Black Box ME375A-R2, User Manual

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APPENDIX: Pinouts
ITU-TSS EIA Signal Name/ ITU-TSS Signal Name/ Description
(CCITT) RS-232 Abbreviation for V.35 Abbreviation for
V.24 Pin EIA RS-232 Pin(s) ITU-TSS V.35
Circuit (ME375) (ME375) (ME376) (ME376)
114 15 Transmitter Signal Y Serial Clock Transmit A More commonly known as
Element Timing [DCE] (SCT A) Transmit Clock (TXC). The
(TSETC) AA Serial Clock Transmit B A/S2W SHM sends this
(SCT B) data-rate clock signal to
the DTE and the remote
unit. The A/S2W SHM
derives its sync clock from
this signal only if its
CLOCK jumper is set to
INT. Positive clock
transitions correspond to
positive data transitions.
115 17 Receiver Signal V Serial Clock Receive A More commonly known as
Element Timing [DCE] (SCR A) Receive Clock (RXC). The
(RSETC) X Serial Clock Receive B remote A/S2W SHM sends
(SCR B) this data-rate clock signal
to the lccal unit, which in
turn passes it to the DTE.
The A/S2W SHM derives
its sync clock from this
signal only if its CLOCK
jumper is set to LBT.
Positive clock transitions
correspond to positive
data transitions.
140 21 Remote Loopback (RL) HH Remote Loopback (RL) The DTE raises this signal
to the A/S2W SHM to
cause it to begin and
maintain remote digital
loopback (V.54 Loop 2).
The A/S2W SHM ignores
this signal unless its RLB
jumper is set to EN.
141 18 Local Loopback (LL) JJ Local Loopback (LL) The DTE raises this signal
to the A/S2W SHM to
cause it to begin and
maintain local analog
loopback (V.54 Loop 3).
The A/S2W SHM ignores
this signal unless its LLB
jumper is set to EN.