Cisco OSM-12CT3/T1 - Optical Services Module... Guida rapida

CHAPTER

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Configuring the Channelized 12-port CT3/T1

Optical Services Modules

This chapter describes how to configure the 12-port channelized/unchannelized DS3 Optical Services

Modules (OSM-12CT3/T1).

The chapter consists of these sections:

•Understanding the Channelized/Unchannelized CT3/T1 Modules, page 7-1

•Supported Features, page 7-2

•Configuring the Interfaces, page 7-6

Understanding the Channelized/Unchannelized CT3/T1 Modules

The OSM-12CT3/T1 module provides 12DS3 interface connections using mini-SMB connectors.

Each DS3 port can be independently configured all the way from a clear channel DS3 down to and

including DS1, E1,and DS0 connections on the same port, with a maximum of 128 channels per DS3

port.

Each OSM-12CT3/T1 can support any combination of DS3/DS1/E1/T1s up to 1023 channels. For

example, each port can support the following:

•1 DS3 at 44.7 Mbps

•21 E1s at 2.048Mbps

•28 DS1s at 1.5 Mbps

•128 DS0s at 64 Kbps

An unchannelized DS3 connection provides a single serial interface data channel that may be configured

to use all of the DS3 bandwidth or a fractional portion of it. This mode is compatible with several

vendors of fractional (subrate) DS3 data service units (DSUs).

A cost, depending on the bandwidth, is associated with a serial interface. The total cost possible for 12 DS3

ports is 4096. That is, the sum of the costs of all the serial interfaces configured on 12 DS3 ports must be no

more than 4096. The show controller t3 command displays the VC cost, which indicates the available cost

of 12 DS3 ports. Table 7-1 shows the cost associated with each link type.

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Supported Features

Table 7-1 Serial Interface Cost

Channelized DS3 Overview

In the channelized mode of operation, an OSM-12CT3/T1 link is channelized into 28 DS1 or 21 E1 data

lines in an industry standard multiplexing format.

Each of the DS1 lines contain 24 timeslots of 64 or 56 kbps each, and each of the E1 lines contain 32

timeslots of 64 or 56 kbps each. The DS1and E1 lines can support one or more user data channels which

appear to the system as serial interfaces. Each serial interface is assigned one or more of the timeslots

giving the serial interface a bandwidth of n x 56 kbps or n x 64 kbps, where n is the number of timeslots

assigned. Any unused timeslots of the lines are filled with an idle channel pattern.

Unchannelized DS3 Overview

In the unchannelized mode of operation, a DS3 link provides a single high speed user data channel,

rather than being multiplexed into 28 DS1 or 21 E1 lines. The data channel appears to the system as a

serial interface that may be configured to use the full DS3 bandwidth or a smaller portion of the DS3

bandwidth.

In unchannelized DS3 mode, the OSM-12CT3/T1 supports the maintenance data link (MDL) channel

when using c-bit parity framing as well as local and network loopbacks.

Supported Features

The 12-port channelized/unchannelized DS3 OSMs support the following features:

•General Features, page 7-3

•Serial Encapsulation Protocols, page 7-3

•DSU Mode, page 7-4

•T1 Configuration Options, page 7-4

•E1 Configuration Options, page 7-4

•DS3 Alarms, page 7-5

•Network Management, page 7-5

•Quality of Service Protocols, page 7-5

Link Type Cost

DS3 336

Unframed E1 16

1-6 DS-/TS 4

7-9 DS0/TS 6

10-16 DS0/TS 8

17-24 DS0/TS 12

25-31 TS 16

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Supported Features

General Features

The general features are as follows:

•Channelized DS3 with 28 DS1 lines or 21 E1 lines multiplexed into a DS3 line.

•C-bit parity, M23, and auto-detect framing.

•Internal clocking configurable.

•Bit error rate test (BERT) diagnostics for each DS-3 channel

•Local, line, and remote loopback.

