Multiplexer Controller Restoration; Protection Switch Time And K1, K2 Protocol Timing - Ericsson Marconi OMS 1200 Product Description

Deconfiguring MSP sets protection switching to the disabled state for the selected
port. Disabling protection automatically clears any switch commands you entered and
cause traffic to revert to the working channel 1. It also sets the transmitted K1 byte
indication to No Request (#0) and transmitted K2 bits 1-4 indicate channel 0.
7.4.20

Multiplexer Controller Restoration

The Multiplexer Controller is capable of interrogating the core or core unit replacement
for current settings for protection to ensure that on controller re-set, states are not
changed.
7.4.21

Protection Switch Time and K1, K2 Protocol Timing

When using the ITU-T/ETSI standard protocol, the overall protection switch time for a
MSP event is less than 50 ms for both unidirectional and bi-directional modes of
operation.
When using the Siemens protocol (bi-directional only), bi-directional switching is
completed within 1 second (1000ms).
For unidirectional mode, (ITU-T/ETSI standard) this time is defined as the period
between an SF or SD flag being set by an STM-n card and completion of the switching
action (this includes the operation of the local tail-end selector as well as the
transmitted K1, K2 bytes stabilising to a steady state).
In bi-directional operation, when using the ITU-T/ETSI standard protocol, the switching
time is as for unidirectional operation except that the time includes multiplexers at both
end of the multiplexer section (i.e. the time is for overall switching of the multiplexer
section in both directions of transmission).
When using the Siemens protocol, this time includes the time-out period of 1 second
(1000ms) in which the received K2 must match the selected channel.
The overall protection switch time for a manually initiated switch is less than 8
seconds. The time is defined as the period from the entry of the protection switch
command at the local terminal to the confirmation output from the local-terminal to the
operator.
When an SMA is configured to operate in bi-directional mode, the appropriate K2
(bridged channel - ITU-T/ETSI) indication (bits 1-4) is transmitted within 50 ms of a
bridging request being received in the K1 byte from the remote multiplexer. A bridging
request is any valid K1 byte. Bits 5-8 indicate the channel for which the bridge is
requested.
When using the Siemens protocol, the appropriate K2 (selected channel) indication is
transmitted within 1 second of a request being received in the K1 byte of the remote
multiplexer.
221 02-ZAP 701 25/1 Rev C 2006-08-04
03PHB00004AAV-CUA
The configuration of the Wait To Restore period must be in the range of 0 to
30 minutes (refer to Section 7.4.17.1). WTR is individually configurable for
each worker/protection pair or globally for all pairs.
Marconi OMS 1200
Technical Product Description
© Ericsson AB 2006
Commercial in confidence
88 (136)