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Clocking modes 72
Model 3088 Series User Manual B • Specifications
Clocking modes
Internal, external (V.35 only), or receive recovered
DTE rate
All 64k steps from 64 to 4608 kbps
Serial interface
V.35 (Model 3088/CA), DCE orientation;
X.21 (Model 3088/D), DCE or DTE orientation depending on orientation of daughter board mounted on the
mother board.
E1 (Model 3088/K) presents G.703/G.704 interface. Either 75 Ohms (unbalanced) or 120 Ohms (balanced).
Pins 1 & 2 are Receive. Pins 4 & 5 are Transmit.
T1 (Model 3088/T) present T1 interface. Pins 1 & 2 are Receive. Pins 4 & 5 are Transmit.
Serial connector
D-Sub-25 Female (Model 3088/CA)
D-Sub-15 Female (Model 3088/D)
Dual BNC and RJ48C (Model 3088/K), strap selectable
RJ48C connector (Model 3088/T)
Diagnostics
V.52 compliant (511/511E) pattern generator and detector with error injection mode controlled by front-
panel switch. Local and Remote Loopback control either by a front-panel switch or from the DTE interface.
Status LEDs
Power (Green)
The Power LED glows solid during normal operation. At startup, during the POST, the LED blinks once
every second. If the POST fails, the unit does not enter normal operation, and the LED blinks once every
0.4 seconds.
DSL (Green)
The DSL LED glows solid while a DSL link is established. While the DSL link is training it blinks once every
second.
Link (Green) (T1/E1 only)
Solid green indicates valid T1/E1 framing. Flashing indicates signal being received, but the link has not yet
been established.