1-26
General Information
Specifications
single TU to be overwritten, as opposed
to the complete payload. All of the test
features which affect the TU and/or the
POH are enabled (i.e. errors and
alarms, adjust pointer. Full Rx
functionality also available).
STM-1e and STM-0/STM-1e
receiver functions
STM-1 receive input
Equalization: Automatic for cable loss
up to 12 dB at half the bit rate.
Monitor point compensation:
Monitor mode conforms to ITU-T
G.772. Monitor gain 20 to 26 dB.
STM-0 receive input
Operating level: Receiver mode is user
selectable.
STM-0 XCON: 530 mV peak nominal
STM-0 HI: 1.1 V peak nominal,
equalization up to 450 ft.
STM-0 LOW: 1.1 V peak nominal,
equalization from 450 to 900 ft.
Monitor point compensation:
Monitor mode conforms to ITU-T
G.772. Monitor gain 20 to 26 dB.
STS-3/STM-1e and STM-0/
STM-1e test and interfacing
(Option 120)
(for SDH specification see A3R)
OUT and IN ports (used for transmit)
Type: Electrical: To ITU-T G.703.
Connectors: BNC, 75 Ω, unbalanced.
Rate: 155.52 Mb/s. 51.84 Mb/s.
Line code: 155.52 Mb/s: CMI.
51.84 Mb/s: B3ZS.
Output level: 155.52 Mb/s: ±0.5 V
±10%. 51.84 Mb/s: Output level is user
configurable.
STS-1 X CON: 530 mV peak nominal.
STS-1 HI: 1.1 V peak nominal.
STS-1 LOW: 350m V peak nominal.
Error output: B3 error output pulse on
receipt of STS-1 and STS-3 signals.
TTL pulse termination 75 Ω or 10 k Ω.
Simultaneous STS-3 and OC-3:
When used in conjunction with the
appropriate optical interfaces, transmit
STS-3 electrical output signal
simultaneously with OC-3 optical
output signal.
Transmitter
Clock timing: Internal: All rates.
Recovered: From SONET input (CMI
or NRZ electrical or optical)
Bits: 1.544Mb/s DS1 timing reference
as per TA-TSY-000378 Bantam, 100 Ω
nominal, unbalanced
Ext MTS: 64kb/s conforming to ITU-T
G.703, Bantam, 120 Ω balanced*
2 Mb/s conforming to ITU-T G.811,
BNC 75 Ω unbalanced,*
Bantam 120 Ω balanced.*
* Available when instrument in SDH
mode.
Frequency offset generation:
Up to ±999 ppm in 0.1 ppm steps.
Error addition:
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