Specifications

Chapter 1 Installation
1-5
Grounding
The separate Ground connection on the Access Bank power input may be connected to one of three
locations on the customer premises. Proper grounding of the Access Bank is very important for safety,
proper signaling with an attached PBX, and protection of Access Bank electronics against lightning and
a.c. power transients. A ground wire size of at least 18 AWG must be used.
The Telco or Safety Ground Connection Options are:
1) The "Telco Ground" buss that is separately connected to a ground rod or heavy ground
wire in a customer equipment room. This ground may also be a clamp on a cold water
pipe or grounded electrical conduit. The telephone system to which the Access Bank is
connected should also be grounded to the same buss bar or clamping point.
2) The PBX or telephone system ground point. If the Access Bank is not grounded to the
telephone system, FXS signalling may not work properly.
3) The A.C. safety ground available on the third prong of modern grounded a.c. building
wiring. This is also called "Green Wire" ground. This is the safety grounding point
used by the Access Bank 115Vac Power Supply. The Access Bank Ground will be
connected to the Green Wire a.c. ground if it is left on the third position of the Power
Supply removable plug connector (as shipped). Note that the AB-115POWER Supply
will always be safety grounded when plugged into a modern outlet. The Ground
Connection at the Access Bank removable power plug connector can be independently
attached to one of the first two grounding options listed above.
T1 Cabling
The Access Bank
TM
T1 LINE (DS1 or NETWORK) interface is provided on an industry-standard RJ48C
8 pin connector, as shown in figure 2.1. The LINE connection is typically cabled to the
telecommunications carrier T1 demarcation point at the customer premise using the included T1 cable
(#P01575). For integrated voice and data applications, the Access Bank may be connected to the Carrier
Access DataSplit D&I port using cable #P01519. Carrier Access Corporation manufactures cables for this
application that are sold as accessories (see following).
When installing this cable, the end with the RFI Choke (white plastic covered ferrite core) is to be plugged
into the Access Bank. If another length of T1 cable is substituted for the supplied cable, please transfer
the RFI choke to the new cable. Install with two wraps around the RFI Choke, as it was installed on the
factory supplied cable.
Table 2.3 T1 Line Interface on RJ48C - 8 pin Modular T1 jack
Pin Number Signal Signal Direction
1 Receive Ring From DS1 Network
2 Receive Tip From DS1 Network
3 No connection
4 Transmit Ring To DS1 Network
5 Transmit Tip To DS1 Network
6 No connection