Nortel Networks Passport 4400 - Manual (Page 89)

Analog Voice Modules Passport 4400 Hardware Installation Manual
8-11
E&M Interface Module
The E&M interface module telephone interface signals are terminated in an 8-
pin tie trunk terminal block on the back panel (see Figure 8-12, “E&M Interface
Module, Back Panel Connector”). This connector is fitted with a female plug.
Individual cable leads are connected to this plug to form a telephone interface
cable.
Figure 8-12. E&M Interface Module, Back Panel Connector
E&M Strapping
There are a total of 22 straps on the E&M interface module (see Figure 8-13,
“Location of Straps, E&M Interface Module”). Their functions are as follows:
• E1 through E5. These straps are reserved for factory use only. They must
not be altered by the user.
• E6, E7, and E9 through E13. These straps are used to select signaling
types I, II, and V.
• Straps E8 and E17 are normally installed to shunt out DC blocking
capacitors C36 and C38. They must be removed in case there are DC
voltages present in the R and R1 leads.
• Strap E14 is used to shunt out the series resistor in the E lead in case the
loop resistance is too high to trip the detector inside the PBX. If cabling is
short, try removing the strap.
• Strap E15 is used for dial pulse correction; it connects a 1-
µ
f filter
capacitor between the SG lead and ground.
• Strap E16 is used to shunt out the series resistor in the SB lead in case the
loop resistance is too high to trip the detector inside the interface module.
If cabling is short, try with the strap removed.
• Straps E18 and E19 are reserved for factory use only. They must not be
altered by the user.
• Straps E20, E21, and E22 are spares.
E&M
Interface Module
1
Terminal
Block
RJ1CX Pin Assignments and
Wire Colors (4-wire)
1
2
3
4
5
6
7
8 Tip 1 (T1)
Ring 1 (R1)
Tip (T)
Ring (R)
Signal Ground (SG)
Ear (E)
Mouth (M)
Signal Battery (SB)