Table Of Contents
Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Restrictions for Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Information About Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards Key Features
Integrated Drop and Insert Capability
How to Configure Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Configuring the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
clock source (T1/E1 controller)
Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
The second-generation 1- and 2-port T1/E1 multiflex trunk (MFT) voice/WAN interface cards (multiflex VWICs) support data and voice applications in Cisco multiservice routers. The multiflex VWIC combines WAN interface card (WIC) and voice interface card (VIC) functionality to provide the following improvements:
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Support for both T1 and E1—T1/E1 MFT VWIC2 cards provide additional flexibility in configuring the MFT VWIC2 cards by supporting T1, fractional T1, E1, and fractional E1 for both voice and WAN applications.
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Feature History for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
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Restrictions for Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Cisco IOS Image
To run these features on T1/E1 interfaces, you must install an IP Plus or IP Voice image (minimum) of Cisco IOS Release 12.3(14)T or a later release.
VWIC Support
The multiflex VWIC cards are supported on Cisco 2600XM series, Cisco 2691, Cisco 2800 series, Cisco 3700 series, and Cisco 3800 series routers when installed on the network modules listed in Table 2. The multiflex VWIC cards can also be installed in any VIC slot on the router.
Independent Clocking Mode
The independent clocking mode is supported only on these modules:
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To enable independent clocking mode, use the keyword independent in the clock source command. The independent keyword expands on the clock source internal and clock source line commands to specify that the port can operate on an independent clocking domain. Prior to the addition of the independent keyword, port 0 was the default primary clock source, and port 1 was the default secondary clock source and is loop-timed. With independent clocking enabled, this dependency no longer exists, so the independent keyword means that both ports can be independently clocked.
When independent clocking is configured, the controller will support only one channel group and no voice applications. If more than one channel group is configured, the following error message occurs:
channel-group 2 timeslots 3%Channel-group already created.%Only 1 channel-group can be configured with independent clocking.%Insufficient resources to create channel groupWhen you are configuring the clock source independent and no clock source independent commands, the channel group has to be removed from the configuration.
Information About Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
This section provides information about the following:
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Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards Key Features
The second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards have the following key features:
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Table 1 lists the names and descriptions of the modules available for this feature.
Table 1 Modules with Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
VWIC2-1MFT-T1/E1
1-port RJ-48 multiflex voice/WAN trunk (T1/E1)
VWIC2-2MFT-T1/E1
2-port RJ-48 multiflex voice/WAN trunk (T1/E1)
VWIC2-1MFT-G7032
1-port RJ-48 multiflex trunk (E1 G.703)
VWIC2-2MFT-G703
2-port RJ-48 multiflex trunk (E1 G.703)
1 These baseboards can also provide hardware echo cancellation if there is a daughter card (EC-MFT-32 or EC-MFT-64) mounted on the baseboard. For more information, refer to the Voice Port Configuration Guide on Cisco.com.
2 Although unstructured G.703 operation is particular to E1 operation, the VWIC2-1/2MFT-G703 cards also support structured T1 operation.
Integrated Drop and Insert Capability
The drop and insert feature enables the removal of DS0 time slots from one E1 interface and insertion into time slots of the other E1 interface. This feature is available in VWIC applications. If you configure drop and insert, be sure that the E1 framing under the controllers involved (the tdm-groups configuration location) is the same. If you use different frame types, the signaling bits may not be read properly. This failure occurs during the drop of a channel from one controller and insertion into a channel from another controller. Drop and insert time slots do not need to be contiguous.
Network Module Support for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Table 2 summarizes the network modules supported by the second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards.
Table 2 Network Module Support for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
NM-HDV
Choose zero or one
VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-2MFT-G703NM-HDV2
Choose zero or one
VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-1MFT-G703
VWIC2-2MFT-G703NM-HD-2VE
Choose zero, one, or two
VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1NM-2W NM-1FE1R2W NM-1FE2W-V2 NM-2FE2W-V2
Choose zero, one, or two
VWIC2-1MFT-T1/E1
VWIC2-2MFT-T1/E1
VWIC2-1MFT-G703
VWIC2-2MFT-G703
1 For this feature to work properly, the network modules listed here must be installed in one of the following platforms: Cisco 2600XM series, Cisco 2691, Cisco 2800 series, Cisco 3662 (telco models), Cisco 3700 series, and Cisco 3800 series
How to Configure Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
To configure the second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards feature, perform the task described in the following section:
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Configuring the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Perform this task to configure a T1 or E1 interface with independent clocking enabled and integrated drop and insert on a multiflex trunk voice/WAN interface card.
SUMMARY STEPS
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framing {crc4 | no-crc4}8.
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linecode {ami | hdb3}9.
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pri-group [timeslots range]11.
