Ericsson LBI-39224 manual T1/E1 Channel Assignment, Subrate Port Assignments for Analog/Modem Mode

LBI-39224

T1/E1 Channel Assignment

T1/E1 logical channels are assigned starting with channel 1, these are the channels used to transmit voice, data, and image signals from one system node to another. E1 channel 16 is used for signaling if signaling is enabled. (See "Signaling Type" under T1/E1 Digital Site Configuration above.) Subrate ports for user data are assigned channels adjacent/after logical channels according to the table below. Asynchronous (async) ports, up to 5, are assigned first and then synchronous (sync) ports are assigned.

Table 2 Subrate Port Assignments for Analog/Modem Mode

Free Channels (Per Card)	Subrate Port Auto-configuration*
0	no subrate ports available
1	port 1 = async
	ports 2 - 8 = not available
2	port 1 = async
	ports 2 - 5	= sync
	ports 6 - 8 = not available
3	ports 1 & 2	= async
	ports 3 - 5	= sync
	ports 6 - 8 = not available
4	ports 1 - 3 = async
	ports 4 & 5 = not available
	ports 6 - 8	= sync
5	ports 1 - 4 = async
	port 5 = not available
	ports 6 - 8	= sync
>5	ports 1 - 5 = async
	ports 6 - 8	= sync

*"sync" = subrate port set for synchronous operation "async" = subrate port set for asynchronous operation

Subrate Port Channel Assignment

Asynchronous subrate ports require an individual channel assignment for each port, however, up to five synchronous subrate ports can be packed in one T1/E1 channel using DS0B subrate multiplexing. Based on hardware considerations at the T1/E1 Interface Card, sync ports 1 - 5 and 6 - 8 would be packed in pre-assigned DS0B "sub-channels" as shown below.

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