Booster amplifier and Pre-amplifier for the 'rdm' nodetype

[abhiman84]

Please refer to line numbers 2514 and 2515 in org-openroadm-device.yang.

list line-amplifier { when "/org-openroadm-device/info/node-type='ila'";

Here line-amplifier is allowed only for 'ila' node and not 'rdm'. However we would like to have booster amplifier and pre-amplifier which have the same structures as amplifier.

The 'target-tilt' and 'target-gain' of pre-amplifier and booster amplifier should be configurable for our use case. I would be grateful if I can get some leads to achieve this.

[fgruman]

@abhiman84
A history of the model development was that the ROADM models were created first, and then later the ILA models were added.

At the time when the ROADM was being modeled, it was decided that Open ROADM would support a black box view for the ROADM. The API would support the ability to set the target output power per service (this attribute appears in the roadm-connection object). The device would then determine the internal amplifier gains and tilt to achieve the channel power settings.

Please also note that at this time Open ROADM has been assuming a flat power launch model (actually constant PSD) and have not done much with tilt or pre-emphasis.

When ILAs were developed, the ILA control was agreed to be to allow for the control of the target gain and tilt. There was a debate within the forum if these should apply back to the ROADM node but it was decided to not do this and continue with the black box behavior for the ROADM. This is the reason you see the when statement you mention above.