HP 37717C, Calibration Manual, Page: 96 / 399

2-7
Installation
Connecting to the Network
DS1 100
Ω,
2Mb/s 120
Ω
IN
PDH / DS1 receiver input interface. Allows the connection of 100
Ω
balanced DS1 and 120
Ω
balanced 2 Mb/s data signals.
DS1 100
Ω,
2Mb/s 120
Ω
OUT
PDH / DS1 transmitter output interface. Provides 100
Ω
balanced DS1
and 120
Ω
balanced 2 Mb/s data signals. A “keep alive” signal is output
when the transmit signal is SDH/SONET.
75
Ω
OUT 1 Replica of PDH / DSn OUT delayed by 4 bits at all rates except 140 Mb/s.
75
Ω
OUT 2 Replica of PDH / DSn OUT delayed by 8 bits at all rates except 140 Mb/s.
75
Ω
OUT 3 Replica of PDH / DSn OUT delayed by 12 bits at all rates except
140 Mb/s.
ERROR OUT
Provides an ECL pulse each time an error occurs. If 2 or more errors
occur within 16 clock periods only 1 pulse is output.
STM-1 IN SDH receiver input interface. Allows the connection of 75
Ω
unbalanced
STM-1 electrical signals.
STM-1 OUT SDH transmitter output interface. Provides a 75
Ω
unbalanced STM-1
electrical output.
EXT MTS CLOCK Allows connection of a, 75
Ω
or 120
Ω
, timing reference as per CCITT
G.811. The reference format may be either clock or data. Options
US1[US5] and A1T[A1U] only.
CLOCK IN Allows connection of SDH/SONET binary clock to Options 130 or 131.
CLOCK OUT
(Opt OYH) Provides a STM-1/STM-4 binary clock from Options USN or UKT.