Chapter 6. Configuration61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 59V.110The V.110 protocol is a CCITT compliant rate adaptation methodproviding DTE service between the ISU 2x64 Dual Port ISDN Ser-vice Unit and other V.110 compliant devices. The V.110 protocolsupports both synchronous and asynchronous DTE rates. See thesection Recommended Operating Modes and Table 1-B for availableV.110 rates. Figure 6-21 illustrates the menu path for selectingV.110.DSU 57.6 ASYNCThe DSU 57.6 ASYNC protocol allows the ISU 2x64 to communi-cate asynchronously at 57.6 kbps with ADTRAN 2-and 4-wireSwitched 56 DSU products. In addition, the ISU 2x64 communi-cates with other ISUs over dial and leased connections using thisprotocol. Figure 6-21 illustrates the menu path for selecting DSU57.6 ASYNC.T-LinkThe T-Link protocol allows the ISU 2x64 to communicate with 2-wire Switched 56 DataPath DUs. The T-Link protocol performstwo functions:• It adapts the data rate of sub 64 kbps DTE devices to the 64kbps bandwidth of the ISDN bearer channel.• For asynchronous and synchronous DTE rates up to 19.2kbps, T-Link transmits the status of the DCE-DTE EIA leadsto facilitate flow control and maintenance.In addition to 2-wire Switched 56 DataPath DUs, the ISU 2x64communicates with any other device using the T-Link protocol.Figure 6-21 illustrates the menu path for selecting T-Link.SAPThe Simple ADTRAN Protocol (SAP) is a rate adaptation methodwhich provides DTE service between ISU 2x64 units at a channelrate lower than the 64 kbps ISDN bearer. Selecting this menuitem causes the ISU 2x64 to use SAP protocol.
