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The 8-Port T1 and E1 IMA Port Adapters

The 8-Port T1 and E1 IMA Port Adapters

This chapter describes the 8-port T1 and E1 inverse multiplexing over ATM (IMA) port adapter that is supported in the following systems:

This chapter includes the following sections:

Overview of the T1 and E1 IMA Port Adapters

The T1 and E1 inverse multiplexing over ATM (IMA) port adapters use IMA technology to aggregate multiple low-speed links into one larger virtual trunk or IMA group. An inverse multiplexer appears to your ATM switch router as one logical pipe. IMA provides you with modular bandwidth to access the ATM network between T1 or E1 and T3 or E3 rates.

IMA requires inverse multiplexing and demultiplexing of ATM cells in a cyclical fashion among links grouped to form higher bandwidth logical group with a rate approximately the sum of the link rates. This is called an IMA group. You can combine up to a maximum of eight T1 and E1 lines to form an IMA group.

The T1 and E1 IMA port adapters have eight ports. You can use the eight ports on the T1 and E1 IMA port adapters as independent ATM links or in the IMA mode as follows:

The T1 (1.544 Mbps) and E1 (2.048 Mbps) IMA port adapters provide trunk connectivity and are used for intercampus or wide-area links. The T1 and E1 IMA port adapters support UTP connectors.

Note The T1 and E1 IMA port adapters support up to eight interfaces and therefore must operate with feature card per-flow queuing (FC-PFQ) on the processor card. The T1 and E1 IMA port adapters cannot operate with feature card per-class queuing (FC-PCQ) on the processor card. FC-PCQ and FC-PFQ are two types of daughter cards for the processor card. FC-PCQ provides a subset of the ATM Forum traffic management features provided by FC-PFQ. Refer to the Processor Installation Guide for additional information.

Interface Ports Supported

The ATM switch supports any port adapter combination required. Table 10-1 identifies the maximum number of T1 and E1 IMA interface ports supported in each system.


Table 10-1: Maximum Interface Ports Supported by System Type
System Type Max. No. of T1 and E1
Interface Ports

Catalyst 8510 MSR

64

Catalyst 5500

64

LightStream 1010

64

Note The Catalyst 8540 MSR does not support the 8-port T1 and E1 IMA port adapter.

Figure 10-1 shows a T1 IMA trunk port adapter that supports UTP connectors.


Figure 10-1: T1 IMA Trunk Port Adapter with UTP Connectors


ATM Connections Supported

The T1 and E1 IMA port adapters provide ATM connectivity to the WAN through T1 and E1 lines. The T1 and E1 IMA port adapters combine up to eight T1 and E1 lines to form a virtual connection with another ATM switch or an edge device such as a router.

The T1 and E1 IMA port adapters allow you to use multiple T1 and E1 lines to connect remote sites with smaller bandwidth requirements to the corporate ATM backbone as shown in Figure 10-2. Using IMA functionality, you can switch data, voice, and video between different remote sites and the central office.


Figure 10-2: T1 and E1 IMA Port Adapter ATM Connections


Note For IMA functionality, you must connect the 8-port T1 and E1 IMA port adapters with another device in the network that supports inverse multiplexing over ATM. If a port is configured as an independent ATM link, you must connect it to another device in the network that supports ATM over T1. The IMA implementation on T1 and E1 IMA port adapter is based on the ATM Forum specification version 1.0 (AF-PHY-0086.000). You must connect the 8-port T1 and E1 IMA port adapters with other IMA devices in the network that are also based on the ATM Forum specification version 1.0.

Regulatory Approvals and Compliances

The T1 IMA port adapter meets the following regulatory approvals:

JATE Approval

The T1 IMA port adapter meets Japan Approvals Institute for Telecommunications Equipment (JATE) approval. See Table 10-2 for JATE approval details for the T1 IMA port adapter.


Table 10-2: JATE Approval for the T1 IMA Port Adapter
Applicant Name Model No. Approval No. Date of Approval

Nihon Cisco Systems

C85MS-8T1-IMA

D99-0386-JP

June 22, 1999

FCC Part 68 Notice

The T1 IMA port adapter complies with Part 68 of the FCC rules. On the tray of this equipment is a label that contains, among other information, the FCC registration number. If requested, this information must be provided to the telephone company.

This equipment cannot be used on telephone company-provided coin services. Connection to the Party Line Service is subject to state tariffs.

If this equipment causes harm to the telephone network, the telephone company notifies you in advance that temporary discontinuance of service might be required. If advance notice is not practical, the telephone company notifies you as soon as possible. Also, you are advised of your right to file a complaint with the FCC if you believe it is necessary.

The telephone company can make changes in its facilities, equipment, operations, or procedures that could affect the operation of the equipment. If this happens, the telephone company provides advance notice so you can make the necessary modifications to maintain uninterrupted service.

If trouble is experienced with this equipment, please contact us for repair and warranty information. If the trouble is causing harm to the telephone network, the telephone company can request that you remove the equipment from the network until the problem is resolved.

