User's Manual Part 2

Isolate Span Lines/Connect LMF

DRAFT

SCt4812T CDMA BTS Optimization/ATP

Mar 2001

3-4

Isolate BTS from T1/E1 Spans

At active sites, the OMC/CBSC must disable the BTS and

place it out of service (OOS). DO NOT remove the 50–pin

TELCO cable connected to the BTS frame site I/O board

J1 connector until the OMC/CBSC has disabled the BTS!

IMPORTANT

Each frame is equipped with one Site I/O and two Span I/O boards. The

Span I/O J1 connector provides connection of 25 pairs of wire. A GLI2

card can support up to six spans. In the SC 4812T configuration, the odd

spans (1, 3, and 5) terminate on the Span ”A” I/O; and the even spans (2,

4, and 6) terminate on the Span ”B” I/O.

Before connecting the LMF to the frame LAN, the OMC/CBSC must

disable the BTS and place it OOS to allow the LMF to control the

CDMA BTS. This prevents the CBSC from inadvertently sending

control information to the CDMA BTS during LMF based tests. Refer to

Figure 3-1 and Figure 3-2 as required.

Table 3-1: T1/E1 Span Isolation

Step Action

1 From the OMC/CBSC, disable the BTS and place it OOS. Refer to SC OMC–R/CBSC System

Operator Procedures.

– The T1/E1 span 50–pin TELCO cable connected to the BTS frame SPAN I/O board J1 connector

can be removed from both Span I/O boards, if equipped, to isolate the spans.

NOTE

If a third party is used for span connectivity, the third party must be informed before disconnecting the

span line.

* IMPORTANT

Verify that you remove the SPAN cable, not the “MODEM/TELCO” connector.