Cisco MC3810-APM-FXO= Datasheet download pdf (Page 6)

Configuring Voice Ports

Analog Voice Ports Configuration Task List

VC-40

Cisco IOS Voice, Video, and Fax Configuration Guide

PBXs built by different manufacturers can indicate on-hook/off-hook status and telephone line seizure

on the E&M interface by using any of three types of access signaling that are as follows:

• Immediate-start is the simplest method of E&M access signaling. The calling side seizes the line by

going off-hook on its E-lead and sends address information as dual-tone multifrequency (DTMF)

digits (or as dialed pulses on Cisco 2600 series routers and Cisco 3600 series routers) following a

short, fixed-length pause.

• Wink-start is the most commonly used method for E&M access signaling, and is the default for

E&M voice ports. Wink-start was developed to minimize glare, a condition found in immediate-start

E&M, in which both ends attempt to seize a trunk at the same time. In wink-start, the calling side

seizes the line by going off-hook on its E-lead, then waits for a short temporary off-hook pulse, or

“wink,” from the other end on its M-lead before sending address information. The switch interprets

the pulse as an indication to proceed and then sends the dialed digits as DTMF or dialed pulses.

• In delay-dial signaling, the calling station seizes the line by going off-hook on its E-lead. After a

timed interval, the calling side looks at the status of the called side. If the called side is on-hook, the

calling side starts sending information as DTMF digits; otherwise, the calling side waits until the

called side goes on-hook and then starts sending address information.

Analog Voice Ports Configuration Task List

Analog voice port interfaces connect routers in packet-based networks to analog two-wire or four-wire

analog circuits in telephony networks. Two-wire circuits connect to analog telephone or fax devices, and

four-wire circuits connect to PBXs. Typically, connections to the PSTN CO are made with digital

interfaces.

This section describes how to configure analog voice ports and covers the following topics:

• Configuring Codec Complexity for Analog Voice Ports on the Cisco MC3810 with

High-Performance Compression Modules, page 45

• Configuring Basic Parameters on Analog FXO, FXS, or E&M Voice Ports, page 46

• Configuring Analog Telephone Connections on Cisco 803 and 804 Routers, page 50

Table 5 E&M Wiring and Signaling Methods

E&M Type E-Lead Configuration

M-Lead

Configuration

Signal Battery Lead

Configuration

Signal Ground Lead

Configuration

I Output, relay to

ground

Input, referenced to

ground

——

II Output, relay to SG Input, referenced to

ground

Feed for M,

connected to –48V

Return for E,

galvanically isolated

from ground

III Output, relay to

ground

Input, referenced to

ground

Connected to –48V Connected to ground

V Output, relay to

ground

Input, referenced to

–48V

——

1 2 3 4 5 6 7 ... 82

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