Cisco MC3810-APM-FXO= Datasheet download pdf (Page 32)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-66

Cisco IOS Voice, Video, and Fax Configuration Guide

Figure 16 T1 Controller Conﬁguration on Cisco 2600 or 3600 Series Routers

Voice port controller configuration includes setting the parameters described in the following sections:

• Framing Formats on Digital T1/E1 Voice Ports

• Clock Sources on Digital T1/E1 Voice Ports

• Line Coding on Digital T1/E1 Voice Ports

• DS0 Groups on Digital T1/E1 Voice Ports

Another controller command that might be needed, cablelength, is discussed in the Cisco IOS Interface

Command Reference, Release 12.2.

Framing Formats on Digital T1/E1 Voice Ports

The framing format parameter describes the way that bits are robbed from specific frames to be used for

signaling purposes. The controller must be configured to use the same framing format as the line from

the PBX or CO that connects to the voice port you are configuring.

Digital T1 lines use super frame (SF) or extended super frame (ESF) framing formats. SF provides

two-state, continuous supervision signaling, in which bit values of 0 are used to represent on-hook and

bit values of 1 are used to represent off-hook. ESF robs four bits instead of two, yet has little impact on

voice quality. ESF is required for 64-kbps operation on DS0 and is recommended for Primary Rate

Interface (PRI) configurations.

E1 lines can be configured for cyclic redundancy check (CRC4) or no cyclic redundancy check, with an

optional argument for E1 lines in Australia.

Clock Sources on Digital T1/E1 Voice Ports

Digital T1/E1 interfaces use timers called clocks to ensure that voice packets are delivered and

assembled properly. All interfaces handling the same packets must be configured to use the same source

of timing so that packets are not lost or delivered late. The timing source that is configured can be

external (from the line) or internal to the router’s digital interface.

V V

Network module slot 1

VWIC slot 0

37760

controller t1 1/0

framing esf

clock source line

linecode b8zs

Configures T1

controller 1/0

Creates DS0 group, or

logical voice port, 1/0:1

by grouping 12

time slots together

ds0-group 1 timeslots 1-12 type e&m-wink-start

1 ... 31 32 33 ... 82

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Cisco MC3810-APM-FXO= Datasheet Page 32

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