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Telecom specifications
Bit rates: 2.048 Mb/s, 64 kb/s;
optional 8.448 Mb/s, 704 kb/s, sub-
64 kb/s.
Frame structure: 2 Mb/s
unframed, to ITU-T G.704, G.706,
G.732, G.704: with no multiframe;
with CAS multi-frame with/
without CRC4 multiframe;
64 kb/s codirectional; independent
setting for transmitter and
receiver.
Interfaces: To ITU-T G.703 and
G.823.
Connectors
BNC: 75 ohm, unbalanced.
3-pin Siemens: 120 ohm,
balanced.
Modes of operation
Transmit, receive, through mode.
Auto setup
Bit rate, line code, framing and
pattern.
Test patterns
PRBS: 2
11
− 1 (ITU-T O.153),
2
15
− 1, 2
23
− 1 (ITU-T O.151)
(inverted or non-inverted).
Word: Fully programmable n-bit
word (n=8 to 1024); all ones, 1 in 2
(1010).
Timeslot selection: All
timeslots, single timeslot, n
timeslots for n = 1 to 31
(contiguous or non-contiguous).
Receive timeslot as for
transmitter, or independently set.
Deselected timeslots: 2
6
− 1
PRBS or all ones (transmit only).
Test period: Manual, single:
15 min, 30 min, 1 hour, 24 hour,
user defined:
1 to 100 seconds, minutes, hours,
days.
Transmitter
Timing: Recovered (loop timed),
internal, external.
Internal clock: 2.048 MHz,
64 kHz, (± 10 ppm).
2 Mb/s transmitter
Output
Ternary: HDB3 or AMI.
Binary: TTL, data NRZ, clock
normal or inverted, .
Error insertion
Bit, code: Single, variable 10
−2
to
10
−8
.
Frame error add
FAS word, NFAS bit, CAS MFAS
word (CAS multiframe mode);
CRC MFAS word and CRC bits
(CRC4 multiframe mode).
Mode: Burst, continuous.
Alarm generation: AIS 2 or 3
zeros in 512; AIS all ones, remote
alarm, remote mutiframe alarm,
no signal.
Signaling bits: Set ABCD
signaling bits in CAS multiframe
to any 4-bit pattern (all channels
contain the same pattern).
Overhead bits: Individual setting
of Si, spare MFAS, NFAS bits 4 to
8 (Sa) for all odd-numbered
frames.
64 kb/s transmitter
Codirectional data output
Octet timing (to ITU-T G.703):
On, off.
Bit error add: Single, variable
10
−2
to 10
−8
.
Specifications for telecom testing using the
HP 37722A telecom analyzer or the
HP 37732A telecom/datacom analyzer
Receiver
2 Mb/s receiver
Timeslot monitor: Displays
contents of single data timeslot,
FAS timeslot, NFAS timeslot (bits
1 to 8 for all odd-numbered
frames), MFAS, single signaling
channel or all signaling channels.
Input
Binary/ternary: 2.048 Mb/s
± 100 ppm (nominal).
Terminate: 0 to 30 dB.
Binary: TTL, data NRZ, clock
normal or inverted.
64 kb/s receiver
Codirectional data input:
64 kb/s ± 150 ppm (nominal).
Terminate: 0 to 30 dB.
HP 37722A telecom analyzer