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DETAILED STEPS
Configuration Examples for Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
This section provides the following information:
Sample Network Topology for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Figure 1 shows a sample network topology that is provided for reference purposes.
Figure 1 Sample Network Topology for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
Sample Configuration for the Second-Generation 1- and 2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Cards
This section shows a sample configuration for a T1 controller configured for data and drop-and-insert capability:
card type t1 0 0!no network-clock-participate wic 0ip subnet-zeroip cef!no ip dhcp use vrf connected!controller t1 0/0framing esflinecode b8zschannel-group 1 timeslots 1-12 speed 64tdm-group 2 timeslots 13-24!controller t1 0/1framing esflinecode b8zschannel-group 1 timeslots 1-12 speed 64tdm-group 2 timeslots 13-24!!interface Serial0/0:1ip address 10.0.0.1 255.255.255.0!interface Serial0/1:1ip address 10.0.0.2 255.255.255.0!connect t1-xconnect T1 0/0 2 T1 0/1 2!!More detailed syntax information about the commands used with this feature is documented in the Cisco IOS Release 12.3 Voice Command Reference.
Additional References
The following sections provide references related to the second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards.
Related Documents
Hardware installation instructions for network modules
Cisco Network Module Hardware Installation Guide
General information about voice configuration and command reference
Cisco IOS Voice Command Reference, Release 12.3 T
Information and instructions for voice port configuration and hardware echo cancellation
Cisco IOS Voice Port Configuration Guide, Release 12.3 T
Standards
ITU-T G.164
Echo Suppressors
ITU-T G.165
Echo Cancellers
ITU-T G.168
Digital Network Echo Cancellers
MIBs
RFCs
Technical Assistance
Command Reference
This section documents one modified command.
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clock source (T1/E1 controller)
To set clocking for individual T1 or E1 links, use the clock source command in controller configuration mode. To return to the default, use the no form of this command.
clock source {line [primary | bits | independent] | internal [independent] | free-running}
no clock source
Syntax Description
Defaults
The default is line.
Command Modes
Controller configuration
Command History
Usage Guidelines
For a detailed discussion of clock sources on individual ports, refer to "Clock Sources on Digital T1/E1 Voice Ports" in the "Configuring Voice Ports" chapter of the Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.3.
Examples
The following example shows the router providing clock source to two controllers:
Router(config)# controller E1 1/0Router(config-controller)# framing crcRouter(config-controller)# linecoding hdb3Router(config-controller)# clock source internalRouter(config-controller)# ds0-group timeslots 1-15 type e&m-wink-start!Router(config)# controller E1 1/1Router(config-controller)# framing esfRouter(config-controller)# linecoding b8zsRouter(config-controller)# clock source internalRouter(config-controller)# ds0-group timeslots 1-15 type e&m-wink-startThe following example shows the digital voice hardware receiving clocking for the PLL from E1 1/0 and using this clock as a reference to clock E1 1/1. If controller E1 1/0 fails, the PLL internally generates the clock reference to drive E1 1/1.
Router(config)# controller E1 1/0Router(config-controller)# framing crcRouter(config-controller)# linecoding hdb3Router(config-controller)# clock source lineRouter(config-controller)# ds0-group timeslots 1-15 type e&m-wink-start!Router(config)# controller E1 1/1Router(config-controller)# framing crc4Router(config-controller)# linecoding hdb3Router(config-controller)# clock source internalRouter(config-controller)# ds0-group timeslots 1-15 type e&m-wink-startThe following example shows the router being configured to receive clocking from the BITS.
Router(config)# network-clock-participate slot 1Router(config)# network-clock-select 1 E1 1/1Router(config)# controller E1 1/1Router(config-controller)# clock source line bitsRelated Commands
controller
Configures a T1 or E1 controller and enters controller configuration mode.
Glossary
a-law—A companding technique commonly used in Europe. Standardized as a 64-kbps codec in G.711.
cancelled end—The side of an echo canceller that contains the echo path on which this echo canceller is intended to operate. This includes all transmissions facilities and equipment (including the hybrid and terminating telephone set) included in the echo path.
CAS—channel-associated signaling. RBS on a T1 interface; R2, SS1, or P7 on an E1 interface.
combined loss—The sum of echo return loss, echo return loss enhancements, and nonlinear processing loss (if present).
comfort noise—Insertion of pseudorandom noise during the silent interval when the NLP operates or allowance of some of the background or idle channel noise to pass through the NLP in order to prevent the annoyance of intervals of speech with background noise followed by intervals of silence.
composite echo—Consists of electric echoes and acoustic echoes caused by reflected signals at hybrids and acoustic environments (for example, analog hands-free telephones).
convergence—Process of developing a model of echo path, which will be used in the echo estimator to produce the estimate of the circuit echo.
convergence time—For a defined echo path, the interval between the instant a defined test signal is applied to the receive-in port of an echo canceller with the estimated echo path impulse response initially set to zero, and the instant the returned echo level at the send-out port reaches a defined level.
