Table Of Contents
Configuring Video Support
Configuring Video in Pass-Through Mode
Configuring Video over ATM AAL1
Tuning Circuit Emulation Services Settings
CES Video Traffic Configuration Example
Configuring Video Support
This chapter describes how to configure the Cisco MC3810 multiservice access concentrator for video support, and includes the following sections:
•
Configuring Video in Pass-Through Mode
•Configuring Video over ATM AAL1
•CES Video Traffic Configuration Example
The Cisco MC3810 supports video traffic within a data stream in two ways:
•Video in pass-through mode—Using this method, video traffic received from a video codec connected to a universal input/output (UIO) serial port can be transported on a dedicated timeslot between systems using the time-division multiplexing (TDM) functionality of the T1/E1 trunk.
•Video over ATM AAL1—A serial stream from a video codec connected to a Cisco MC3810 on serial port 0 or 1 can be converted to Asynchronous Transfer Mode (ATM) and transported across an ATM network using AAL1 Circuit Emulation Services (CES) encapsulation.
Note Only V.35 cable is supported for video traffic over serial port 0 or 1.
Configuring Video in Pass-Through Mode
To configure support for video in pass-through mode, complete the following steps from global configuration mode:
Step
|
Command
|
Purpose
|
1
|
router(config)# network-clock
base-rate {56k | 64k}
|
Configure the network-clock base-rate. The default is 56k.
|
2
|
router(config)# interface serial
number
|
Enter serial interface configuration mode for either serial port 0 or 1.
If the video connection will be over a point-to-point network, specify the point-to-point option. The default option, multipoint, assumes you have a fully meshed network.
|
3
|
router(config-if)# encapsulation
clear-channel
|
Configure the serial interface to be in clear-channel mode for pass-through traffic.
|
4
|
router(config-if)# clock rate
network rate
|
If the interface is in DCE mode, configure the network clock speed. The maximum rate supported is 2048 MB.
|
5
|
router(config-if)# no shutdown
|
Activate the interface.
|
6
|
router(config-if)# dce
terminal-timing enable
|
Enable DCE terminal timing to prevent phase shifting of the data with respect to the clock.
|
7
|
|
Exit interface configuration mode.
|
8
|
router(config)# controller t1 0
|
Enter controller configuration mode for controller T1 0.
|
9
|
router(config-controller)#
tdm-group tdm-group-no timeslot
timeslot-list
|
Configure a list of time slots for creating clear channel groups (pass-through) for TDM cross-connect.
|
10
|
router(config)# cross-connect id
interface-serial controller
tdm-group-no
|
Configure cross-connect pass-through from UIO serial port 0 or 1 to a controller.
|
This completes the configuration for video traffic in pass-through mode.
Configuring Video over ATM AAL1
To configure support for video streaming data over ATM AAL1 encapsulation using CES, complete the following steps from global configuration mode:
Step
|
Command
|
Purpose
|
1
|
router(config)# network-clock
base-rate 64k
|
Configure the Cisco MC3810 network clock base-rate to 64 kbps if you have not done so already.
|
2
|
router(config)# controller
{t1 | e1} 0
|
Select T1 or E1 controller 0. ATM is supported only on controller 0.
|
3
|
router(config-controller)# mode
atm
|
Specify that the controller will support ATM encapsulation, and to create virtual ATM interface 0, which you will use to create the ATM permanent virtual circuits (PVCs).
|
4
|
router(config-controller)# exit
|
Exit controller configuration mode.
|
5
|
router(config)# interface atm 0
|
Enter interface configuration mode to configure ATM interface 0.
|
6
|
router(config-if)# pvc
[vpi/vci|] vci]
|
Create an ATM PVC and enter virtual circuit configuration mode.
|
7
|
router(config-if-pvc)#
encapsulation aal1
|
Set the PVC to support AAL1 encapsulation for video.
|
8
|
router(config-if-pvc)# cbr rate
|
Enable constant bit rate (CBR) calculation on the PVC. By default, the rate value used is the value configured with the vc-class command. The valid rate is 56-10,000 kbps. The formula to calculate the CBR is 1.14 times the clock rate on the serial port.
|
9
|
router(config-if-pvc)# exit
|
Exit ATM virtual circuit interface configuration mode.
|
10
|
|
Exit interface configuration mode.
|
11
|
router(config)# interface serial
number
|
Enter serial interface configuration mode for either serial port 0 or 1.
|
12
|
router(config)# clock rate
network rate
|
If the interface is in DCE mode, configure the network clock speed on the interface to support video traffic. The maximum rate supported is 2048 Mb. The value must be a multiple of 64 kbps.
|
13
|
router(config-if)# no shutdown
|
Activate the interface.
|
14
|
router(config-if)# dce
terminal-timing enable
|
Enable DCE terminal timing to prevent phase shifting of the data with respect to the clock.
|
15
|
router(config)# encapsulation
atm-ces
|
Configure the ATM encapsulation type to ATM-CES.
|
16
|
router(config)# ces connect atm0
pvc [name | [vpi/] vci]
|
Map the CES service to the PVC. To do this, you must specify the ATM 0 interface, and configure the ATM PVC.
|
This completes the configuration for video traffic over AAL1. For information about tuning CES settings, see the next section, "Tuning Circuit Emulation Services Settings."
Tuning Circuit Emulation Services Settings
Video streaming traffic over AAL1 uses CES. The default CES settings are sufficient for most configurations. However, you can tune the CES settings as needed.
To change the CES settings, perform the following steps in interface configuration mode:
Step
|
Command
|
Purpose
|
1
|
router(config-if)# ces
initial-delay delay
|
Configure the maximum size of the CES circuit transmit buffer. The range is 1-16,000 bytes, and the default is 4000.
|
2
|
router(config-if)# ces
partial-fill octets
|
Configure the number of user octets per cell for CES. The default is 47.
|
CES Video Traffic Configuration Example
The following is an example for configuring video traffic over ATM AAL1 using Circuit Emulation Services (CES) on a Cisco MC3810:
network-clock base-rate 64k
interface Serial0 point-to-point
clockrate network-clock 768000
ces connect 25 atm0 pvc 25/100
interface ATM0 point-to-point
ip address 223.223.224.229 255.255.255.0
ip 223.223.224.228 atm-vc 26 broadcast
