ZyXEL Communications IP PBX X6004 - Manual (Page 528)

Chapter 39 Product Specifications
X6004 User’s Guide
528
ISDN PRI Cable (E1/T1) Pin Assignments
Use RJ-48 cables to connect the ISDN PRI ports to the PBX (Private Branch
Exchange). The following diagram and chart show the pin assignments of the
ISDN PRI cable.
Figure 301 ISDN PRI Cable Pin Assignments
Table 208 ISDN PRI Cable Pin Assignments
RJ-48
PIN
RJ-48 PIN SIGNAL
1 4 RX/Ring/- <-->TX/Ring/-
2 5 RX/Tip/+ <-->TX/Tip/+
4 1 TX/Ring/- <-->RX/Ring/-
5 2 TX/Tip/+ <-->RX/Tip/+
3 3 Shield/Return/Ground
6 6 Shield/Return/Ground
7 7 No connect
8 8 No connect