IXIA OC12 ATM/POS Load Modules

This chapter provides details about OC12 ATM/POS (LM622MR) load module specifications and features.

The OC12 ATM/POS (LM622MR) load module enables high performance testing of routers and broadband aggregation devices such as DSLAMs and PPP termination systems. The board accommodates pluggable PHYs: The features available for these load modules are included in the Port Features by Port Type matrix, which is located on the ixiacom.com website under Support/User Guides/Spreadsheets.

The LM622MR load module is shown in the following figure.

Figure: LM622MR Load Module with Pluggable PHYs Installed

Part Numbers

The currently available part numbers are shown in the following table. Items without a Price List Names entry are no longer available.

Currently Available ATM/POS Modules
Load Module Part Number Description

LM622MR

LM622MR

2-port ATM/Packet over SONET Load Module. Supports 622 and 155 Mbps data rates. Requires the purchase of 2 PHY modules (OC3OC12PHY or OC3OC12PHY-SFP) and the OPTATMMR and/or OPTPOSMR operational mode option.

LM622MR-512

LM622MR-512

2-port ATM/Packet over SONET Load Module. Supports 622 and 155 Mbps data rates. Requires the purchase of 2 PHY modules (OC3OC12PHY or OC3OC12PHY-SFP) and the OPTATMMR and/or OPTPOSMR operational mode option.

OPTATMMR

ATM operational mode option for LM622MR.

OPTPOSMR

OC12c/OC3c Packet over SONET (POS) operational mode option for LM622MR.

OC3OC12PHY

Single-port OC-3/OC-12 PHY module for the ATM/Packet over SONET Load Module. 1310 nm multimode optics with dual SC connectors.

OC3OC12PHY-SFP

Single-port OC-3/OC-12 PHY module for the ATM/Packet over SONET Load Module. Requires one SFP pluggable transceiver (not included).

SFP-OC12MM1310D

Multirate (OC-3, OC-12) SFP transceiver. 1310 nm, multimode with dual LC connectors. Supports diagnostic features.

SFP-OC12SM1310D

Multirate (OC-3, OC-12) SFP transceiver. 1310 nm, single mode with dual LC connectors. Supports diagnostic features.

OC12 POS 622 Specifications

The OC12c POS specifications for the LM622MR load module are contained in the following table.

OC12c POS Specifications for LM622MR Load Module
  LM622MR LM622MR-512

# ports

2

2

Data Rate

1-100% of OC12/OC3 speeds

1-100% of OC12/OC3 speeds

Connector

Changeable physical interface (PHY) per port:

  • SC connectors for 1310 nm multimode
  • SFP socket for SFP-LC module
PHY clock-in and clock-out:
  • SMA connectors.

Changeable physical interface (PHY) per port:

  • SC connectors for 1310 nm multimode
  • SFP socket for SFP-LC module

PHY clock-in and clock-out:

  • SMA connectors.

CPCU RAM

256

512

Capture buffer size

8 MB

8 MB

Captured packet size

34 - 65535 bytes

34 - 65535 bytes

Streams per port

255 Packet Streams

255 Packet Streams

Advanced streams

160

160

Frame size: min-max

35 - 65536 bytes (at full line rate)12 - 65536 bytes (otherwise)

35 - 65536 bytes (at full line rate)12 - 65536 bytes (otherwise)

Inter-frame gap: min-max

1 ms - 4.294967 secs

1 ms - 4.294967 secs

Inter-burst gap: min-max

1 ms - 4.294967 secs

1 ms - 4.294967 secs

Inter-stream gap: min-max

1 ms - 4.294967 secs

1 ms - 4.294967 secs

Latency

20 ns resolutionMinimum frame size of 33 bytes is required.

20 ns resolutionMinimum frame size of 33 bytes is required.

ATM Specifications

The ATM load module specifications for the LM622MR are contained in the following table.

ATM Load Module Specifications
  LM622MR/LM622MR-512

# ports

2

Data Rate

0-100% of OC-12/OC-3 speeds

Connector

Changeable physical interface (PHY) per port:

  • SC connectors for 1310 nm multimode
  • SFP socket for SFP-LC module

PHY clock-in and clock-out:

  • SMA connectors.

Capture buffer size

8 MB

Captured packet size

49 - 64K bytes (Note 1)

Streams per port

4096 shared by 15 interleaved transmit engines

Frame size: min-max

40 - 65,536 bytes (Note 1)

Latency

20 ns resolution

(Note 1) ATM ports transmits a packet of 65568 bytes, including the header. The receive buffer, however, is restricted to 65536 bytes. The last 32 bytes of a maximum size packet is not visible in the capture buffer.

ATM related specifications are detailed in the following table.

ATM Specifications
Parameter Specification

Encapsulation

  • LLC/SNAP Routed Protocol
  • LLC/NLPID Routed Protocol
  • LLC Bridged Ethernet/802.3
  • LLC Bridged Ethernet/802.3 without FCS
  • LLC Encapsulated PPP
  • VC Mux Routed Protocol
  • VC Mux Bridged Ethernet/802.3
  • VC Mux Bridged Ethernet/802.3 without FCS
  • VC Multiplexed PPP

Virtual Circuits

65,536 VC ids distributed among 4,096 unique streams

Cell Header Format

UNI or NNI per port

ATM Framing

AAL5, Constant Bit Rate (CBR) or Unspecified Bit Rate (UBR)

Physical Interfaces

Two pluggable physical interfaces are available for the ATM card:

Port LEDs

Each OC12c/OC3c port incorporates a set of 6 LEDs, as described in the following table.

LMOC12c Port LEDs
LED Label Usage

LOS

Red during Loss of Signal and green otherwise.

LOF

Red during Loss of Frame and green otherwise.

Tx

Green while data is transmitted and blank otherwise.

Rx

Green while data is received and blank otherwise.

Err

Red on any receive error and blank otherwise.

Trig

Blank reserved for future use.

Statistics

Statistics for ATM/POS cards, under various modes of operation, may be found in Statistics for ATM Modules.