
● Hard Fail
Good condition is preferable to Soft Fail condition. Accordingly, Soft Fail is better than Hard Fail. When
a switch in line occurs, both the backup CM-5RB module and MA-235 module adapter become active
(Figure 2-10).