Services Units and Gateways
Protected ONS Ports
Protected ONS ports (ONSP) are available on:
• the ONS/LS combo card (can be used on the ASU II and the AX)
• the 16 and 24 port ONS cards (can be used on the ASU II and the AX)
• ports 1 and 2 on the CX/CXi and CX/CXi II Controller with AMB Version III
Loop status LED per card per circuit
Low level diagnostics Yes Yes
Message Waiting Cadence See Table 62, “Message Waiting Parameters,” on page 87
Message Waiting indication
4
Yes Yes
DC Message Waiting Load capability
3
2 sets
9
supported 2 sets
9
supported
DC Message Waiting voltage compat. with 90 V neon lamps
8
compat. with 90 V neon lamps
8
Metering generation No No
On-hook Transmission capability
3
500 ms, current feed < 1 mA Yes
Positive Disconnect Yes Yes
Ringing Frequency Country-specific, see Table 18, “ONS Circuit Impedance Values,” on
page 49
Ringing Load capability 2 REN
7
3 REN
7
Ringing type balanced sinusoidal unbalanced sinusoidal
Ringing voltage (open cct) 55 Vrms 65 Vrms
Timed Flash detection min. 100 ms min. 100 ms
Notes:
1. Approximately one mile (1.5 km) of loop range over 26-gauge cable with 150 ohm set.
2. Approximately 5.17 miles (8.13 km) over 22-gauge cable with 300 ohm set or
3.25 miles (5.19 km) over 24 gauge cable with 300 ohm set, or
2 miles (3.2 km) over 26 gauge cable with 300 ohm set - Minimum 20 Vrms
3. Used for sending CLID
4. CLASS message only.
5. The MWI signal provided by the ASU II and the AX is intended to be used with phones that support 90 V
signaling.
6. Up to 1600 ohms (including 400 ohm set)
7. REN = Ringing Equivalent Number
8. Strike voltage < 100 V
9. 10 Kohm per set
Table 53: ONS Station Line Circuits by ASU type (continued)
Attribute ASU II
5
ASU
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