User Manual

Span Lines – Interface & Isolation

5/21/04 1X SC4812T–MC BTS Optimization/ATP 3-13

DRAFT

T1/E1 Span Interface

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!

NOTE

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

Span I/O J1 connector provides connection for 25 wire pairs. A GLI card

can support up to six spans. In SC4812T BTS frames, spans A, C, and E

terminate on the Span “A” I/O; and spans B, D, and F terminate on the

Span “B” I/O.

Span Lines will interface to the BTS through the Span I/O

cards only in circuit mode with either circuit or split

backhaul.

NOTE

Before connecting the LMF to the frame LAN, the OMC–R must disable

the BTS and place it OOS to allow the LMF to control the CDMA BTS.

This prevents the OMC–R from inadvertently sending control

information to the BTS during LMF–controlled tests. Refer toFigure 3-2

and Figure 3-3 as required.