Carrier Access SNMP manual 11.4 E&M Signaling Conventions

E&M Signaling Conventions

Dedicated Transmission	4-Wire E&M
	TO Mode
Only		T1 Network
	Modem for Data	Connection
Up to 24 E&M or TO
Interfaces in 12 Channel		Public or Private
Increments		Network
Access Bank I
Stations
Analog PBX	4-Wire E&M
	Normal Mode

Figure 11-1: Normal Mode E&M Termination

Carrier Network

PBXT1

T1

Access Bank I Access Bank I

4-Wire E&M

Tandem

Mode

4-Wire E&M

Tandem

Mode

Radio or Microwave	Radio or Micro-	Radio or Micro-	Radio or Microwave
Transceiver	Wave tower	Wave tower	Transceiver

Figure 11-2: Tandem Mode E&M Access to Leased Lines or Carriers

11.4 E&M Signaling Conventions

According to E&M signaling conventions, switching equipment always originates signaling on the M-lead (the “mouth” sending toward the transmission line). The E-lead of the switching equipment

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