Cisco MC3810-APM-FXO= Datasheet download pdf (Page 36)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-70

Cisco IOS Voice, Video, and Fax Configuration Guide

• Dual Voice Ports (Router Provides Both Clocks)—In this scenario, the router generates the clock for

the PLL and, therefore, for both voice ports (see Figure 21).

Figure 21 Dual E1 Ports—both Clocks from the Router

The following configuration sets up this clocking method:

controller E1 1/0

framing crc4

linecoding hdb3

clock source internal

ds0-group timeslots 1-15 type e&m-wink-start

controller E1 1/1

framing esf

linecoding b8zs

clock source internal

ds0-group timeslots 1-15 type e&m-wink-start

Line Coding on Digital T1/E1 Voice Ports

Digital T1/E1 interfaces require that line encoding be configured to match that of the PBX or CO that is

being connected to the voice port. Line encoding defines the type of framing used on the line.

T1 line encoding methods include alternate mark inversion (AMI) and binary 8 zero substitution (B8ZS).

AMI is used on older T1 circuits and references signal transitions with a binary 1, or “mark.” B8ZS, a

more reliable method, is more popular and is recommended for PRI configurations as well. B8ZS

encodes a sequence of eight zeros in a unique binary sequence to detect line-coding violations.

Supported E1 line encoding methods are AMI and high-density bipolar 3 (HDB3), which is a form of

zero-suppression line coding.

DS0 Groups on Digital T1/E1 Voice Ports

For digital voice ports, a single command, ds0-group, performs the following functions:

• Defines the T1/E1 channels for compressed voice calls.

• Automatically creates a logical voice port.

The numbering for the logical voice port created as a result of this command is

controller:ds0-group-no, where controller is defined as the platform-specific address for a particular

controller. On a Cisco 3640 router, for example, ds0-group 1 timeslots 1-24 type e&m-wink

automatically creates the voice port 1/0:1 when issued in the configuration mode for controller 1/0.

On a Cisco MC3810 universal concentrator, when you are in the configuration mode for controller

0, the command ds0-group 1 timeslots 1-24 type e&m-wink creates logical voice port 0:1.

To map individual DS0s, define additional DS0 groups under the T1/E1 controller, specifying

different time slots. Defining additional DS0 groups also creates individual DS0 voice ports.

• Defines the emulated analog signaling method that the router uses to connect to the PBX or PSTN.

E1 1/0

E1 1/1

Clock

26923

Clock

PSTN

PBX

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