Part Number: BRI-2UST (2 Port BRI-S/T-U ISDN Simulator)

2 Port ISDN Simulator has two ports, each port has two interfaces U and S/T.
On each port only one interface type can be used at a time.
It allows to connect only two devices with ISDN BRI ports.
Possible combinations: S/T + S/T, S/T + U, U + S/T, U + U

Part Number: BRI-2ST (2 Port BRI-S/T ISDN Simulator)

2 Port BRI-S/T ISDN Simulator has two ports, each port has only S/T interface type.
It allows to connect only two devices with ISDN BRI S/T ports.
Possible combinations: S/T + S/T

Part Number: BRI-2U2ST ( 4 Port BRI-S/T-U ISDN Simulator )

4 Port ISDN Simulator has 4 ports, allowing to connected 4 ISDN BRI devices at the same time.
2 ports has only S/T interface, another 2 ports has only U interface.
Possible combinations: U + S/T + U + S/T

All these products share the same exterior appearance and internal hardware.
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