Carrier Access SNMP manual Receive Digital-to-Analog Gain, 11.13 E&M Voice Channel Monitoring

4-Wire E&M/TO Configuration

T1 level = 3dBm + 16dB + 2dB - 21dB = 0dBm0

11.12 Receive (Digital-to-Analog) Gain

To calculate the receive level on the T1, R1 pair, use the following formula:

T1/R1 level = T1 level +åGain Switches -21dB

The following is an example of setting receive gain:

Suppose the T1 input level to codec is at -1dBm0. With all switches off, the output at the T1, R1 pair is -1dBm -21db = -22dBm. To set a 4-wire transmission level of 0dBm, switches 7, 9 and 10 (gains 2dB, 8dB, and 16dB) must be turned on. The level at the T1, R1 pair is then:

T1/R1 level = -1dBm0 + 2dB + 8dB +16dB -21dB = 0dBm.

11.13 E&M Voice Channel Monitoring

11.13.1 Call Progress LED Indicators

A bank of LEDs on the ABI back plate are used to monitor the status of incoming or outgoing calls on each of the twelve voice channels. When viewing the LED bank, channel 1 corresponds to the LED in the top left hand corner. Other channels are arranged left to right, row by row (like reading a book), so channel 12 is in the bottom right corner. The meaning of the states of these 12 LEDs are summarized in Table 11-6.

Table 11-6: E&M Channel Status LEDs

LED State	Meaning
Off	Idle state
Green	Analog side is Off Hook
Red	Digital side is Off Hook
Yellow	Analog and Digital sides are both Off Hook

11.14 E&M Normal mode cable

11.14.1 Description

E&M normal mode cable, 96-pin DIN female to two Telco 50-pin males.

11-10 9/24/01