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Serial Port and T1/E1 Trunk Configuration

Serial Port and T1/E1 Trunk Configuration

This chapter describes how to configure serial ports 0 and 1, and the T1/E1 trunk on the Cisco  MC3810 multiservice access concentrator. This chapter includes the following sections:

Note This chapter describes how to configure serial ports and how to configure settings for the T1/E1 trunk. This chapter does not describe how to configure synchronized network clocking on serial ports and the T1/E1 trunk. For more information, see "Configuring Synchronized Clocking."

For information on configuring Frame Relay or Asynchronous Transfer Mode (ATM) for data traffic only, see the Wide Area Networking Configuration Guide. For information on configuring voice traffic over Frame Relay, ATM or High Level Data Link Control (HDLC), see the appropriate chapters in this guide.

The Cisco MC3810 concentrator provides two universal input/output (UIO) serial ports for voice, video, and data traffic, a T1/E1 trunk, and either six analog voice ports or one digital voice module (DVM) that provides 24 digital voice ports for voice traffic.

The Cisco MC3810 also provides support for ISDN BRI and ISDN PRI only in the following cases:

For more information, see the "Configuring ISDN BRI Backup" section.
For more information, see "Configuring Support for PBX Signaling Formats."

Figure 3-1 and Figure 3-2 show logical representations of the interface port options for the two different Cisco  MC3810 versions and the types of devices to which each port type can be connected.


Figure 3-1: Cisco MC3810 Ports (Analog Voice Port Version)


Note For this example, the analog voice port configuration shown includes two of each type of analog voice personality module. These voice personality modules can be installed in any combination. For information on configuring voice ports, see Chapter 10, "Configuring Voice Ports."

Figure 3-2: Cisco MC3810 Ports (Digital Voice Port Version)


The configuration procedures in this guide progress from configuring the physical port specifications to the higher-layer network configurations necessary to configure voice or video traffic over the WAN backbone.

Table 3-1 provides an overview of the serial ports, and the traffic types each supports.


Table 3-1:
WAN Traffic Types UIO Serial Port 0 UIO Port 1 T1/E1 Trunk

ATM

Not supported

Not supported

Data

Compressed voice

Circuit Emulation Services (CES) video

Frame Relay

Data

Compressed voice

Data

Compressed voice

Data

Compressed voice (one channel group only)

Serial Port and T1/E1 Trunk Traffic Type Support

Figure 3-3 shows a graphic representation of the different trunk options for the serial ports.


Figure 3-3: Cisco MC3810 Trunk Options


Configuring Basic Settings for Serial Ports 0 or 1

To configure basic settings for serial ports 0 and 1, complete the following steps:

Step Command Purpose
1 
router> show interface serial 

{0 | 1}

Display the default configuration.

2 
router> enable

Enable privileged EXEC command mode.

3 
router# configure terminal

The following message displays:

Enter configuration commands, 
one per line.  End with CNTL/Z.
router(config)#

Enter global configuration mode.

5 
router(config)# interface 
serial {0 | 1}

Enter serial interface configuration mode.

6 
router (config-if)# ip address 
address mask [secondary]

Enter the IP address for the serial port.

9 
router(config-if)# 

encapsulation clear-channel

If the serial port will be used to cross-connect to a trunk controller, set the encapsulation to clear-channel. For more information about configuring the serial port to a trunk controller, see the "Configuring TDM Cross-Connect (Data Pass-Through)" section.

10 
router(config-if)# no shutdown

Activate the serial port.

11

Repeat steps 5 through 10 to configure the other serial port.

This completes the basic configuration for serial ports 0 and 1.

Note By default, serial ports 0 and 1 are in data terminal equipment (DTE) mode. To switch the serial port to data communications equipment (DCE) mode, use the frame-relay intf-type interface configuration command.

Verifying the Configuration

To verify the serial interface configuration, enter the following command in privileged EXEC mode:

Step Command Purpose
1 
router# show interface serial 

{0 | 1}

Display the serial port configuration to verify the new settings.

