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This document describes how to configure1- and 2-port E1 Multiflex Voice/WAN interface cards (VWICs) on Cisco 2600 and 3600 routers for G.703 framing and includes the following sections:
The following Multiflex VWICs are available:
These Multiflex VWICs provide up to two E1 interfaces, which are compatible with and specified by G.703. These Multiflex VWICs provide the following additional features and capabilities:
When the Multiflex VWIC is initialized, the Cisco IOS software reads the VWIC's cookie ID to determine that the card is to be used as an E1 card; then the firmware loads the proper configuration onto the card. The cookie also indicates whether the card is single or dual port card. Cisco IOS software recognizes the G.703 cookie ID to permit G.703 operation on E1 cards.
Table 1 shows the possible hardware configurations for the Multiflex VWICs.
| VWIC and Application | Cisco 2600 Series | Cisco 3620 and 3640 | Cisco 3660 |
|---|---|---|---|
1-port Data only | E1 VWIC in a chassis slot | E1 VWIC in a 1- or 2-port network module (NM-1E2W, NM-2E2W, NM-1E1R2W) | Planned for future availability |
2-port Data only | E1 VWIC in a chassis slot. Does not provide packet voice. Can provide two physical WAN connections with both ports supporting up to full E1 speeds. | Planned for future availability | Planned for future availability |
1- or 2-port Voice only, no WAN connections | E1 VWIC in a Digital E1 Packet Voice Trunk Network Module | E1 VWIC in a Digital E1 Packet Voice Trunk Network Module | E1 VWIC in a Digital E1 Packet Voice Trunk Network Module |
The E1 Multiflex VWICs with G.703 support allows unstrucutred E1 traffic that conforms to the ITU-T G.703 standard.
The following restrictions apply to E1 Multiflex VWIC configurations:
See Table 1 on page 2 for summary information.
Digital E1 Packet Voice Trunk Network Modules requires 2-port E1 Multiflex VWIC for operation. For more information about these modules, see the Configuring Digital E1 Packet Voice Trunk Network Modules on Cisco 2600 and 3600 Series Routers online document.
The following documents provide additional information about installing and configuring T1/E1 Multiflex VWICs:
The following Cisco IOS Release 12.1 documents provide information that can help you use E1 Multiflex VWICs:
This feature is supported on the following platforms:
T1/E1 Multiflex VWICs support the standards, MIBs, and RFCs listed in this section.
RFC 1406
E1 Multiflex VWICs require specific service, software, and hardware:
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Note You can install one Digital E1 Packet Voice Trunk Network Module in a Cisco 2600 series router or a Cisco 3620 router. A Cisco 3640 router can support three modules. |
Voice, Video, and Home Applications Configuration Guide and Voice, Video, and Home Applications Command Reference for Cisco IOS Release 12.1 provide information about setting up voice networks.
Configuration for E1 Multiflex VWICs with G.703 support is done when you are setting up the E1 controller.
For more information about configuring a E1 Multiflex VWIC that is installed in a Digital E1 Packet Voice Trunk Network Module, see Configuring Digital E1 Packet Voice Trunk Network Modules on Cisco 2600 and 3600 Series Routers.
For more information about configuring a E1 Multiflex VWIC that is installed in a Digital E1 Packet Voice Trunk Network Module, see Configuring Digital E1 Packet Voice Trunk Network Modules on Cisco 2600 and 3600 Series Routers.
Follow this procedure to configure E1 controllers. Skip Steps 1 and 2 if you are already in controller configuration mode.
Repeat the steps following Step 2 for each controller.
| Command | Purpose | |
|---|---|---|
Step 1 | Router# configure terminal | Skip this step if you are already in controller configuration mode. Enter global configuration mode. |
Step 2 | Router(config)# controller E1 slot/port
| Skip this step if you are already in controller configuration mode. Enter controller configuration mode for the E1 controller at the specified slot/port location. |
Step 3 | Router(config-controller)# clock source {line | Specify the clock source. The line keyword specifies that the clock source is derived from the active line--rather than from the free-running internal clock. This is the default setting and is generally more reliable. These rules apply to clock sourcing:
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Step 4 | Router | Set the line encoding according to your service provider's instructions. For E1, set the line coding to either AMI or high-density bipolar 3 (HDB3), the default. Alternate mark inversion (AMI), available for T1 or E1 lines, represents zeros using a 01 during each bit cell, and ones are represented by 11 or 00, alternately, during each bit cell. AMI requires that the sending device maintain ones density. Ones density is not maintained independent of the data stream. |
Step 5 | Router(config-controller)# line-termination {75-ohm | | Enter a line-termination value. This command specifies the impedance (amount of wire resistance and reactivity to current) for the E1 termination. Impedance levels are maintained to avoid data corruption over long-distance links. Specify 120-ohm to match the balanced 120-ohm interface. This is the default. 75-ohm is for an unbalanced BNC 75-ohm interface. |
Step 6 | Router(config-controller)# channel-group | Enter this command to set up channel groups for WAN data services with a 2-port Multiflex Drop-and-Insert VWIC. Specify unframed for G.703 support. |
Step 7 | Router(config-controller)# no shutdown | Activate the controller. |
The privileged EXEC show controllers e1 command displays the status of E1 controllers and displays information about clock sources and other settings for the ports:
Router# show controller E1 1/0
E1 1/0 is up.
