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Configuration Tasks
Perform the following tasks to configure VoATM SVCs service:
•
•
•
These tasks do not represent all of the configuration tasks required to set up your ATM network. For
more information, refer to the Cisco MC3810 Multiservice Access Concentrator Software
Configuration Guide and to the examples shown in the "Configuration Examples" section on
page 20.
Configuring Network Clocks and Controller Settings
Because voice communications require a continuous and tightly meshed data stream to avoid loss of
information, and PSTNs provide a variety of clocks, you must synchronize source and destination
devices to a single master clock. In the example that follows, the clock source is derived from a
device attached to T1 controller 0; then the clock source is distributed to the devices attached to the
local Cisco MC3810 serial ports and to T1 controller 1. Base clock source decisions on the network
configuration, and set up a hierarchy of clock sources, so that backup clock sources are available.
For details, see Chapter 4, "Configuring Synchronized Clocking," in Cisco MC3810 Multiservice
Access Concentrator Software Configuration Guide.
This configuration task also includes the basic steps required for ATM support over T1/E1
controller 0.
Step
Command
1
Router# configure terminal
2
Router(config)# controller {T1 | E1} 0
3
Router(config-controller)# clock source line
4
Router(config-controller)# no shutdown
5
Router(config)# controller {T1 | E1} 1
6
Router(config-controller)# clock source internal
7
Router(config-controller)# no shutdown
8
Router(config-controller)# exit
9
Router(config)# framing esf
or
Router(config)# framing crc4
Set up clock sources, T1/E1 controller settings, and serial interfaces.
Configure the ATM interface, including signaling and management PVCs.
Set up voice POTS and ATM dial peers.
Configuring Network Clocks and Controller Settings
Purpose
Enter global configuration mode.
Enter controller configuration mode for controller
T1/E1 0. ATM traffic is supported on controller T1/E1 0
only.
Configure controller T1/E1 0 to obtain the Cisco MC3810
clock source from an attached network device. This is the
default setting.
Activate the controller.
Enter controller configuration mode for controller
T1/E1 1.
Configure controller T1/E1 1 to obtain its clocking from
the internal network clock Phase-Lock-Loop (PLL). In
this way, controller T1/E1 1 obtains clocking from the
T1/E1 0 controller source—the switch.
Activate the controller.
Exit controller configuration mode.
Set the framing to Extended Superframe (ESF) format,
required for ATM on T1. This setting is automatic for T1
when the ATM mode is set.
Set the framing to CRC4, required for ATM on E1. This
setting is automatic for E1 when the ATM mode is set.
Voice over ATM Switched Virtual Circuits on the Cisco MC3810 5
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