Cisco ISE - Line Card ISE Uživatelský manuál stáhnout pdf (Strana 12)

Cisco IOS SoftwareConfiguration for theCisco 12000 SeriesOne-Port Channelized OC-12/STM-4(DS1/E1) ISE Line

How to Configure Layer 1 Features

Cisco IOS Release 12.0(27)S1

Configuring an STS-1 Mode of Operation with SONET Framing

Under SONET framing, each of the STS-1 paths can be configured to carry a set of T1s mapped into

either a VT1.5 signal or a DS3 signal. The DS3 signal itself carries a set of T1s (thus becoming a

channelized T3, or CT3).

Summary Steps

1. controller sonet slot/port

2. framing sonet {sonet | sdh}

3. sts-1 number

4. mode {vt-15 | ct3}

Detailed Steps

Command Purpose

Step 1

controller sonet slot/port

Example:

Router(config)# controller sonet 1/0

Selects the physical port to configure.

Enters controller configuration mode.

Step 2

framing sonet {sonet | sdh}

Example:

Router(config-controller)# framing sonet

Specifis framing type. Choose SONET for STS-1

configuration.

Step 3

sts-1 number

Example:

Router(config-controller)# sts-1 3

Legal sts-1 number values are 1 to 12.

Enters STS-1 path configuration mode.

From the STS-1 path configuration mode, you can

configure the mode of operation to be vt-15

(Virtual Tributary Group structure VT1.5, which

is used for DS1 transport) or ct3 (channelized T3).

Step 4

mode {vt-15 | ct3}

Example:

Router(config-ctrlr-sts1)# mode vt-15

Selects the STS-1 mode of operation.

Default is ct3.

DS1 signals are multiplexed in one of two

methods: Virtual Tributary Group (VTG) structure

VT1.5 mapping, which is used for DS1 transport,

or T1 PDH M13 mapping (channelized T3, or

CT3), which multiplexes DS1 signals

asynchronously to form a DS3 signal.

When you select ct3, the specified STS-1 will

carry a DS3 signal divided into 28 T-1s

(multiplexed asynchronously). .

When you select vt-15, the specified STS-1 is

divided into seven virtual tributary groups

(VTGs). Each of those VTGs is then divided into

four VT1.5s, each carrying one T1. .

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