•Generation and termination of DS-3 maintenance data link (MDL) in C-bit framing.

•Compliance with ANSI T1.231-1993, Bellcore GR820, ANSI T1.107, ANSI T1.403 1989, G.703

Section 2, G.704 Section 3, AT&T Pub. 62411 1990, and Facilities Data Link (ANSI T1.403 and

AT&T 54016).

Serial Encapsulation Protocols

The OSMs support for the following serial encapsulation protocols:

•Point-to-Point Protocol (PPP)

•Distributed Multilink PPP (dMLPPP)

The OSM-12CT3/T1 module supports dMLPPP, which means that the MLPPP encapsulation is

performed on the OSM-12CT3/T1 module rather than the route processor. The following dMLPP

features are supported:

–

336 bundles per module

–

A maximum of 12 DS1/E1 channels per bundle

–

All links in a bundle should operate at the same speed

–

100 ms of differential delay

•High-Level Data Link Control (HDLC)

•Frame Relay

Configure the OSM-12CT3/T1 interfaces for Frame Relay as described in the Cisco IOS Wide-Area

Networking Configuration Guide, Release 12.1 under “Configuring Frame Relay” and in the Cisco

IOS Wide-Area Networking Command Reference, Release 12.1 at:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_c/wcdfrely.htm

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_r/wrdfrely.htm

Configure traffic shaping for Frame Relay as described in the Cisco IOS Quality of Service

Solutions Configuration Guide under “Configuring Distributed Traffic Shaping” at:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt4/qcfdts.h

tm.

For information on Multilink Frame Relay (FRF.16), see •Multilink Frame Relay (FRF.16),

page 1-4.

•MPLS/VPN

For MPLS/VPN configuration information, see Chapter 9, “Configuring Multiprotocol Label

Switching on the Optical Services Modules.”

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Supported Features

DSU Mode

Unchannelized DS-3 supports subrate and scrambling formats for the following DSUs.

•Digital Link

•Ve r i l i n k

•Adtran

•Larscom

•Kentrox

T1 Configuration Options

The T1 lines have the following configuration options:

•Local, line, and remote loopback.

•Generation and termination of DS-3 maintenance data link (MDL) in C-bit framing.

•In T1 mode, the channelized CT3/T1 OSMs support facilities data link (FDL) in Extended

Superframe (ESF) framing, as well as various loopbacks. Bit error rate testing (BERT) is supported

on each of the T1 lines. It can be done over a framed or unframed DS-1 signal. The

OSM-ChOC12C/T1 module has four framers, each connected to three contiguous ports. BER testing

can be done simultenously on 6 T1 interfaces in addition to any DS3 interfaces configured on the

three ports to which a framer is connected.

•In the channelized mode of operation, a channelized CT3/T1 OSM link can be channelized into

maximum of 336 T1 data lines in an industry standard multiplexing format. Each of the T1 lines

contains 24 timeslots of 64 or 56 kbps each. The T1 lines can support one or more user data

channels, which appear to the system as serial interfaces. Each serial interface is assigned one or

more of the timeslots giving the serial interface a bandwidth of nx 56 kbps or n x 64 kbps, where n

is the number of timeslots assigned. Any unused timeslots of the T1 are filled with an idle channel

pattern.

E1 Configuration Options

The E1 lines have the following configuration options:

•Channelized E1—Any of the 21 E1 lines can be configured as channelized E1 lines, but you are

limited to a total of 128 logical channels. You can group the time slots in these E1 lines into several

individual logical channel groups, each of which carries data with different data link layer protocol

encapsulations. You can configure timeslot 16 as a data channel, although it is typically used for

common channel signaling. (Channel associated signaling (CAS) for voice channels and E1

Facilities Data Link [FDL] on timeslot 16 are not supported.)

