5.4.3. Using Time Slot 16 on Intel® Dialogic E-1 Network Interface Boards

Traditionally, E-1 trunks reserve physical time slot 16 for signaling, which is designated as dtiB#T31, where # is the logical number of the trunk. With SS7 however, signaling is on a different physical trunk than the telephony circuits. The signalling time slots can then be used for a normal voice circuit.

With Intel® Dialogic E-1 network interface boards, setting time slot 16 to the "clear channel" mode requires that special ISDN firmware to be downloaded to the board and that ISDN D channel be disabled. For Springware boards, this can be done using the CTR4 (ISCTR4 v6.65) firmware for example and by changing parameter 16 in the CTR4.PRM parameter file to 2. For DM3 boards, the special _TS16 firmware should be used.

Similarly, if an SS7 link is routed from time slot 16 of an Intel® Dialogic E-1 network interface board to an Intel® NetStructure™ SS7 board, the Intel® Dialogic board must leave time slot 16 in clear channel mode, as described.

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