We recommend that you install an AC surge arrestor in the AC outlet to which this device is connected. This is to avoid equipment damage caused by local lightning strikes and other electrical surges.

This equipment uses Uniform Service Order Code (USOC) jacks as shown in Table 10-3.


Table 10-3: USOC Jacks for the T1 IMA Port Adapter
Model No. Facility Interface Code Service Order Code Jack Type

C85MS-8T1-IMA

04DU9-BN

6.0N

RJ48c

C85MS-8T1-IMA

04DU9-DN

6.0N

RJ48c

C85MS-8T1-IMA

04DU9-IKN

6.0N

RJ48c

C85MS-8T1-IMA

04DU9-ISN

6.0N

RJ48c

CS-03 Certification

The T1 IMA port adapter is CS-03 certified. Observe the following general information and safety precautions:

Warning Do not attempt to make such connections yourself. Contact the appropriate electric inspection authority or electrician as appropriate.

Refer toTable 10-4 for CS-O3 approval details for T1 IMA port adapter.


Table 10-4: CS-O3 Approvals for the T1 IMA Port Adapter
Model No. Certificate No. Date

C85MS-8T1-IMA

2461 9805 A

3/31/99

Cabling the T1 and E1 IMA Port Adapters

This section describes supported cabling configurations for the T1 (1.544-Mbps) and E1 (2.048 Mbps) IMA port adapters, which provide T1 and E1 UTP connections.

Note All ATM interfaces are full duplex. You must use the appropriate ATM interface cable to connect the ATM UTP port adapter interface with an external ATM network.

T1 and E1 IMA Port Adapter Supported Interfaces

The T1 and E1 IMA port adapters provide an interface to ATM switching fabrics for transmitting and receiving data at approximately N x 1.544 Mbps and N x 2.048 Mbps bidirectionally for an IMA group on N links. The actual data rate is determined by the physical layer interface module (PLIM). The T1 and E1 IMA port adapters support interfaces that connect to the following physical layers:

Note The terms RJ-45 connector and RJ-48c connector are sometimes used interchangeably. The RJ-48c is the jack or receptacle; the RJ-45 is the plug.
Note For detailed descriptions of ATM cabling requirements, see the "ATM Connection Equipment Requirements" section.

T1 and E1 IMA Port Adapter Trunk Connectors

For T1 and E1 trunks, use an RJ-48 connector and UTP cable to connect the T1 and E1 IMA port adapters with the WAN or other switches that support IMA technology. (See Figure 10-3.)

Note For a description of these connectors, see the "ATM Connection Equipment Requirements" section. (Figure 2-4 shows an RJ-48 connector.)

Figure 10-3: T1 and E1 IMA Trunk Connections and LEDs


If you need E1 75-ohm BNC connections, use the 8-port E1 120-ohm IMA port adapter with an adapter cable as shown in Figure 10-4. Use model number CAB-ADPT-75-120= to order the adapter cable.You need up to eight adapter cables per E1 120-ohm IMA port adapter. You can use straight-through T1 and E1 cables with RJ-45 plugs to connect between the ports on the 8-port E1 120-ohm IMA port adapter and the adapter cable. Use a cable management bracket with 16-F-F BNC connections as shown in Figure 10-4 to organize the cables leading to the spare adapter. Use model number CAB-MGT-16BNC= to order the cable management bracket. For additional information on the 75-120-ohm adapter cable see the "E1, CES E1, DS3, E3, and CDS3 Connections" section.


Figure 10-4: Adapter Cable for E1 75-ohm BNC Connections with a Cable Management Bracket


T1 and E1 IMA Port Adapter LEDs

The LEDs provide status information for the individual T1 and E1 interface connections. The LEDs are shown in Figure 10-3 and described in Table 10-5.


Table 10-5: T1 and E1 IMA Port Adapter LED Descriptions
LED State Description

PWR (power)

Off
Green

power down
power up

CD (carrier
detect)

Off
Green

Carrier detect signal not received
Carrier detect signal received

Note The default state of the CD LED is OFF. The CD LED will glow green only when the cable is connected and the port is not in shutdown state.

RX (receive)

Off
Flashing green

Flashing yellow
Red

No receive line activity
Cells being received: blinks every five seconds and
pulse rate increases with data rate
Loopback
Alarm (LOF1, LCD2, AIS3)

TX (transmit)

Off
Flashing green
Flashing yellow
Steady yellow

No transmit line activity
Cells being transmitted: pulse rate increases with data rate
Loopback
Alarm FERF4

FAIL

Off
Blinking red

Red

Card is ok
Card is booting up; blinks for about 45 seconds during the boot up stage.
Card failed

1LOF = loss of frame
2LCD = loss of cell delineation
3AIS = alarm indication signal
4FERF = far-end receive failure


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Posted: Fri Nov 5 09:31:21 PST 1999
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