TM 11-7025-221-10
1 - 9 . Location and Description of Major Components - Continued.
Display. 96-character display (3 lines with 32 characters/line). Displays alphanunerical messages
for operator use. Also contains five alarm indicators to inform operator of malfunctions.
ALARM Horn and RESET Switch. Used by operator for following functions.
. ALARM horn sounds when orderwire call is received or when certain alarm conditions exist.
. ALARM RESET switch used to silence ALARM horn.
H-250 HANDSET Connector. Connector for attaching a H-250 handset.
1-10. Differences Between Models.
External physical appearance of front panels on all models is identical. Internal hardware differences between
models (not visible to operator) result in the following functional differences between models.
Functional Differences Between Models
V4
V1
V2
V3
Capability
GROUP INTERFACES
4
2
8
8
Max No. of active ports (group inputs/outputs) . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
0
2
0
No. of unbalanced NRZ interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
4
2
8
8
No. of balanced NRZ interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1
1
1
No. of conditioned diphase (group modem) interfaces . . . . . . . . . . . . .
SG INTERFACES
1
1
1
1
No. SG's transmitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
4
4
1
No. SG's received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ORDERWIRES
yes
yes
yes
16 kb/s non-secure digital voice (H-250 handset) . . . . . . . . . . . .
yes
yes
yes
yes
yes
16 kb/s secure digital voice (Vinson) . . . . . . . . . . . . . . . . . . . . . ..
no
no
yes
2.4 kb/s digital voice (ANDVT) . . . . . . . . . . . . . . . . . . . . . . . . . . .
yes
MISCELLANEOUS
yes
yes
yes
16/32 kb/s dedicated user conditioned diphase . . . . . . . . . . . . . . . . .
yes
interface (loop modem)
no
yes
no
yes
CESE telemetry reporting function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
no
TD-754 demux function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
yes
no
yes
no
TD-754 mux function . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
no
no
yes
no
no
no
TD-976 mode capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
yes
1-7
