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: d. Maximum layer 2 idle time before connection verification is necessary (T203). 12.4.3.5.9 Timer T203 Timer T203 is used to time periods of inactivity on a data link. When T203 expires, a supervisory frame with the poll bit set to 1 is sent to determine if the other side of the interface is capable of sending and receiving frames. The use of T203 is discussed in greater detail in Section 12.6.3.3. R12-19 [891] For all SAPS, the value of T203 shall be user selectable within the range of 10 to 300 seconds, inclusive, the step size shall be 10 seconds, and the default value shall be 30 seconds. Units in seconds.