Nortel DMS-100 Series Maintenance Manual page 191

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Table of Contents

incoming C-side ports of the OPM. The following table shows the OPM ESA

tones, their channel appearance, and cadence.

Table 5 OPM ESA tones

Note: Idle tone uses a start-cadence message, but the OPM connects the

receive path to a port that provides idle tone.

Providing tones

The following steps are required to provide tone to a subscriber:

1. The ESA processor sends a start-cadence message to the ESA clock and

tone card. This message specifies the tone required, the terminal

identification, and the cadence times.

2. When the system receives the start cadence message, the ESA clock and

tone card perform the following actions:

a. If necessary, breaks the current receive path of the terminal

b. Connects the receive path of the terminal to the appropriate port.

c. Sets the specified cadence for that tone.

The following steps are required to clear the tone:

1. The ESA processor sends a stop-cadence message to the ESA clock and

tone card. This message specifies the terminal identification.

2. When the system receives the stop cadence message, the ESA clock and

tone card sends stop-cadence messages to the LCM. This action

disconnects the terminals connection to the correct port and channel 16.

DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up

ESA maintenance overview 4-23

Channel appearance

Cadence (in seconds)

Troubleshooting