IXIA OC48c Load Modules

This chapter provides details about OC48c family of load modules specifications and features.

The OC48c family of load modules implements Optical Carrier interfaces that runs at OC48 speeds. The interface operates in concatenated mode, as opposed to channelized mode. Cards are available that perform Packet Over SONET testing, Bit Error Rate Testing or both. 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 LMOC48c, is shown in the following figure.

Figure: LMOC48c Load Module

Figure: MSM2.5G1-01 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 OC48 Modules
Load Module Part Numbers Description

LMOC48cPOS

LMOC48C

1-port multilayer OC48cSR-1 POS/SDH, 1310nm, singlemode

LMOC48cPOS-M

LMOC48C3

1-port multilayer OC48cSR-1 POS/SDH, 1310nm, singlemode, manufacturing version

LMOC48cBERT

LMOC48311

1-port multilayer OC48cSR-1 SONET/BERT, 1310nm, singlemode

LMOC48312

1-port multilayer OC48cIR-2 SONET/BERT, 1550nm, singlemode

LMOC48cPOS/BERT

LMOC48411

1-port multilayer OC48cSR-1 POS/BERT, 1310nm, singlemode

LMOC48412

1-port multilayer OC48cIR-2 POS/BERT, 1550nm, singlemode

2.5G MSM POS

MSM2.5G1-01

1-port multilayer OC48cSR-1 POS/SDH, 1310nm, singlemode

SW-DCCSONET

DCC SONET support for all modules.

SRP SONET support for all modules.

SW-SRPSONET

SW-RPRSONET

945-0002

SRP SONET and RPR SONET support for all modules

SW-VCAT-SONET

945-0005

SONET Virtual Concatenation (VCAT) option

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.

OC48 Load Module Specifications
  LMOC48c LMOC48cBERTLMOC48cBERTRx LMOC48cPOS+BERT 2.5G MSM POS2

# ports

1

1

1

1

-3/-M Card Available

Y

N

N

N

Layer2/Layer3 Card Available?

N

N/A

N

Y

Layer 7 Card Available

N

N/A

N

N

Data Rate

1-100% of OC48 speeds

2.488 Gbps

1-100% of OC48 speeds

Connector/ Wavelength-Mode

SC/1310nm or 1550nm Singlemode

SC/1310nm Singlemode

SFP/1310nm or 1550nm Singlemode

Capture buffer size

32MB

N/A

Up to 384 MB

Captured packet size

26-65,535 bytes

N/A

17-65,535 bytes

Streams per port

255

N/A

256

Flows per port

N/A

N/A

N/A

Advanced Streams

160

256

Preamble size: min-max

N/A

N/A

N/A

Frame size: min-max

26-65,535

N/A

25-65,535

Inter-frame gap: min-max

N/A

N/A

4.0ns - 42sec in 3.2ns steps

Inter-burst gap: min-max

1ms - 42secs

N/A

4.0ns - 42sec in 10.0ns steps

Inter-stream gap: min-max

1ms - 42secs

N/A

4.0ns - 42sec in 10.0ns steps

Normal stream frame rate

0.023fps - full line rate

0.023fps - full line rate

Advanced streams frame rate3

Slow: 0.023 - 2083333 fpsMed: 95fps - full line rateFast: 1525fps - full line rate

Slow: 0.023fpsFast: 1525fps

Latency

20ns resolution

N/A

20ns resolution

1Refer to the LMOC48cPOS and LMOC48cBERT columns for the characteristics of this card when its port is in POS or BERT mode, respectively.

2Due to power requirements, only one 2.5G MSM POS module can be used in a 400T chassis. Other modules can be used with the 2.5G MSM POS in the same chassis, but only one 2.5G MSM POS at a time.

3Streams are divided up into three categories: 144 slow speed streams, 8 medium streams, and 8 fast streams (excluding the 2.5G MSM POS load module).

OC48c VAR Calibration

This procedure allows the OC48 VAR module's transmission frequency to be varied to test compliance of devices to the limits of the specification.

Frequency Adjustment

The OC48 VAR allows a variation of +/- 100 parts per million (ppm) from the clock source's nominal frequency, through a DC voltage input into the BNC jack marked `DC IN' on the front panel. The variation is from the lowest frequency when DC IN is 0 V, to highest frequency when DC IN is 3.3 V. The input voltage should be used only within this range, although the DC IN circuitry is designed to withstand +/- 30 V in the case of accidental overdrive from a function generator. The input has a single-pole low pass at 16 Hz to keep injected noise from causing a violation of OC48 jitter specifications. As a result, the system should be given 50 to 100 milliseconds to settle after a voltage step at DC IN.

Frequency Monitoring

The frequency may be monitored through the BNC marked `Freq Monitor.' This output provides the OC48 line clock divided by 16. The center frequency is 155.52 MHz. The voltage is 70 mV peak-to-peak into 50 ohms, suitable for direct connection into a frequency counter (such as an HP53181A) through 50 ohm coaxial cable. The frequency counter should be set for 50 ohm termination in a suitably sensitive mode.

Port LEDs

There are two sets of LEDs, one for LMOC-48c load modules and one for MSM OC-48c load modules.

Each OC48c port incorporates a set of LEDs, as described in the following figure.

LMOC48c Port LEDs
LED Label Usage

PPP

Green if a PPP link has been established. Red otherwise.

Option 1

Reserved for future use.

Option 2

Reserved for future use.

LOS

Red during Loss of Signal, Green otherwise.

LOF

Red during Loss of Frame, Green otherwise.

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, which is programmed through User Defined Statistic 1.

Each 2.5G MSM POS port incorporates a set of LEDs, as described in the following table.

MSM2.5G1-01 Port LEDs
LED Label Usage

Trigger

Green if a Trigger A condition occurred, Red if a temperature condition occurred.

Tx

Green if transmit is active and frames are being sent, blank otherwise.

LOS

Green if signal level is good, Red if loss of signal condition is detected, blank if no transceiver is detected.

Error

Red if module is in an error state, blank otherwise.

Rx

Green if valid frames being received, Red if errored frames being received, blank otherwise.

LOF

Green if valid framing exists, Red if loss of frame condition exists.

Trigger Out Values

The signals available on the trigger out pins for legacy OC-48c load modules in this category are described in the following table.

LMOC48c Trigger Out Signals
Pin Signal

1

Always high (no trigger available)

2

Always high (no trigger available)

3

Always high (no trigger available)

4

Always high (no trigger available)

The signals available on the trigger out pins for MSM load modules in this category are described in the following table.

2.5G MSM POS Trigger Out Signals
Pin/LED Value

Trigger Out

10nS active high pulse on trigger.

Trigger LED

Indicates Trigger. This triggers on User Defined Statistic 1.

Optical Specifications

The optical characteristics for the OC48c cards are described in the following table.

LMOC48c Optical Specifications
Specification OC48c Singlemode

Average Output Power–Minimum/Maximum

-10 dBM/-3 dBM

Transmit Center Wavelength–Minimum/Maximum

1266 nm/1360 nm

Receive Center Wavelength–Minimum/Maximum

1260 nm/1580 nm

Receive Sensitive–Minimum/Maximum

-18 dBM/-3 dBM

Safety

Class 1 Laser

Statistics

Statistics for OC48 cards, under various modes of operation may be found in Statistics for OC48c Modules with BERT.