Michael Dorl - MACC <dorl@vms.macc.wisc.edu> (03/17/90)
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)
T1 D4, ESF, B8ZS (test equip does CSU function)
V.35
Capabilities:
Test pattern - transmit and receive
Standalone loopback testing ,with one unit
End-to-end test with two units
Able to cause the various kinds of remote loops on T1 and DDS
Signal quality measurements such as jitter and spectrum
Detect T1 events such as checksum errors, bipolar volations,
framing errors, etc.
Any other things I should be interested in?
Any suggestions on vendors other than FIREBERD?
Michael Dorl (608) 262-0466 fax (608) 262-4679
dorl@vms.macc.wisc.edu
dorl@wiscmacc.bitnetbww@hpqtdla.sqf.hp.com (Brian Woodroffe) (03/20/90)
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.