Multiplexing Mode

Multiplexing Mode

This parameter specifies the timeslot multiplexing mode of the Abis interface of the BTS. There are two multiplexing modes: 64 kbit/s statistical multiplexing mode 16 kbit/s physical multiplexing mode.

The 64 kbit/s statistic multiplexing mode can be classified into the following modes:

1:1 64 kbit/s statistic multiplexing mode;

2:1 64 kbit/s statistic multiplexing mode;

3:1 64 kbit/s statistic multiplexing mode;

4:1 64 kbit/s statistic multiplexing mode;

5:1 64 kbit/s statistic multiplexing mode;

6:1 64 kbit/s statistic multiplexing mode.

The eight timeslot objects of the BTS are as follows:

OML: Operation and maintenance links of a BTS. One BTS has only one OML and the rate is 64 kbit/s. In 64 kbit/s statistical multiplexing mode, the OML can only be multiplexed with the RSL in the BTS at the same level; in 16 kbit/s physical multiplexing mode, a 16 kbit/s timeslot unit is occupied.

ESL: Extended signaling links of a BTS. When the Flex Abis is supported by the BTS and the 64 kbit/s statistic multiplexing mode is applied, the 64 kbit/s timeslots should be allocated. The 64 kbit/s timeslot of the BTS should be multiplexed with those of the OML onto the 64 kbit/s timeslot; in 16 kbit/s physical multiplexing mode, the timeslots are not allocated. That is, the ESL shares the same timeslots as the OML.

RSL: Signaling links of a BTS. One TRX has one RSL. In 64 kbit/s statistic multiplexing mode, the rate is 64 kbit/s and the RSL can only be multiplexed with the OML in the BTS at the same level, or be multiplexed with the RSL in the same cabinet group; in 16 kbit/s physical multiplexing mode, a 16 kbit/s timeslot unit is exclusively occupied.

TCH: Traffic channel of the TRX with a data rate of 16 kbit/s.

Idle: Idle timeslot of a BTS with a data rate of 16 kbit/s. The idle timeslot can be multiplexed only with the TCH of the same cabinet group onto a 64 kbit/s timeslot.

Semi: Monitoring timeslot of a BTS with the data rate of 8 kbit/s, 16 kbit/s, 32 kbit/s, and 64 kbit/s. The monitoring timeslot can only be multiplexed with that on the semipermanent link.

Forbid: Forbidden timeslots of a BTS. These timeslots are used in some special scenarios such as the satellite transmission or when only some timeslots on an E1 port are available.

HDLC: HDLC 64kbit/s timeslots of a BTS. These timeslots are bound to the HDLC channels for signaling and service transmission.

An E1 frame (2.048 Mbit/s) can be divided into thirty-two 64 kbit/s timeslots. In which, timeslot 0 is used for synchronization and thus cannot be allocated again.

In statistic multiplexing, OML and RSL are multiplexed in one E1 timeslot. For example, the OML and the RSL, or two RSLs are multiplexed onto one E1 timeslot.

In the 4:1 multiplexing application, three RSLs and one OML of one BTS, or three RSLs and four RSLs of one BTS can be multiplexed in one 64 kbit/s timeslot.

If the multiplexing ratio exceeds 4:1, the 4:1 application is still used in the links to be multiplexed with the OML. For links to be multiplexed with the RSL, the multiplexing is performed according to actual scenarios.

[1:1,2:1,3:1,4:1,5:1,6:1,16K]

4:1

None

-

When the transmission resources are insufficient and the traffic volume is light, you can set this parameter to 5:1 or 6:1 if the Flex Abis is enabled. This may lead to link congestion.

In Flex Abis mode, a maximum of one OML, two RSLs, and one ESL can be statistically multiplexed in one 64 kbit/s timeslot.

When this parameter is set to 5:1, it indicates that five RSLs are statistically multiplexed in one 64 kbit/s timeslot.

When this parameter is set to 6:1, it indicates that six RSLs are statistically multiplexed in one 64 kbit/s timeslot.

When the Flex Abis function is enabled, one ESL, dedicated to transmitting signaling for Abis timeslot dynamic setup over the Abis interface, is required.

In 64 kbit/s statistic multiplexing mode, the ESL and OML must use the same 64 kbit/s timeslot on an E1. The maximum number of RSL links reused by the OML must be adjusted. A maximum of two RSL links can be reused (previously three RSL links is the maximum).

Configure another one or two 64 kbit/s timeslots for the 5:1 or 6:1 multiplexing if one or two RSLs are redundant according to the 4:1 multiplexing. Thus, five RSLs or six RSLs are statistically multiplexed in one 64 kbit/s. Thus, the 64 kbit/s Abis interface is not exclusively occupied.

4:1

None

None

Parameters About Equipment

Modifying this parameter leads to BTS reset.