R5-97 [339] For each data link service access point (i.e., each SAPI=0 and SAPI=1, for both the active and standby data links, per IG), an RDT and an IDT shall receive from a remote managing system and process assignment and retrieval of the following LAPD parameters for the purpose of remote provisioning the layer 2 connection: c. Maximum layer 2 wait time for an acknowledgment of a transmitted frame (T200) 12.4.3.5.6 Timer T200 Timer T200 specifies the waiting period for receipt of an acknowledgment of a transmitted frame. A study of LAPD suggests that T200 should be at least as great as the time required to transmit three information frames. (See IEEE Publication CH2175-8/85/0000-0121.) Therefore, to protect against timeouts in an error-free condition, the default value of T200 for each SAP is sufficient to allow for the transmission of at least three frames. R12-18 [890] For all SAPs, the value of T200 shall be user selectable within the range of 100 ms to 350 ms, inclusive, the step size shall be 50 ms, and the default value of T200 shall be 150 ms. Units in milliseconds.