HP 37778A STM-16/OC-48 Test Set

Use the HP 37778A test set to perform non-intrusive monitoring of live traffic and detect alarms simultaneously at the 155 Mb/s (STM-1) and STM-16/OC-48 level. With this test set, users can functionally test synchronous line multiplexers, line regenerators and digital cross-connects. Users can also check the survivability of their network by stress testing all network elements at 2.4 Gb/s.

• Overhead analysis.
• STM-16c/OC-48c bulk mapped payloads.
• 2, 34 and 140 Mb/s payloads.
• 155 Mb/s drop and insert ports for SONET payload testing.
• Error and alarm generation.
• Pointer generation and analysis.
• G.826 analysis.
• Frequency offset and measurement.
• Thru-data mode.
• Jitter generation and analysis

The HP 37778A STM-16/OC-48 test set generates and receives 
optical and electrical signals in accordance with both ITU-T SDH 
and Bellcore SONET standards.

Specifications will depend on option mix.


Payload
Frame formats
SDH: STM-1 and STM-16 to ITU-T G.707.
SONET: OC-48 to GR-253-CORE.

Payload types
Internal: 2, 34 and 140 Mb/s payload mapping via AU-4 to 
ITU-T G.707.  STM-16c/OC-48c bulk filled payloads.
External: External 155 Mb/s drop/insert is provided via 
coded or binary ports for external SDH/SONET payload testing.

Clock sources
Internal: Accuracy ± 4.5 ppm.
Offset: Range ± 999 ppm (requires option A1T module).
External: 2 Mb/s MTS signal.  Received STM-16/OC-48 signal.  
Inserted STM-1/STS-3 signal.

Connectors and interfaces
Connectors
Optical: Customer exchangeable, FC/PC (HP 81000FI) adapters 
are supplied as standard.
Electrical: BNC/small Siemens on all transmit/receive and 
drop/insert ports.

Interfaces
Electrical: 155 Mb/s CMI coded, 2.4 Gb/s ECL clock and data.
Connector type: BNC at 155 Mb/s, SMA at 2.4 Gb/s.
Optical: 155 Mb/s (STM-1 format) and 2.488 Gb/s.
Wavelength: 1310 or 1550 nm.
Average output power: -3 dBm at 1310 nm and -2  dBm at 1550 nm.
Connector type: FC/PC fitted as standard, other connector types 
are available. 

Errors/Alarms
Error addition and detection
SDH at STM-1 and STM-16: A1A2 frame, B1, B2, B3, payload errors. 
SONET at OC-48: A1A2 frame, section BIP, line BIP, path BIP 
and payload errors (concatenated payloads only).

Alarm generation and detection
SDH: LOF, AU-LOP, MS-AIS, MS-RDI, AU-AIS, AU-RDI, TU-LOP, 
TU-AIS, TU-RDI. 
SONET: LOF, SPE-LOP, AIS-S, AIS-L, RDI-L, AIS-P, RDI-P. 
VT level alarms via 155 Mb/s drop/insert ports.

Jitter analysis
As a jitter analyzer, the HP 37778A test set supports testing 2.4 Gb/s 
equipment and systems for compliance with ITU-T G.958 and Bellcore 
GR-253-CORE.

Unless otherwise stated, the following specifications apply to an 
SDH/SONET formatted signal with valid overhead and a scrambled all 
zeros or all ones virtual container.

Jitter generation
Internal modulation: Adds jitter to either an internally 
generated 2^7 PRBS signal or an external 2.4 Gb/s data signal.
Frequency range: 1 Hz to 20 MHz.
Amplitude: Up to 20 UI from 1 Hz to 750 kHz, with roll-off 
each decade to 0.75 UI at 20 MHz.

Jitter mask generation
Jitter tolerance: ITU-T G.958 masks type A and B masks 
are provided. Maximum permissible jitter tolerance is plotted 
automatically against the G.958 mask. User mask generator is 
provided allowing a customized mask of up to 34 points to be 
generated for rms and peak-to-peak ranges.
Jitter transfer: Jitter transfer can be plotted automatically 
for compliance with G.958 and GR-253-CORE.

Declarations of Conformity

This product adheres to European Regulations.

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European Regulatory Declarations of Conformity.

Choose between Overhead and BER analysis and Jitter analysis.

Overhead and BER analysis
HP 37778A      STM-16/OC-48 test set

Mainframe has BNC connectors on the 155 Mb/s drop/insert ports.
RS-232-C printer/remote-control interface as standard.

For an overhead and analysis capability, order only one of
the following options for STM-16c and OC-48c payloads with the
preferred optical inerface.

   Opt UST     STM-16 Overhead analysis 1310 nm TX/RX
   Opt USU     STM-16 Overhead analysis 1550 nm TX/RX
   Opt USX     STM-16 Overhead analysis 1310 nm TX/RX to Class 1

and, order the following option for test PDH payloads.

   Opt A1T     STM-1e overhead and 2, 34, 140 Mb/s PDH payload testing
               (BNC)

Jitter analysis
HP 37778A      STM-16/OC-48 test set

Mainframe has BNC connectors on the 155 Mb/s drop/insert ports.
RS-232-C printer/remote-control interface as standard.

For jitter capability, order only one of the following options for
jitter analysis with electrical or electrical/optical interfaces.

   Opt USQ     Electrical only
   Opt USV     Electrical or via BER test set 1310 nm
   Opt USW     Electrical or via BER test set 1550 nm
   Opt USZ     Electrical or via BER test set 1310 nm (US FDA Class 1)

Product Overview "STM-16/OC48 testing". ( PDF)

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Related product families available online:

Digital Transmission
PDH/SDH Test Sets
SONET Test Sets

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