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Chapter 6. Configuration
61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual 59
V.110
The V.110 protocol is a CCITT compliant rate adaptation method
providing DTE service between the ISU 2x64 Dual Port ISDN Ser-
vice Unit and other V.110 compliant devices. The V.110 protocol
supports both synchronous and asynchronous DTE rates. See the
section Recommended Operating Modes and Table 1-B for available
V.110 rates. Figure 6-21 illustrates the menu path for selecting
V.110.
DSU 57.6 ASYNC
The DSU 57.6 ASYNC protocol allows the ISU 2x64 to communi-
cate asynchronously at 57.6 kbps with ADTRAN 2-and 4-wire
Switched 56 DSU products. In addition, the ISU 2x64 communi-
cates with other ISUs over dial and leased connections using this
protocol. Figure 6-21 illustrates the menu path for selecting DSU
57.6 ASYNC.
T-Link
The T-Link protocol allows the ISU 2x64 to communicate with 2-
wire Switched 56 DataPath DUs. The T-Link protocol performs
two functions:
• It adapts the data rate of sub 64 kbps DTE devices to the 64
kbps bandwidth of the ISDN bearer channel.
• For asynchronous and synchronous DTE rates up to 19.2
kbps, T-Link transmits the status of the DCE-DTE EIA leads
to facilitate flow control and maintenance.
In addition to 2-wire Switched 56 DataPath DUs, the ISU 2x64
communicates with any other device using the T-Link protocol.
Figure 6-21 illustrates the menu path for selecting T-Link.
SAP
The Simple ADTRAN Protocol (SAP) is a rate adaptation method
which provides DTE service between ISU 2x64 units at a channel
rate lower than the 64 kbps ISDN bearer. Selecting this menu
item causes the ISU 2x64 to use SAP protocol.