Msp Alarms; Operator Entered Commands - Ericsson Marconi OMS 1200 Product Description

7.4.6

MSP Alarms

There are three possible alarms, which are generated when implementing MSP
protection.
1
2
3
4
7.4.7

Operator Entered Commands

The MSP switching process also receives operator inputs. You can enter these
commands (events) via the local terminal, or from the element manager.
If the command you enter causes a change in switch state, then it is translated into a
message, which is compatible with the K1 byte message set (Siemens or ITU-T/ETSI
standard) for transmission to the remote multiplexer.
Each of the operator-entered events used for control of switching is described below.
The names of the commands are those seen at the LCT. The commands in square
brackets are the equivalent commands of the K1 message set.
These states are stored in non-volatile memory and used to restore the equipment to
its previous state in the case of a loss of power. Traffic is correctly selected from the
appropriate channel upon restoration.
Note:
Operator entered commands detailed below are:
•
•
221 02-ZAP 701 25/1 Rev C 2006-08-04
03PHB00004AAV-CUA
Tx/Rx K2 (bit 5) mismatch.
Raised if a mismatch between the transmitted and received K2 bit 5 persists
for a period of 50ms.
Tx K1 (bits 5-8), Rx K2 (bits 1-4) mismatch - ITU-T/ETSI standard protocol.
Raised if a mismatch between the transmitted K1 and received K2 persists for
a period of 50ms.
Local selected channel, Rx K2 (bits 1-4) mismatch - Siemens protocol.
Raised if a mismatch between the local selector, and the received K2 persists
for a period of 1 second (1000ms).
Local/Remote operating mode mismatch.
Raised when a mismatch between the local and remote operating modes is
detected.
For bi-directional operation, a forced switch is the only way in which the
in-traffic LED of either of a pair of single-port STM-n cards may be
extinguished. This need for your intervention is to protect against traffic
disruption in the event that the local receiving circuits of an STM-n card have
failed, but the remote system is currently selecting traffic from the (correctly
functioning) transmit circuitry of that card. This does not apply to dual-port
STM-1 cards, since the in-traffic LEDs are always lit.
Forced Switch to Worker
−
[Forced Switch (Protection Channel)}.
Forced Switch to Protection
Marconi OMS 1200
Technical Product Description
© Ericsson AB 2006
Commercial in confidence
81 (136)