Configuring T1/E1 Controller Settings

The T1/E1 controller is used as the trunk interface for many applications on the Cisco MC3810. To serve as the trunk interface, the T1/E1 controller is associated with the multiflex trunk module (MFT), which provides support for either ANSI T1.403 (T1) or ITU G.703 (E1). The MFT also provides a built-in channel service unit/data service unit (CSU/DSU).

Note In previous releases, the designation "serial 2" indicated the T1/E1 trunk. That designation is no longer valid.
Note When configuring the T1/E1 controller settings when using the digital voice module (DVM), select a framing format that best suits the type of signals that are carried by the T1/E1. Some T1/E1 equipment can be confused by repeating data patterns, such as when all voice channels are idle, and may have difficulty maintaining frame synchronization with some frame formats. In these cases, choose a different framing format or vary the location and CAS-type of voice channels, to help the external T1/E1 equipment maintain frame synchronization.

To configure the basic controller settings for the T1/E1 trunk, complete the following steps:

Step Command Purpose
1 
router> enable

Enable privileged EXEC command mode.

2 
router# configure terminal

The following message displays:

Enter configuration commands, 
one per line.  End with CNTL/Z.
router(config)#

Enter global configuration mode.

3 
router(config)# controller 

{t1 | e1} number

Enter controller configuration mode. Specify whether your controller is T1 or E1, and enter the controller number.

The number should be 1 if the controller is for the interface to the local phone device or PBX (through the DVM). The number should be 0 for the interface to the WAN (through the MFT).

4 
router(config-controller)# 
description LINE

Enter a description of the controller, such as the destination or its application, for the LINE value. The description can be up to 80 characters long.

After you have completed these basic settings, proceed to the "Configuring T1 Controller Settings" section or the "Configuring E1 Controller Settings" section depending on the controller type.

Configuring T1 Controller Settings

To configure T1 controller settings, complete the following steps in controller configuration mode:

Step Command Purpose

1

router(config-controller)# 
framing {sf | esf}

Configure the DS1 link framing format. Extended SuperFrame format (ESF) is required for ATM traffic.

2

router(config-controller)# fdl 
{ansi| att | both}

(Optional) If the framing format was configuring to esf, you can configure the format used for Facility Data Link (FDL). Select ansi for FDL to use the ANSI T1.403 standard. Select att for FDL to use the AT&T TR54016 standard. Select both to use both formats.

3

router(config-controller)# 
linecode {ami | b8zs}

Configure the line encoding format for the DS1 link. The b8zs setting is required for Frame Relay and ATM traffic.

4

router(config-controller)# no 
shutdown

Activate the T1 controller.

5

router(config-controller)# 
exit

Exit controller configuration mode.

This completes the T1 controller configuration.

Verifying the Configuration

To verify the T1 controller configuration, enter the following command in privileged EXEC mode:

Step Command Purpose

1

router# show controller T1 
{0|1}

Verify the controller configuration.

Configuring E1 Controller Settings

To configure E1 controller settings, complete the following steps in controller configuration mode:

Step Command Purpose

1

router(config-controller)# 
framing {crc4 | no-crc4} 
[australia]

Configure the E1 framing format. If the trunk will be connected to a device in Australia, enter the australia option.

2

router(config-controller)# 
linecode {ami | hdb3}

Configure the E1 line encoding format. The hdb3 setting is required for Frame Relay and ATM traffic.

3

router(config-controller)# no 
shutdown

Activate the E1 controller.

4

router(config)# exit

Exit configuration mode.

This completes the E1 controller configuration.

Verifying the Configuration

To verify the E1 controller configuration, enter the following command in privileged EXEC mode:

Step Command Purpose

1

router# show controller E1 
{0|1}

Verify the controller configuration.

Performing E1 Controller Loopback Diagnostics

To perform E1 controller loopback diagnostics as needed, complete the following steps in controller configuration mode:

Step Command Purpose

1

router(config-controller)# 
loopback {local | line | 
payload}

Place the E1 controller into loopback mode.

