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Introduction 28
Model 3088 Series User Manual 2 • Configuration
X.21 operation. There are a few things to note about clock modes and X.21 operation.
- One X.21 modem must be set to Receive-Recover. The other X.21 modem must be set to either Internal or
External/Network clock mode.
- The X.21 modem that is configured as Receive-Recover must be DCE.
- The X.21 modem that is configured as Internal must also be DCE, but if it is an External/Network clock,
then the modem must be configured as DTE.
S2-6: DTE Loops (RocketLink-G models 3088/CA only)
The V.35 interface provides two pins, one to request an LAL and the other to request an RDL. If DTE loops
are enabled, the 3088/CA will start a local loopback or a remote loopback when these pins are asserted. If DTE
loops are disabled, these requests will be ignored.
Table 10. X.21 Clocking
CPE-Side Modem CO-Side Modem
Modem’s
X.21
Orientation
Receive-Recover Internal External/Network
DCE DCE x
DCE x DTE
Table 11. S2-6 V.35 Loopback settings
S2-6 Setting
ON Enabled
OFF Disabled