Applique type is Channelized E1 - balanced
Cablelength is short 133
Description: T1 WIC card Alpha
No alarms detected.
Framing is UNFRAMED, Line Code is HDB3, Clock Source is Line.
Data in current interval (1 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
The privileged EXEC show connection all command displays the status of E1 TDM controller groups and how they are set up:
Router# show connection all ID Name Segment 1 Segment 2 State ======================================================================== 1 Test -E1 1/0 01 -E1 1/1 02 ADMIN UP
This section includes a sample configuration of an E1 Multiflex VWIC configured to support G.703.
For additional examples, see Configuring Digital T1 Packet Voice Trunk Network Modules on Cisco 2600 and 3600 Series Routers.
version 12.1 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname 3660-1 ! enable password lab ! ! memory-size iomem 25 voice-card 1 ! voice-card 3 ! voice-card 4 ! ip subnet-zero no ip domain-lookup ip host dirt 223.255.254.254 ! isdn switch-type primary-net5 isdn voice-call-failure 0 ! ! controller E1 1/0 pri-group timeslots 1-31 ! controller E1 1/1 pri-group timeslots 1-31 ! controller E1 3/0 channel-group 0 unframed ! controller E1 3/1 ! controller E1 4/0 clock source internal channel-group 1 timeslots 1 ! controller E1 4/1 pri-group timeslots 1-31 ! ! interface FastEthernet0/0 mac-address 0010.7bd8.da30 ip address 1.6.44.201 255.255.0.0 no ip mroute-cache load-interval 30 no keepalive speed auto half-duplex hold-queue 2000 in ! interface FastEthernet0/1 ip address 10.0.0.250 255.255.255.0 no ip mroute-cache load-interval 30 duplex auto speed auto ! interface Serial1/0:15 no ip address ip mroute-cache no logging event link-status isdn switch-type primary-net5 isdn incoming-voice voice isdn guard-timer 3000 fair-queue 64 256 0 no cdp enable ! interface Serial1/1:15 no ip address ip mroute-cache no logging event link-status isdn switch-type primary-net5 isdn incoming-voice voice isdn guard-timer 3000 fair-queue 64 256 0 no cdp enable ! interface Serial3/0:0 ip address 40.0.0.1 255.255.255.0 ip mroute-cache
Syntax Description
channel-number Channel-group number. When configuring a T1 data line, channel-group numbers can be values from 0 to 23. When configuring an E1 data line, channel-group numbers can be values from 0 to 30. unframed (E1 only) Specifies an unframed channel group for G.703 support. timeslots range One or more time slots or ranges of time slots belonging to the channel group. The first time slot is numbered 1. For a T1 controller, the time slot range is from 1 to 24. For an E1 controller, the time slot range is from 1 to 31. speed {48 | 56 | 64} (Optional) The speed of the underlying DS0s. See Usage Guidelines for additional information.
Defaults
The default line speed when configuring a T1 controller is 56 kbps.
The default line speed when configuring an E1 controller is 64 kbps.
Command Modes
Controller configuration
Command History
11.3MA This command was introduced. 12.1(1)T This command was supported on Cisco 2600 and 3600 series routers. The command was modified to support unframed channel groups.
Release
Modification
Usage Guidelines
Use this command in configurations where the router or access server must communicate with a T1 or E1 fractional data line. The channel-group number may be arbitrarily assigned and must be unique for the controller. The time slot range must match the time slots assigned to the channel group. The service provider defines the time slots that comprise a channel group.
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Note Channel groups, CAS voice groups, and TDM groups all use group numbers. All group numbers configured for channel groups, CAS voice groups and TDM groups must be unique on the local Cisco MC3810 concentrator. For example, you cannot use the same group number for a channel group and for a TDM group. |
If you specify 56 kbps, the channel group is limited to 14 channels on the Cisco MC3810 MultiFlex Trunk (MFT). Because 56 is the default, you should specify 64 if you need more than 14 channels.
This command also applies to Voice over Frame Relay, Voice over ATM, and Voice over HDLC on the Cisco MC3810.
Examples
The following example defines three channel groups. Channel-group 0 consists of a single time slot, channel-group 8 consists of 7 time slots and runs at a speed of 64 kbps per time slot, and channel-group 12 consists of a single time slot.
channel-group 0 timeslots 1 channel-group 8 timeslots 5,7,12-15,20 speed 64 channel-group 12 timeslots 2
The following example configures a channel group on controller T1 0 on a Cisco MC3810:
controller T1 0 channel-group 10 timeslots10 64
The following example configures a channel group on controller E1 1/0 on a Cisco 2600 or 3600 series router that supports G.703:
controller E1 1/0 channel-group 0 unframed
Related Commands
force-local-chap Selects the frame type for the T1 or E1 data line. linecode Selects the linecode type for T1 or E1 line.
Command
Description
Posted: Tue Aug 8 15:13:22 PDT 2000
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