IXIA OC12c/OC3c Load Modules

This chapter provides details about OC12c/OC3c family of load modules specifications and features.

The OC12c/OC3c family of load modules implements Optical Carrier interfaces that may run at OC12 or OC3 speeds. Both interfaces operate in concatenated mode, as opposed to channelized mode. Different numbers of ports and interfaces are available for the different board types. 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.

One of the modules in this family, the LMOC12c, is shown in the following figure.

Figure: LMOC12c Load Module

Part Numbers

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

Part Numbers for OC12c/OC3c Modules
Load Module Price List Description

LMOC12c/LMOC3c

LMOC12c

2-port multilayer OC12c/OC3c SR-1 POS/SDH, 1310nm multimode

 

LMOC12cSM

2-port multilayer OC12c/OC3c SR-1 POS/SDH, 1310nm singlemode

Specifications

The load module specifications are contained in the following table. The limitations of -3, Layer 2/3 and Layer 7 cards are discussed in Ixia Load Modules.

OC12c/OC3c Load Module Specifications
  LMOC12cLMOC12cSM

# ports

2

-3 Card Available

N

Layer2/Layer3 Card Available?

N

Layer 7 Card Available

N

Data Rate

1-100% of OC12/OC3 speeds (See note 3)

Connector

SC-Singlemode or Multimode

Capture buffer size

16MB

Captured packet size

OC3: 49 - 5,120 bytesOC12: 49 - 15,500 bytes (See note 1)

Streams per port

255

Flows per port

N/A

Preamble Size: min-max

N/A

Frame size (transmit): min-max

34-65,536 bytes (See note 4)

Frame size (receive): min-max

12-65,536 bytes (See note 5)

Inter-frame gap: min-max

N/A

Inter-burst gap: min-max

1ms - 85secs

Inter-stream gap: min-max

1ms - 85secs

Latency

20ns resolution (See note 2)

  1. Captured Packet Size Note: At 100% line rate. Smaller values are possible at lower line rates.
  2. Requires that packets be larger than 70 bytes when operating at full line rate.
  3. Correct data rates can only be maintained with a minimum number of packets, depending on packet size. For OC12 operation, the numbers of packets are required for the indicated ranges of packet sizes:

    OC12 Minimum Number of Packets
    Packet Size Minimum Number of Packets per Stream

    45 or less

    30

    46 - 47

    8

    48 - 54

    7

    55 - 63

    6

    64 - 84

    5

    85 - 129

    4

    130 - 199

    3

    200 - 499

    2

    500+

    0

  4. For OC3 operation, the numbers of packets are required for the indicated ranges of packet sizes:

    OC3 Minimum Number of Packets
    Packet Size Minimum Number of Packets per Stream

    34 or less

    4

    35 - 64

    3

    65 - 274

    2

    275+

    0

  5. The maximum frame size depends on the type of header and PPP negotiation. The maximum frame size is 64k bytes although beyond 8192 bytes, the data is repeated.
  6. 12 byte frames cannot be received back-to-back. A 34 byte frame is required to receive back-to-back frames.

Port LEDs

Each OC12c/OC3c port incorporates a set of 4 or 6 LEDs, as described in the following table.

LMOC12c Port LEDs
LED Label Usage

LOS

Red during Loss of Signal.

LOF

Red during Loss of Frame.

Error

Red on any POS error.

Tx

Green while data is transmitted.

Rx

Green while data is received.

Trig

Follows the state of the Trigger Out pin.

Trigger Out Values

The signals available on the trigger out pins for all cards in this category are described in the following table.

OC12c/OC3c Trigger Out Signals
Pin Signal

1

Port 1: 10 ns high pulse for each packet matching User Defined Statistic 1

2

Port 2: 10 ns high pulse for each packet matching User Defined Statistic 1

3

Port 1: Low during transmit of frame, otherwise high

4

Port 2: Low during transmit of frame, otherwise high

Optical Specifications

The optical characteristics for the OC12c/OC3c cards are described in the following table.

LMOC12c Optical Specifications
Specification OC12c/OC3c Multimode OC12c/OC3c Singlemode

Average Output Power–Minimum/Maximum

-19 dBM/-14 dBM

-15 dBM/-8 dBM

Transmit Center Wavelength–Minimum/Maximum

1270 nm/1380 nm

1293 nm/1310 nm

Receive Center Wavelength–Minimum/Maximum

1270 nm/1380 nm

1200 nm/1550 nm

Receive Sensitive–Minimum/Maximum

-26 dBM/-14 dBM

-28 dBM/-5 dBM

Safety

Led based

Class 1 Laser

Statistics

Statistics for OC12c cards, under various modes of operation may be found in Statistics for OC12c/OC3c Modules.