Installation and Operation Manual 90DIB500IM02 – 5.2
77
DIB-500 R4.1
Installation
Connecting equipment racks (as of 5 carriers)
Table 4.6 describes the connections required for connecting equipment racks.
4.4.3.1
Procedure for connecting equipment racks A and B
The procedure for connecting the two equipment racks is identical for the two variants
and is described in the following.
Connecting the equipment racks
Preparation:
✓
The two equipment racks must already be installed in the location provided for this
purpose.
✓
The LRU including the power supply must already be installed in equipment rack A
(optionally).
Carry out the following steps:
1. Connect the cables included in the scope of delivery to the corresponding port in
either of the two equipment racks. Refer to the wiring diagram in section 3.4.1.2 as
of page 45.
✓
The equipment racks have thus been connected with each other.
Table 4.6
Connecting equipment racks – required connections
Connection
Description
TIB modules (racks A
and B) – via E1
The TIB modules are chained via E1. The connection is made from the first to the second
and from the second to the third TIB module, etc.
TIB modules (racks A
and B) – via Ethernet
The TIB modules are chained via Ethernet. The connection is made from the first to the
second and from the second to the third TIB module, etc.
TIB modules (racks A
and B) – via Ethernet
(with redundancy,
optional)
The TIB modules are connected in the form of a ring via Ethernet. The connection is
made from the first to the second and from the second to the third TIB module etc. This
connection serves as a protection against a failure of the entire radio coverage when one
of the TIB modules fails (apart from the first TIB module).
If, for example, the second TIB module fails, the third and fourth module would fail as well
if it weren't for the "ring" connection from the fourth to the first module.
GPS synchronization –
via PPS
The clock synchronization between the equipment racks is implemented via the PPS con-
nection. Each TIB module is equipped with a GPS receiver for this purpose. For operating
both the equipment racks on one GPS antenna only (mounted to equipment rack A), a
PPS (Pulse per Second) connection has been provided. This connection is implemented
via an interface (PPS port) provided on the connection panel. The PPS signals from TIB
module A and B within an equipment rack are connected with each other and to the con-
nection panel. The two equipment racks are connected with each other through the PPS
ports on the respective connection panels.
Rx antennas (with
diversity)
If diversity reception is required, the corresponding connectors of the two equipment
racks must be connected with each other.
