Cisco Systems 78-10588-03 Manuel D’Utilisation

Channel module outputs, measured at entry to the MUX, point B, or exit of the
DMX, point E, are practically constant for all channel cards, whereas
measurements at the exit of the BSM (point C) or entry to the BSM (point D) can
exhibit a variation of 0 to 2 dB.

All power measurements must be done in-line because of ALS.

All measurements concerning budgets need modulated light. We recommend
using an external modulated light source. Practically any low powered light
source with roughly 100 MHz modulation can be used. If a need for an approved
light source exists, contact your Cisco representative.

You need:

A Cisco Metro 1500 series system

Access to two Cisco Metro 1500 series systems under test already connected
through optical fibers and RSMs (or fiber spools) depending on system
configuration

A short fiber jumper

Access to ocmstate

An optical power meter connected in-line through an optical coupler or an
optical in-line power meter

If you have an external 100-MHz modulated light source, follow Steps 1 to 3 to
measure channel output at point F:

Pick a pair of channel modules preferably without clock (or with a clock that can
be disabled with the ocmstate command, since none of the currently delivered
clocks will match).

Connect the light source output to the connector labeled L/R (local receiver) of
the local channel module. As a result, the green LED of the local receiver of the
channel module is on and the ALS starts working (every 10 seconds the LED for
remote transmitting blinks shortly). However, the signal does not get looped
back yet.