User Manual

LMF Connection to the BTS – continued

July 1999

3-7

SC 4812ET BTS Optimization/ATP – CDMA LMF

PRELIMINARY 2

Table 3-2: T1/E1 Span Isolation

Step Action

1 From the OMC/CBSC, disable the BTS and place it OOS.

– 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.

* IMPORTANT

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

LMF to BTS Connection

The LMF is connected to the LAN A or B connector located on the left

side of the frame’s lower air intake grill, behind the LAN Cable Access

door (see Figure 3-2).

Table 3-3: LMF to BTS Connection

Step Action

1 To gain access to the connectors, open the LAN Cable Access door, then pull apart the Velcro tape

covering the BNC ”T” connector and slide out the computer service tray, if desired. See Figure 3-2.

2 Connect the LMF to the LAN A BNC connector via PCMCIA Ethernet Adapter with an unshielded

twisted–pair (UTP) Adapter and 10BaseT/10Base2 converter (powered by an external AC/DC

transformer).

NOTE

– Xircom Model PE3–10B2 or equivalent can also be used to interface the LMF Ethernet

connection to the frame connected to the PC parallel port, powered by an external AC/DC

transformer. In this case, the BNC cable must not exceed 91 cm (3 ft) in length.

* IMPORTANT

The LAN shield is isolated from chassis ground. The LAN shield (exposed portion of BNC

connector) must not touch the chassis during optimization.