Trunk Types Description; 2-Wire And 4-Wire E&M Type 1 Trunk Operation (Dc-5) - Northern Telecom NT5K17 Description

Trunk types description

2-wire and 4-wire E&M Type 1 trunk operation (DC-5)
United Kingdom United Kingdom United Kingdom
United Kingdom United Kingdom United Kingdom
The loss PADs for AC15 and 4-wire E&M trunks are selected by the class
of service (COS) assigned to the trunk data block (LD 14).
• PADs should be switched OUT when trunks are connected using on-
premise wiring.
(COS = NTC)
• PADs should be switched IN when trunks are connected using a leased
circuit.
(COS = TRC)
Each unit on the NT5K19 Analog Tie trunk card can operate as one of the
following:
• 2-wire and 4-wire E&M trunk (DC-5)
• 2280 Hz Tie trunk (AC15)
• Recorded Announcement (RAN) trunk
• Paging (PAG) trunk
• Music (MUS) trunk
• Emergency Recorder (RCD) trunk.
For information on features and signalling arrangements, see Generic X11
Including Supplementary Features (PO730484, or NTCK09 in the U.K).
The NT5K19 Analog Tie trunk card supports the United Kingdom DC5-A
method of signalling, which is used between a PBX and co-sited
equipment. The two signalling wires used, E and M, are electrically
separated from the associated speech circuit. Signals are sent on the M
wire and received on the E wire.
Send signals
All signals are sent in the form of either Earth-On or Earth-Off applied to
the M wire. Earth-On is the application of ground to the M wire through a
resistance of 1250 ohms, while Earth-Off is the removal of the Earth-On
condition. In both Earth-On and Earth-Off conditions, a grounded 1µF
capacitor is applied to the M wire.
NT5K19 Analog Tie Trunk Card 3-7
UK Trunk cards description 553-3001-173