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Connecting the Model 3088/CA (V.35) to a “DCE” Device
The Model 3088/CA provides a V.35 DCE (data circuit terminating equip-
ment) interface on an DB-25 female connector. As a DCE, this interface
is designed to connect to DTE equipment, such as a router. However,
tail-circuit applications require connection to another DCE equipment,
such as a multiplexer. When connecting the V.35 interface of the Model
3088/CA to your DCE device (see figure 7), use a V.35 tail circuit cable.
Some applications may also require the installation of a V.35 tail-circuit
buffer to account for small differences in clock frequency between the
3088/CA and the V.35 DCE (Multiplexer).
Figure 7. Connecting the Model 3088/CA to V.35 Serial DCE
5.3 CONNECTING THE MODEL 3088/D (X.21) SERIAL INTERFACE
Model 3088/D supports X.21 serial port connections. This section
describes how to connect the serial ports to your X.21 equipment.
Connecting the Model 3088/D (X.21) to a “DCE” or “DTE” Device
The Model 3088/D provides an X.21 interface on a DB-15 female con-
nector. The X.21 interface default configuration is DCE for connection to
DTE (data terminal equipment) such as a router. However, the X.21 inter-
face on the Model 3088/D may be configured as DTE (
data terminal equip-
Straight-Through Cable
DSL Span
Model 3088/CA (DCE)
Remote Model 3088
V.35 Router (DTE)