RIC-E1 Installation and Operation Manual Chapter 1 Introduction
Functional Description 1-3
1.3 Functional Description

Functional Block Diagram

Figure 1-3 shows the functional block diagram of RIC-E1.
Txd
Rxclk
Interchangable Interfaces
Rxd
Txclk
Loss
Tst
Ana
LIU
X
Transformers
Clock
Gen.
BNC
Unbalanced
Balanced
Unbalanced
BNC
RJ - 45
P.S .
Select
IMP
Tx & Rx Code
AMI
HDB3
Figure 1-3. RIC-E1 Block Diagram

Timing Reference

RIC-E1 supports three clock modes:
• Internal, derived from its internal oscillator
• External, supplied by the attached DTE
• Receive, recovered from the received line signal.

Diagnostics

RIC-E1 supports a V.54 (loop 3) local loopback activated by the internal jumper of
the standalone RIC-E1 unit, front panel pushbutton of the RIC-E1/R card or via
corresponding pin of the DTE interface connector (not available for X.21 and
Ethernet interfaces). For more information, refer to Chapter 4.
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