4
Datacom specifications
Datacom interfaces:
V.24,
V.11/X.21-leased, V.35.
Terminal emulation:
DTE, DCE.
Timing modes:
Synchronous
from 50 b/s to 2.048 Mb/s;
asynchronous from 50 b/s to
19.2 kb/s (except X.21-leased).
V.24 breakout
Isolation switches:
TD, RD,
XTC, TC, RC, RTS, CTS, DTR,
DSR, DCD, situated between
drivers/receivers and interface
connector.
Four-state indicators:
TD, RD,
XTC, TC, RC, RTS, CTS, DTR,
DSR, DCD and monitor.
Patch points and voltage
sources.
V.11/V.35 activity indicators
Data and clock:
SD, RD, TT/
SCTE, ST/SCT, RT/SCR.
Control circuits:
RS, CS,
TR/DTR, DM/DSR, RR/RLSD.
Synchronous mode
Clock sources:
Internal
synthesizer, datacom interface.
(Selectable clock inversion.)
Interface clock rates:
50 b/s to
2.048 Mb/s,
±
10 ppm.
Synthesizer rates:
1.2, 2.4, 4.8,
9.6, 14.4, 19.2, 48, 56, 64, 384, 256,
512 kb/s, 1.024, 1.984 Mb/s,
variable (600 b/s to 2.048 Mb/s).
V.24 rate limited to 128 kb/s.
Datacom testing using the
HP 37732A telecom/datacom analyzer
Asynchronous mode
Rates:
50, 75, 110, 134.5, 150, 200,
300, 600 b/s; 1.2, 1.8, 2.4, 4.8, 7.2,
9.6, 19.2 kb/s.
Character length:
5, 6, 7 or
8 bits.
Parity:
Odd, even, 0, 1 or none.
Stop bits:
1, 1.5 or 2.
Data polarity:
Normal or inverse.
Error add:
Single, variable
10
−
2
to 10
−
5
.
Test patterns
PRBS:
63, 511, or 2047 bit, 2
15
−
1,
2
20
−
1.
Fixed:
Permanent mark,
alternating mark/space inversion,
FOX message (asynchronous
mode only).
Word:
User-defined word, 8 to
1024 bits in 8 bit intervals.
Test period:
Manual, timed
interval (1 s to 100 days), bit
interval (10
n
bits, n = 4 to 10).
HP 37732A telecom/datacom analyzer
