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From: bww@hpqtdla.sqf.hp.com (Brian Woodroffe)
Newsgroups: comp.dcom.telecom
Subject: Re: T1 and DDS Test Equipment
Message-ID: <5366@accuvax.nwu.edu>
Date: 19 Mar 90 16:26:34 GMT
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X-Telecom-Digest: Volume 10, Issue 185, Message 4 of 9


With regard to the following RFI, I think you should check out the
HP3787B The following (brief) description of the capabilities of the
Hewlett-Packard 3787B Digital Data Test Set has been culled from the
1989 HP catalogue:

ISDN D & D channel Protocol Analysis interface
Comprehensive bit error measurements and analysis at DS1C, DS1, DS0 and DDS
interfaces.
Sub-rate drop and insert.
Built in data logging.
DS1 Jitter analysis.

Drop & Insert:
If the Transmitter/receiver is suitably frames, test patterns or control
codes can be inserted to/extracted from the following:-
Individual timeslot (64k and 56kbit/s)
DDS: 2.4k, 4.8k, 9.6k, 19.2k, 56kbit/s primary or secondary channels (DS0A
and DS0B.)
4kbit/s Datalink (ESF)
4kbit/s Fs channel (DS1 Ft)
8kbit/s R-channel (T1DM)

Measurements:
Frequency: DS0 (64kbit/s), DS1 (1.544Mbit/s), DS1C (3.152Mbit/s)
Framing: DS1 (SF, ESF, T1DM and Ft only), DS1C and DS0B
Line Code: B8ZS, AMI.
Error Types: Logic (binary), Bipolar Violations, Frame Word, CRC-6 Word.
Error Results: Error count, Error Ratio, Error Seconds, Error Free Seconds,
	% Error Free Seconds.
Error Analysis: %Availability, %Unavailability, %Severely Errored Seconds,
	%Error Seconds, %Degraded Minutes, Count Consequective SES, Count
	SES, Count ES, Count Degraded Minutes.
Alarm Seconds: Instrument Power Loss Seconds, Signal Loss Seconds, AIS
	Seconds , Frame Loss Seconds, Test Pattern Loss Seconds.
Frame Slips (Controlled): separate and concurrent indication of positive and
	negative slips.
Protocol Analyser Interface: RS232C 4-wire synchronous interface, for the
	following: DDS primary & secondary channels ISDN B/D (64/56kbits/s)
	ESF datalink, D4 Fs channel, T1DM R-channel.
DS0 Bit monitor:Selected received csutomer bytes displayed.
Signalling bits: A,B(SF) or A,B,C,D(ESF) can be ste/didsplayed for 56kbit/s.

DS1 Jitter Measurement(option)
Peak-to-Peak: Range 0.00 to 10.00UI, in 0.01 UI steps
Jitter Filters: LP=2Hz to 40Khz, HP1+LP=10Hz to 40Khz, HP2+LP=8Khz to 40Khz.
Jitter Threshold:0.05 to 10.00UI pk/pk in 0.01UI pk/pk increments.
Jitter Hit Measurements: Jitter Hit Count, Jitter Hit Bit Count, Jitter Hit
	Bit Ratio, Jitter Hit Seconds, Jitter Hit Free Seconds.

Now with regard to your specific points:

|I'm interested in test equipment for 56k DDS and T1 lines.  I'm just
|starting to investigate but I think I want gear with following
|capabilities:

|  Interfaces supported:

|    56k DDS plain (don't care about secondary channel)

Yes, secondary channel is included.

|    T1 D4, ESF, B8ZS (test equip does CSU function)

Yes, yes, yes (not sure what you mean).

|    V.35

DSX type connections or RS232C as appropriate.

| Capabilities:
|
|    Test pattern - transmit and receive

Yes, standard PRBSs etc.

|    Standalone loopback testing ,with one unit

Yes, (In DDS the returned MAP-codes are checked for.)

|    End-to-end test with two units

Yes.

|    Able to cause the various kinds of remote loops on T1 and DDS

Yes, T1: inband or data link, DDS alternating or latching and MJU
routining. 

|    Signal quality measurements such as jitter and spectrum

Yes, jitter

|    Detect T1 events such as checksum errors, bipolar volations,
|    framing errors, etc.

Yes, yes, yes.

|Any other things I should be interested in?

Yes, the '87 has probably the fullest coverage of T1 & DDS
functionality.  T1 pipe testing; DDS: Primary channel, Secondary
channel, full sub-rate E/C (even 19.2kbit/s), Loopbacks, MJU routing
etc. The '87 is combined transmitter receiver, which operate
independantly to allow testing across levels in the hierarchy.
Obviously it is remote controllable (both HPIB & RS232).

Your nearest HP dealer will have fuller details:
(for Wisconsin:-)

Hewlett-Packard
275N Corporate Drive
Brookfield, WI 53005
Tel (414) 792-8800  fax (414)792-0218

+--------------------------------+-----------------------------------+
| Brian Woodroffe                | HPDESK: Brian Woodroffe/HP1400/B1 |
| Hewlett Packard Ltd            | ARPA:   bww@hpsqf                 |
| Queensferry Telecomms Division |         bww%hpsqf@hplabs.hp.com   |
| South Queensferry              | UUCP:   ..!hplabs!hpqtdla!bww     |
| West Lothian                   | JANET:  bww%hpqtdla@hpl.hp.co.uk  |
| Scotland EH30 9TG.             | PHONE:  +44-31-331-7234           |
+--------------------------------+-----------------------------------+

NB: You are advised to check the suitability yourself.