The TDM libraries provide the following services:
The circuit switching service enables switching between any pair of timeslots on the T1/E1/J1 and H.100/H.110 interfaces. Circuit switching includes connections between:
An H.100/H.110 bus timeslot and a T1/E1/J1 timeslot.
Two H.100/H.110 timeslots.
Two T1/E1/J1 timeslots on the same or different T1/E1/J1 interfaces without using H.100/H.110 bus timeslots.
The circuit switching service enables timeslots from either T1/E1/J1 interfaces or the H.100/H.110 bus to be nailed up to communication controllers on the TX board to form individual 64, 56, or 48 kbit/s Ds0 channels. Ranges of timeslots can be grouped together to form higher bandwidth hyperchannels.
Maintaining SS7 link data integrity over hyperchannels may not be possible in certain hardware configurations. If SS7 links of greater than standard capacity are desired, then high speed links should be used. All channels of a T1, E1, or J1 trunk can be combined to form a single high speed link.
Circuit switched and nailed up timeslots can be mixed on the same T1/E1/J1 interface and on the H.100/H.110 bus. For example, a single T1/J1 interface can consist of a single timeslot nailed up to a communication controller carrying SS7 (out-of-band) signaling data (processed by the signaling software) and 23 circuit switched voice and data channels under control of an application on the host. The host application instructs the TX board to make connections between the T1/E1/J1 timeslots and the H.100/H.110 bus (or other T1/E1/J1 timeslots) based on signaling messages received on the SS7 data channel.