Principles of Configuring the BSC Transmission (BM/TC Separated)

This describes the principles of configuring the BSC connection path and signaling links when the BM and TC are configured in different subracks.

The subrack communication links are configured between the GMPS and the GEPS, between GEPSs, or between GTCSs.
A maximum of three communication links can be configured between two subracks.
The communication between subracks is achieved through the GTNU in each subrack. There are six external ports, numbered TDM0-TDM5, on the panel of the GTNU. Each port can be used by only one communication link between subracks.

The semipermanent link is configured between the GMPS and the GEPS, between GEPSs, or between GTCSs.
For a semipermanent link, at least one of the following pairs of numbers must be different: the in-BSC subrack number and the out-BSC subrack number, the in-BSC slot number and the out-BSC slot number, and the in-BSC port number and the out-BSC port number.
If the data rate of a semipermanent link is 16 kbit/s, In-BSC Timeslot No. and Out-BSC Timeslot No. should be set to 0, 2, 4, or 6. If the data rate of a semipermanent link is 32 kbit/s, In-BSC Timeslot No. and Out-BSC Timeslot No. should be set to 0 or 4. If the data rate of a semipermanent link is 64 kbit/s, In-BSC Timeslot No. and Out-BSC Timeslot No. should be set to 0. If the data rate of a semipermanent link is 8 kbit/s, In-BSC Timeslot No. and Out-BSC Timeslot No. can be set to any value.
The timeslots on semipermanent links can be multiplexed onto the 64 kbit/s E1/T1 timeslot on one BSC port. The timeslots on semipermanent links and the monitoring timeslots can be multiplexed onto one 64 kbit/s E1/T1 timeslot on one BSC port.
The specified BSC port timeslot for a semipermanent link must be NULL, CIC, or FlexTS.
A maximum of 200 semipermanent links can be configured.

The Ater signaling link must be configured if the GTCS is configured on the MSC side.
Each GEIUT/GOIUT in the GMPS/GEPS can be configured with up to eight 64 kbit/s Ater signaling links.

The Ater OML must be configured when the GTCS is configured on the MSC side.
A maximum of two Ater OMLs can be configured between the GMPS and the main GTCS. The timeslot masks of the two Ater OMLs can be different.
At least four consecutive timeslots must be selected for the timeslot mask of each Ater OML.

The CICs of the A interface E1/T1 range from 0 to 65535. These CICs do not have to be consecutive. You can manually change the number of a CIC.
The CICs (except for 65535) of the A interface E1/T1 must be unique in a signaling point.
The CICs of the A interface E1/T1 between the BSC and different MSCs can be duplicate. For example, the CICs between the BSC and MSC 1, between the BSC and MSC 2, and between the BSC and MGW 1 can be duplicate.
The CICs of the A interface E1 between the BSC and multiple MGWs (DPC groups) can be duplicate. For example, the CICs between the BSC and MGW 1 and between the BSC and MGW 2 can be duplicate.
If multiple E1s/T1s of the BSC are connected to one MGW, the CICs of different A interface E1s must be unique.

There are two rate types of SS7 signaling links: 64 kbit/s and 2 Mbit/s. The 2 Mbit/s signaling link can be 2.048 Mbit/s or N x 64 kbit/s (1<N<32). One BSC can select only one rate type.
Each 2 Mbit/s signaling link can be configured with different bandwidths. The SS7 signaling links are in load sharing mode. Therefore, Huawei recommends that all the SS7 signaling links be configured with the same bandwidth. Each 2 Mbit/s signaling link can be the combination of any timeslots (except for timeslot 0) on an E1.
One pair of signaling points can be configured with up to sixteen 64 kbit/s SS7 signaling links.
One signaling point can be configured with two 2 Mbit/s signaling links on different E1/T1 cables or different STM-1 cables.
Each GMPS or GEPS can be configured with up to thirty-two 64 kbit/s SS7 signaling links.
Each GMPS or GEPS can be configured with up to eight 2 kbit/s SS7 signaling links. In E1 transmission mode, the total bandwidth of SS7 signaling links cannot exceed 4 Mbit/s. In T1 transmission mode, the total bandwidth of SS7 signaling links cannot exceed 3 Mbit/s.

You need to configure the Pb interface E1/T1 when BSC is configured with the external PCU.

You need to configure the Pb signaling link when the BSC is configured with the external PCU.

Each GMPS or GEPS can be configured with up to sixty-four 64 kbit/s Pb signaling links.

For details on the principles of configuring the Gb interface links, see Principles of Configuring the Gb Interface Links.