•Each logical channel group can be composed of individual 64-kbps timeslots and/or ranges of

timeslots, for example, 1, 9, 12-14. Each logical channel group can contain from 1-31 timeslots

maximum; the same timeslot cannot be used in more than one logical channel group. Any unused

timeslots are filled with programmable idle-channel data.

•Fractional E1— Any of the 21 E1 lines can be configured as fractional E1 lines, each of which can

be either E1 frames or E1 cyclic redundancy check (CRC) multiframes, as specified by CCITT/ITU

G.704 and G.706. A fractional E1 line is a subset of the full E1 bandwidth, which uses n x 64 kbps;

where nis a timeslot in the range of 1-31.

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Supported Features

Fractional E1 lines contain only a single logical channel group that can be either a single 64-kbps

timeslot or a range of timeslots; for example timeslot 1, or timeslots 15-23. Any unused timeslots

are filled with programmable idle-channel data.

Note If you assign only one channel group to an E1 line, it is a fractional E1 line. If you assign

more than one channel group to an E1 line, it is a channelized E1 line.

•Unframed E1—Any of the 21 E1 lines can be configured as unframed E1 data lines. Each unframed

E1 line contains no framing overhead and is not timeslot divided.

Note For channelized, fractional, and unframed configurations each configured channel group, which might

contain individual timeslots and/or ranges of timeslots, uses only one of the 128 available logical

channels. For example, if you assign the range of timeslots 3-7 to a channel group, only one logical

channel is used. Likewise, if you assign just timeslot 3 to a channel group, only one logical channel is

used.

DS3 Alarms

This section lists the supported DS3 alarms:

•Alarm indication signal (AIS)

•Out of frame (OOF)

•Far End Remote Failure (FERF)

•Loss of Signal (LOS)

•Far End Block Errors (FEBE)

•Far-End Alarm and Control (FEAC) support

Network Management

This section lists the supported network management features:

•Local Loopback.

•Network Loopback.

•RFC 1407 MIB support.

Quality of Service Protocols

For information on configuring QoS on the Channelized OSMs, refer to Chapter 10, “Configuring QoS

on the Optical Services Modules.”

The following QoS features are supported on the Channelized OSMs:

•Hierarchical traffic shaping for Frame Relay, HDLC, and PPP encapsulations

•PFC2 QoS on the LAN and WAN ports

•Differentiated Services Control Point (DSCP)

•IP Precedence classification

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Configuring the Interfaces

Configure class-based marking as described in the Class-Based Marking Feature Module at this

URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t5/cbpmark2

.htm

•Classification and priority marking based on the following:

–

Ethertype

–

IP Source Address (SA)

–

IP Destintation Address (DA)

–

TCP port number

–

UDP port number

–

IP SA + TCP/UDP port number + IP DA + TCP/UDP port number

•Class-based weighted fair queuing (CBWFQ) on the WAN ports.

•Low latency queuing (LLQ) on the WAN ports.

For general information on classification, marking, and queuing in IOS, refer to the “Classificiation”

chapter of the Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.1 at this

URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/qos_c/index.htm

For information about platform-independent IOS QoS commands, refer to the Cisco IOS Quality of

Service Solutions Command Reference, Release 12.1at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/qos_r/index.htm

Configuring the Interfaces

This chapter includes these sections:

•Configuring the T3 Controller, page 7-6

•Configuring the Unchannelized DS3 Interface, page 7-7

•Configuring the Channelized DS3 Interface, page 7-9

•Configuring Distributed MLPPP, page 7-11

•Configuring the T1/NxDS0 Lines, page 7-9

•Configuring the E1 Lines, page 7-10

Configuring the T3 Controller

To configure the controller, perform this task:

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Configuring the Interfaces

This example shows how to configure the controller:

Router# configure terminal

Router(config)# controller T3 3/0

Router(config-controller)# no channelized

Router(config-controller)# exit

Router(config)#

Configuring the Unchannelized DS3 Interface

After you verify the controller configuration, you can configure the associated DS3 interfaces.