2

router(config-controller)# no 
loopback {local | line | 
payload}

When finished performing the loopback diagnostics, disable loopback mode.

Advanced Configurations

This section describes how to do the following configurations that are more advanced, or might be applicable to only specific situations:

Note Channel groups, CAS voice groups, time-division multiplexing (TDM) groups and voice groups are assigned group numbers. All group numbers configured for channel groups, CAS voice groups, TDM groups and voice 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.

Performing T1 Controller Loopback Diagnostics

To perform T1 controller loopback diagnostics as needed, complete the following steps in controller configuration mode:

Step Command Purpose

1

router(config-controller)# 
loopback {local | remote | line 
| payload}

Place the T1 controller into loopback mode.

2

router(config-controller)# 
loop-detect

Enable loop detection on the T1 controller.

3

router(config-controller)# no 
loopback {local | remote | line 
| payload}

When finished performing the loopback diagnostics, disable loopback mode.

Configuring T1 Cable Length Settings

To configure the T1 cable length settings if necessary, complete the following task in controller configuration mode:

Step Command Purpose

1

Configure the cable length setting by entering one of the following commands:

router(config-controller)# 
cablelength short {133 | 266 | 
399 | 533 | 655}

Configure the cable length if the length is 655 feet or shorter.

router(config-controller)# 
cablelength long {gain26 | 
gain36} {-15db | -22.5db | 
-7.5db | 0db}

Configure the cable length if the length is longer than 655 feet.

Note Depending on the DVM hardware configuration, either the cablelength long command or the cablelength short command is available. Both commands are not available on the same Cisco  MC3810 at the same time.

Configuring T1 Controller Channel Groups (Frame Relay Transport)

Channel groups enable you configure a group of timeslots into a channel group on a T1 controller. Channel groups are required if you will be sending Frame Relay traffic over the T1 controller.

To configure a T1 controller channel group, enter the following command in controller configuration mode:

Step Command Purpose

1

router(config-controller)# 
channel-group channel-no 
timeslots timeslot-list speed 

{56 | 64}

Configure a channel group for specific timeslots. This step is required for Frame Relay traffic. Make sure to set the speed to handle the largest throughput required for Frame Relay.

Note If you specify 56 kbps, the channel group is limited to 14 channels on the Cisco MC3810 MFT. Because 56 is the default, you should specify 64 if you need more than 14 channels.

Configuring TDM Cross-Connect (Data Pass-Through)

Using the time-division multiplexing (TDM) cross-connect function, you can perform cross-connect in one of two situations:

To configure TDM cross-connect, complete the following steps in controller configuration mode:

Step Command Purpose

1

To configure a TDM channel group, do one of the following:

router(config-controller)# 
tdm-group tdm-group-no timeslot 
timeslot-list [type {e&m | fxs 
[loop-start | ground-start] | 
fxo [loop-start | 
ground-start]}]

Configure a TDM channel group for T1. If configuring cross-connect for data traffic only, do not specify the type option. The type option only applies if the mode cas command is enabled.

router(config-controller)# 
tdm-group tdm-group-no timeslot 
timeslot-list [type {e&m | fxs 
[loop-start | ground-start] | 
fxo [loop-start | ground-start] 
| fxs-melcas | fxo-melcas | 
e&m-melcas}]

Configure a TDM channel group for E1. The "melcas" options are supported only on E1 and apply to the Mercury Exchange Limited (MEL) Channel Associated Signaling (CAS) standard, used primarily in the United Kingdom. The MEL options help preserve CAS integrity on the line. If configuring cross-connect for data traffic only, do not specify the type option. The type option only applies if the mode cas command is enabled.

2

router(config-controller)# 
exit

Exit controller configuration mode.

3

Do one of the following in configuration mode, depending on the cross-connect operation you are configuring:

router(config)# cross-connect 
id controller-1 tdm-group-no-1 
controller-2 tdm-group-no-2

Configure cross-connect pass-through between two controllers.

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 TDM cross-connect configuration.

Note If configuring cross-connect pass-through from UIO serial port 0 or 1 to a controller, you must configure the encapsulation clear-channel on the serial port.

