User guide

Multi Protocol Test Set 233
15 E1-A and E1-B Tests
E1-A and E1-B are fully independent E1 tests that provides a means for
testing two circuits at once. It allows dual independent tests capability to
insert and detect an alarms/errors.
Setup Configuration
The Setup page allows the user to set up the E1-A test parameters as
explained below.
Press , select DSn/PDH, E1-A or E1-B, and Setup.
³ Mode: Select the test mode.
Choices are Monitor 120 (ohm),
Term 120 (ohm), Bridged (E1-A
only), Frac-E1 (Nx64),
Monitor 75 (ohm), and
Ter m 75 (ohm). The default
setting is Monitor 120 (ohm).
Note: The AXS-805/855 transmitter is off in
Monitor and Bridged modes.
Note: When using the EXFO proprietary RJ48 to quad BNC cable, consider that
the cable has an integrated 120 ohms to 75 ohms impedance converter.
This means that with the EXFO proprietary RJ48 to BNC cable, the Monitor
75 (ohm) and Te r m 7 5 ( o hm) test modes should not be used.
Monitor 120 (ohm): Select this mode to match the line impedance of
the circuit to which you are connecting to the system.
Term 120 (ohm): Select this mode to set the transmitter and receiver
at the same impedance. It is the impedance reflected in a terminate
mode.
Bridged: Available with the E1-A interface only. Select this mode for
monitoring at a high impedance point. The AXS-805/855 receiver is
placed in a >1 k ohm high impedance state for monitoring RX or TX
lines.