Command Purpose

Step 1 Router# configure terminal Enters configuration mode and specifies that the

console terminal is the source of the configuration

subcommands.

Step 2 Router(config)# controller t3 slot/port Selects a port and enters controller configuration

mode.

Step 3 Router(config-controller)# [no] channelized [mode {t1

| e1}]

Specifies the channelization mode.

no channelized—configures the interface as

unchannelized.

channelized mode t1—configures the interfaces

for T1 channelized mode

channelized mode e1—configures the interfaces

for E1 channelized mode

Default is t1.

Step 4 Router(config-controller)# [no]bert pattern

[2^11 |2^15 |2^20 O.153 | 2^20 QRSS | 2^23 | 0s |

1s |alt-0-1]interval [1-1440]

(Optional) Configures bit-error-rate (BER)

testing.

Step 5 Router(config-controller)# [no] mdl string {eic | fic |

generator | lic | pfi | port | unit}

(Optional) Specifies the maintenance data link

(MDL) messages.

eic—equipment ID code

fic—frame ID code

generator—generator number in MDL test signal

lic—location ID code

pfi—facility ID code in MDL path message

port—port number in MDL idle string message

unit—unit code

Default is no mdl string.

Step 6 Router(config-controller)# [no] mdl transmit

{path | idle-signal | test-signal}

(Optional) Enables MDL message transmission.

Default is no mdl transmit.

Step 7 Router(config-controller)# t1 1 bert channel-group 0

pattern 2^11 interval 1

(Optional) Configures bit error rate testing on

channel-group 0 (all timeslots under channel

group 0).

Step 8 Router(config-controller)# t1 1 bert timeslots 21,24

pattern 2^11 interval 1

(Optional) Configures bit error rate testing on

timeslots 21 and 24 only.

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Configuring the Interfaces

Note IP addresses can not be assigned to main interfaces configured for Frame Relay.

To configure the unchannelized DS3 interfaces, perform this task:

This is an example of an unchannelized DS3 interface configuration:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# controller t3 3/0

Router (config-controller)# no channelized

Router (config-controller)# exit

Router (config)# interface serial 1/0

Router (config-if)# dsu bandwidth 16000

Router (config-if)# encapsulation ppp

Router (config-if)# no shutdown

Router (config-if)# exit

Router(config)#

Command Purpose

Step 1 Router# configure terminal Enters configuration mode and specifies that the

console terminal is the source of the configuration

subcommands.

Step 2 Router(config)# interface serial slot/port Specifies the serial port to configure.

Step 3 Router(config-if)# framing {c-bit |m23}Specifies the framing.

Step 4 Router(config-if)# [no] dsu bandwidth Kilobits/sec Sets the DSU subrate bandwidth.

Router(config-if)# [no]dsu mode {0 | 1 | 2 | 3 | 4} Specifies the DSU mode:

0–Digital-Link

1–Kentrox

2–Larscom

3–Adtran

4–Verilink

Step 5 Router(config-if)# [no] dsu remote [accept | fullrate]Specifies if the local (near-end) interface will

accept incoming requests from the remote

(far-end) interface, or if the local interface will

request that the remote interface set its bandwidth to

fullrate.

Step 6 Router(config-if)# encapsulation hdlc | ppp Specifies the encapsulation type. HDLC is the

default encapsulation.

Step 7 Router(config-if)# [no] clock source {internal | line}(Optional) Specifies the clock source.

Default is line.

Step 8 Router(config-if)# [no] loopback

{local |network |remote {line |payload}}

(Optional) Sets the loopback mode.

Default is no loopback.

Step 9 Router(config-if)# [no] cablelength feet Specifies the cable length. Default is 224.

Step 10 Router(config-if)# [no] keepalive Turns on and off keepalive messages.

Step 11 Router(config-if)# no shutdown Enables the interface.