Configuring ISDN BRI Backup

The Cisco MC3810 provides an ISDN Basic Rate Interface (BRI) that can be used as a backup interface for data only. The standard Cisco IOS ISDN implementation is supported with the following exceptions:

For more information about standard Cisco ISDN BRI configuration, see the Dial Solutions Configuration Guide.

Note When the BRI backup interface is active, only one channel group can be supported. In this case, a single Frame Relay or ATM channel group is supported. However, no voice groups or TDM groups can be supported when the BRI backup interface is active.

To configure the ISDN BRI backup interface, complete the following steps beginning in global configuration mode:

Step Command Purpose

1

router(config)# isdn 
switch-type switch-type

Configure the global ISDN switch type to match the service provider switch type. For a list of keywords, refer to Table 3-2.

2

router(config)# isdn tei 
[first-call | powerup]

Configure when the ISDN Terminal Endpoint Identifier (TEI) negotiation occurs. The first-call option is primarily used in European ISDN switch types, such as NET3 networks. The powerup option should be used in most other locations.

3

router(config)# interface bri 0

Enter interface configuration mode for the BRI backup interface.

ISDN BRI backup is supported only on interface bri 0.

4

router(config-if)# ip address 
ip-address mask

Enter the IP address and subnet mask for the BRI backup interface.

5

Configure the appropriate encapsulation on the BRI backup interface by entering one of the following:

router(config-if)# 
encapsulation ppp

Enable Point-to-Point Protocol (PPP) encapsulation on the BRI backup interface.

router(config-if)# 
encapsulation frame-relay

Enable Frame Relay encapsulation on the BRI backup interface.

router(config-if)# 
encapsulation hdlc

Enable High-Level Data Link Control (HDLC) encapsulation on the BRI backup interface.

6

router(config-if)# isdn 
switch-type switch-type

Configure the interface ISDN switch type to match the service provider switch type. The interface ISDN switch type overrides the global ISDN switch type on the interface.

For a list of keywords, refer to Table 3-2.

7

router(config-if)# isdn answer1 
[called-party-number]

[:subaddress]

(Optional) Configure called party number verification, to verify a called-party number or subaddress number in the incoming setup message.

8

router(config-if)# isdn 
not-end-to-end [56 | 64]

(Optional) Configure the speed for incoming calls recognized as not ISDN end-to-end.

9

router(config-if)# isdn 
fast-rollover-delay seconds

(Optional) Configure a fast rollover delay.

10

router(config-if)# isdn 
sending-complete

(Optional) Configure the BRI backup interface to include the Sending Complete information element in the outgoing call Setup message. Used in some geographic locations, such as Hong Kong and Taiwan, where the sending complete information element is required in the outgoing call setup message.


Table 3-2: ISDN Switch Types
Country ISDN Switch Type Description

Australia

basic-ts013

Australian TS013 switches

Europe

basic-1tr6

German 1TR6 ISDN switches

basic-nwnet3

Norwegian NET3 ISDN switches (phase 1)

basic-net3

NET3 ISDN switches (UK and others)

vn2

French VN2 ISDN switches

vn3

French VN3 ISDN switches

Japan

ntt

Japanese NTT ISDN switches

New Zealand

basic-nznet3

New Zealand NET3 switches

North America

basic-5ess

AT&T basic rate switches

basic-dms100

NT DMS-100 basic rate switches

basic-nil1

National ISDN-1 switches

Verifying the Configuration

To verify the ISDN BRI interface configuration, complete the following steps in privileged EXEC mode:

Command Purpose

1

router# show interfaces bri 0

Display information about the physical attributes of the ISDN BRI B and D channels.

2

router# show controllers bri 0

Display protocol information about the ISDN B and D channels.

3

router# show isdn {active | 
history | memory | status | 
timers}

Display information about calls, history, memory, status, and Layer 2 and Layer 3 timers.

4

router# show dialer interface 
bri number

Obtain general diagnostic information about the specified interface.


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Posted: Mon Feb 22 10:36:04 PST 1999
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