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Introduction 26
Model 3088A Series Getting Started Guide 2 • Configuration
DCE/DTE operation
Note
This section applies to the following 3088A models:
- 3088A/A - RS-232
- 3088A/CA - V.35
- 3088A/D - X.21
There are a few things to note about clock modes and the 3088A sync serial interface.
- One 3088A must be set to Receive-Recover. The other 3088A must be set to either Internal or External/
Network clock mode.
- The 3088A that is configured as Receive-Recover must be DCE.
- The 3088A 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.
ON OFF OFF OFF ON ON ON 4672
ON OFF OFF ON OFF OFF OFF 4736
ON OFF OFF ON OFF OFF ON 4800
ON OFF OFF ON OFF ON OFF 4864
ON OFF OFF ON OFF ON ON 4928
ON OFF OFF ON ON OFF OFF 4992
ON OFF OFF ON ON OFF ON 5056
ON OFF OFF ON ON ON OFF 5120
ON OFF OFF ON ON ON ON 5184
ON OFF ON OFF OFF OFF OFF 5248
ON OFF ON OFF OFF OFF ON 5312
ON OFF ON OFF OFF ON OFF 5376
ON OFF ON OFF OFF ON ON 5440
ON OFF ON OFF ON OFF OFF 5504
ON OFF ON OFF ON OFF ON 5568
ON OFF ON OFF ON ON OFF 5632
ON OFF ON OFF ON ON ON 5696
Table 6. 3088A Clocking
Mode DTE/DCE Clock Source
Internal DCE 3088A Internal Oscillator
Receive-Recover DCE Clock recovered from DSL
External DTE Clock from external Interface
External DCE
Clock from external Interface
a
a. For X.21, external DTE must provide clocking on pins 7 & 14.
Table 5. S4-2 through S4-8 Data Rate DIP switch settings (Continued)
S4-2 S4-3 S4-4 S4-5 S4-6 S4-7 S4-8 Data Rate (kbps)