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Configuring the Interfaces

Configuring the Channelized DS3 Interface

The DS3 Interface can be channelized down to T1 and E1 links. These sections provide configuration

information for T1 and E1 link configuration:

•Configuring the T3 Controller for Channelization, page 7-9

•Configuring the T1/NxDS0 Lines, page 7-9

•Configuring the E1 Lines, page 7-10

Note Bit error rate testing (BERT) is supported on each of the T1 and E1 lines. It can be done over a framed

or unframed DS-1 signal. The OSM-12CT3/T1 module has four framers, each connected to three

contiguous ports. BER testing can be done simultenously on 6 T1 or E1 interfaces in addition to any DS3

interfaces configured on the three ports to which a framer is connected.

Note BERT channel-groups and timeslots are also supported.

Configuring the T3 Controller for Channelization

To configure the T3 controller for T1 of E1 channelization, perform this task:

This example configures the T3 controller for T1 channelization mode:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# controller T3 2/0

Router(config-controller)# channelized mode t1

Router(config-controller)# CNTL/Z

Router#

Configuring the T1/NxDS0 Lines

To configure T1/NxDS0 lines, perform this task:

Command Purpose

Step 1 Router# configure terminal Enters configuration mode and specifies that the

console terminal is the source of the configuration

subcommands.

Step 2 Router(config)# controller slot/port Selects the controller.

Step 3 Router (config-controller)# [no] channelized [mode {t1

| e1}]

Specifies the channelization mode.

Default is t1.

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Chapter 7 Configuring the Channelized 12-port CT3/T1 Optical Services Modules

Configuring the Interfaces

This example configures a T1/NxDS0 line:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# controller T3 3/1

Router(config-controller)# t1 6 channel-group 0 timeslots 1-5, 20-23

Router(config-controller)# t1 6 framing sf

Router(config-controller)# t1 6 clock source line

Router(config-controller)# t1 6 loopback remote line

Router(config-controller)# t1 6 bert pattern 2^23 interval 5 unframed

Router(config-controller)# exit

Router(config)# interface serial t1 3/1/6:0

Router (config-if)# CNTL/Z

Router#

Configuring the E1 Lines

To configure E1 lines, perform this task:

Command Purpose

Step 1 Router# configure terminal Enters configuration mode and specifies that the

console terminal is the source of the configuration

subcommands.

Step 2 Router(config)# controller t3 slot/port Enters controller configuration mode.

Step 3 Router(config-controller)# [no] t1 t1-number

channel-group channel-group-number timeslots

list-of-timeslots [speed 56 | 64]

Configures the channel group.

Step 4 Router (config-if)# [no] t1 t1-number framing {sf |

esf}

Specifies the framing.

Step 5 Router (config-controller)# [no] t1 t1-number fdl ansi (Optional) Enables the once-second transmission

of the remote performance reports via facility data

link (FDL).

Step 6 Router (config-controller)# [no] t1 t1-number yellow

{detection | generation}

(Optional) Enables detection and generation of T1

yellow alarms.

Step 7 Router (config-controller)# [no] t1 t1-number clock

source {internal | line}

(Optional) Defines clock source for the specified

T1 line.

Step 8 Router (config-controller)# [no] t1 t1-number loopback

{local |network |remote {line fdl {ansi | bellcore}|

payload fdl ansi}}

(Optional) Sets the loopback mode.

Step 9 Router (config-controller)# [no][e1 | t1][e1-number

|t1 number] bert pattern {2^11 |2^15 |2^20 O.153

| 2^20 QRSS | 2^23 | 0s |1s |alt-0-1}interval

[1-1440]

(Optional) Configures bit-error-rate (BER)

testing.

Step 10 Router(config-controller)# exit Exits controller configuration mode.

Step 11 Router(config)# [no] interface serial slot/port/t1

number: channel-group number

Selects the interface and configures the channel

group.

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