Applicable to credit default swaps on mortgage backed securities to specify whether payment delays are applicable to the fixed amount.
Residential mortgage backed securities typically have a payment delay of 5 days between the coupon date of the reference obligation and the payment date of the synthetic swap.
Commercial mortage backed securities do not typically have a payment delay, with both payment dates (the coupon date of the reference obligation and the payment date of the synthetic swap) being on the 25th of each month.