E1—European equivalent of T1. E1 provides 32 64-kbps channels include 1 channel for framing and 1 channel for D-channel information. 2.048-MHz clock rate.
echo path—The transmission path between Rout and Sin of an EC. This term is intended to describe the signal path of the echo.
echo path capacity—The maximum echo path delay for which an echo canceller is designed to operate.
echo path delay—The delay between the receive-out port Rout and the send-in port Sin ports of the echo canceller.
ERL—echo return loss. The attenuation of the signal between the receive-out port Rout and the send-in port Sin ports of the echo canceller.
ERLE—echo return loss enhancement. The amount of echo attenuation provided by the echo canceller.
ESF—extended superframe: T1 framing technique with 24 frames per superframe, which allows additional signaling.
FXO—Foreign Exchange Office. An FXO interface connects to a central office.
FXS—Foreign Exchange Station. An FXS interface connects directly to a standard telephone, supplying basics such as ring voltage and dial tone.
G.168—ITU-T standard that establishes the minimum performance requirements for echo cancellers.
ground-start—Used for PBX and other services that must have ground signal to indicate when a dial tone is applied by the serving switching system or is used to avoid glare. Ground-start minimizes the possibility of glare and provides far-end disconnect supervision (for example, the remote user can disconnect and the local FXO can be made aware of this disconnection and also disconnect).
H register—The register within the echo canceller that stores the impulse response model of the echo path.
H.323—An Internet standard that defines a common set of codecs, call setup and negotiating procedures, and basic data transport methods.
IMA—inverse multiplexing for ATM.
immediate-start—In the immediate start protocol, the originating side does not wait for a wink before sending addressing information. After receiving addressing digits, the terminating side goes off-hook for the duration of the call. The originating endpoint maintains off-hook state for the duration of the call.
leak time—The interval between the instant a test signal is removed from the receive-in port of a fully converged echo canceller and the instant the echo path model in the EC changes such that, when a test signal is reapplied to Rin with the convergence circuitry inhibited, the returned echo is at a defined level.
loop-start—Used for ordinary telephone key systems. The advantage is no need for accurate ground reference between the CO or FXS and the telephone or FXO. The disadvantage is poor glare resolution and no far-end disconnect supervision. When the remote handset or line hangs up, there is no provision for the local CO or FXS to notify the FXO of the disconnection.
noncancelled end—The side of an EC that does not contain the echo path on which this EC is intended to operate.
NLP—Nonlinear Processor. A component of the echo canceller that provides additional ERLE.
open echo path—An echo path with infinite echo return loss.
OOF—Out of Frame (G.706) consecutive frame alignment signals received in error.
PRI—Primary Rate Interface. ISDN interface to 64-kbps D channel plus 23 (T1) or 30 (E1) B channels for voice or data.
pure delay—The delay from Rout port to Sin port due to the delays inherent in the near-end echo path transmission facilities, not including dispersion time due to the network elements.
RAI—remote alarm indication.
R2—a non-ISDN signaling method for E1 interfaces.
RBS—robbed bit signaling. A form of signaling that "robs" a bit from the user's data stream to provide supervisory and signaling information to and from the switch. RBS emulates older analog trunk and line signaling methods by providing a 1:1 mapping of analog supervisory signaling to the signaling bits (A, B, C, D).
residual echo level—The level of the echo signal that remains at the send-out port of an operating EC after imperfect cancellation of the circuit echo.
SF—Superframe, or D4 framing, 12 frames per superframe for in-band signaling extraction.
Sgen—Signal coming from the near end.
tail length—The maximum delay between the source signal transmitted by the voice module and the echo signal returned by the hybrid in the tail circuit. In other words, tail length specifies the length of time that the echo canceller stores its approximation of an echo in memory (that is, the echo canceller's cache). It is the maximum echo delay that an echo canceller will be able to eliminate.
T1—Provides 24 64-kbps time slots on a 1.544-Mbps serial interface.
TE—Terminal equipment mode of IOM-2 bus. Timing is supplied from the line or WIC.
VWIC—voice/WAN interface card.
wink—Telco terminology for a specific transition of the signaling bits on a T1 line. If the originating state of the signaling bits indicates on-hook, then a "wink" is an on-hook to off-hook to on-hook transition. The timing of the wink and the values of the signaling bits for on-hook and off-hook can depend on signaling type.
wink-start—The terminating side responds to an off-hook from the originating side with a short wink. This wink tells the originating side that the terminating side is ready to receive addressing digits. After receiving addressing digits, the terminating side then goes off-hook for the duration of the call.
Note
Copyright © 2005 Cisco Systems, Inc. All rights reserved.
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