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The CM-5RB front panel user interface has two new groups for configuring redundancy operation. The MRDN group sets up module redundancy and the LRDN group sets up line redundancy. All

configuration items in these groups can alternatively be configured using IntraGuide GUI software, the SCM-1 SNMP proxy agent, or Intraplex Command Language (ISiCL) commands.

In CM-5RB redundancy, the backup common module controls the switching of the module and line. Therefore most module and line redundancy configuration settings are performed on the backup module, rather than the primary module. The MRDN group is accessible only on the backup common module. Also, most LRDN group elements are available only on the backup CM-5RB module. The exceptions are the FAIL and BER items; these items can be programmed separately on both the primary and backup common modules, allowing selection of different failure criteria for both primary and backup T1 lines. To access the groups, depress the group switch on the backup common module repeatedly until MRDN or LRDN appears. Table 4-22 shows the MRDN group menu items and their parameters. Table 4-23 shows the LRDN group menu items and their parameters.

Note: Both the primary and backup common modules display the items shown in the FAIL and BER groups in Table 4-22.

Table 4-11. MRDN Group Menu Functions

Group Item Description

CNFG Off Never switches modules due to module failure.

RVRT

Factory default Revertive module switching. Switches to backup module upon failure of primary module and then switches back to primary if the failure condition is cleared or if the backup module has failed.

NRVT Non-revertive module switching. Switches to backup module upon failure of primary

module and then switches back to the primary if the backup module has failed.

Exit Exit the CNFG sub-menu.

PRIM N/A Displays the usage of the primary module. If the ON/OFF indicator light is green (ON

state), the primary module is being used. If the ON/OFF light is red (OFF state), the backup module is being used.

Also, you can use this switch to manually generate a switch to the primary module by momentarily toggling the SET/NEXT switch to the UP position.

BACK N/A Displays the usage of the backup module. If the ON/OFF indicator light is green (ON

state), the backup module is being used. If the ON/OFF light is red (OFF state), the primary module is being used.

Also, this switch can be used to manually generate a switch to the backup module by momentarily toggling the SET/NEXT switch to the UP position.

LINE Same

Factory default

If Same, this function switches to the backup module and backup line upon a primary module failure (same type T1 facility for primary and backup lines).

Diff If Diff, switch to the backup module and backup line upon a primary module failure

(different type T1 facility for primary and backup lines).

Note that the exception to the above rule is if line redundancy mode LRDN = NOBK (no backup line). If LRDN = NOBK, a primary module failure results in a switch to primary line.

If Framing Type (SF versus ESF) is different for the two lines, selection must be “Diff.”

If the line code is different (AMI versus B8ZS), a Diff setting is recommended. If TLBO (Transmit Line Buildout) setting differs by more than 7 dB between primary and backup, a Diff setting is recommended.

Table 4-12. LRDN Group Menu Functions

Group Item Description

CNFG Off Never switch lines due to line failure.

RVRT RVRT – Revertive switching – Switches to backup line upon failure of primary

line and then switches back to primary line if primary line becomes “better” than the backup line or if both the primary and backup lines are good.

NRVT NRVRT – Non-revertive switching – Switches to backup line upon failure of

primary line and then switch back to the primary line if the primary line becomes “better” than the backup line.

NOBK

Factory default

No backup line – Notifies controlling common module that no backup line is available. In this condition, module only redundancy is implemented if the primary line fails, the CM-5RB modules do not switch to the backup line. Also, shelf alerts and alarms are not generated based on the backup line condition.

Exit Exit the CNFG sub-menu.

PRIM N/A Displays the use of the primary line. If the ON/OFF indicator light is green (ON

state), the primary line is being used. If the ON/OFF light is red (OFF state), the backup line is being used.

You can also use this item to manually generate a switch to the primary line by momentarily toggling the SET/NEXT switch to the UP position.

Table 4-12. LRDN Group Menu Functions (continued)

Group Item Description

BACK N/A Displays the use of the backup line. If the indicator light is green (ON state),

the backup line is being used. If the light is red (OFF state), the primary line is being used.

You can also use this item to manually generate a switch to the backup line by momentarily toggling the SET/NEXT switch to the UP position.

SDLY 0 S Line redundancy failure integration time of 0 seconds.

0.5 Line redundancy failure integration time of 0.5 seconds.

1 S

Factory default

Line redundancy failure integration time of 1 second.

10 S Line redundancy failure integration time of 10 seconds.

Exit Exit the SDLY sub-menu.

RDLY 10 S

Factory default

Line redundancy reversion switch delay of 10 seconds.

1min Line redundancy reversion switch delay of 1 minute.

5min Line redundancy reversion switch delay of 5 minutes.

Exit Exit the RDLY sub-menu.

FAIL (configure on both primary and backup CMs) LOS On/Off Factory default is on

Line failure criteria – Loss of signal (LOS) – Line failure is declared if receiving LOS. Loss of signal is the absence of pulses lasting for one millisecond or more.

OOF On/Off

Factory default is on

Line failure criteria. Out of frame (OOF). Line failure is declared if receiving OOF.

AIS On/Off

Factory default is on

Line failure criteria. Alarm Indication Signal (AIS). Line failure is declared if receiving AIS.

UAS On/Off

Factory default is off

Line failure criteria based on an Unavailable Seconds (UAS) count. Line failure is declared if line is in Unavailable Signal State (ten consecutive Severely Errored Seconds). UAS is available in T1 ESF (Extended Superframe) only. YEL

On/Off

Factory default is off

Line failure criteria, Yellow alarm (T1), Line failure is declared if receiving Yellow alarm (T1).

Exit Exit the FAIL sub-menu.

BER (configure on both primary and backup CMs) Off Factory default

Line failure criteria – Excessive Bit Error Rate. Line failure is declared if BER exceeds user defined threshold.

10^3 1 x 10-3 Bit Error Rate (BER) threshold

10^4 1 x 10-4 Bit Error Rate (BER) threshold

10^5 1 x 10-5 Bit Error Rate (BER) threshold

10^6 1 x 10-6 Bit Error Rate (BER) threshold

Section 5 – Remote Control Operation

This section discusses multiplexer physical connections for remote control and various ways you can remotely configure and operate an ACS-160 Series or STL-160 Series multiplexer. You can physically connect your multiplexer in one of three ways:

● A serial cable connection to the shelf via the remote port (Section 5.1.1) ● DS0 management communication (Section 5.1.2)

● An SCM-IP module and an MA-440 module adapter connecting to an IP network (Section 5.1.3) Likewise, you can use one of these interfaces to configure and operate the multiplexer:

● IntraGuide Configuration and Management Software (all three connections – Section 5.2.1) ● SNMP via the SCM-IP module (third connection – Section 5.2.2)

● Intraplex Simple Command Language (ISiCL – first two connections – Section 5.2.3)