After the configuration files are downloaded to the boards, the links are aligned (brought up through layer 2). When MTP layer 2 achieves link alignment, MTP layer 3 brings the links into service through an exchange of signaling link test messages (SLTMs) with its peer MTP 3 on the other board. When this signaling link test successfully completes, each board generates a message indicating that the link is up (in service). The following example shows a typical txalarm message sequence for successful link startup:
<06/04/08 11:04:40> mtp 1 16387 Flushing Buffers (OutPktCnt=0) (Lnk 0)
<06/04/08 11:04:40> mtp 1 16387 Starting Alignment (Lnk 0)
<06/04/08 11:04:40> mtp 1 16387 Sent SIO (Lnk 0)
<06/04/08 11:04:39> mtp 2 16387 Flushing Buffers (OutPktCnt=0) (Lnk 0)
<06/04/08 11:04:39> mtp 2 16387 Starting Alignment (Lnk 0)
<06/04/08 11:04:39> mtp 2 16387 Sent SIO (Lnk 0)
<06/04/08 11:04:42> mtp 1 16387 Rcvd SIO (Lnk 0)
<06/04/08 11:04:42> mtp 1 16387 Sent SIE (Lnk 0)
<06/04/08 11:04:42> mtp 1 16387 Rcvd SIO (Lnk 0)
<06/04/08 11:04:41> mtp 2 16387 Rcvd SIE (Lnk 0)
<06/04/08 11:04:41> mtp 2 16387 Sent SIE (Lnk 0)
<06/04/08 11:04:42> mtp 1 16387 Rcvd SIE (Lnk 0)
<06/04/08 11:04:42> mtp 2 16387 Timer 4 Expired (LINK 0 ALIGNED at layer 2)
<06/04/08 11:04:42> mtp 1 16387 Discarding Signal Unit (Lnk 0), accept flag is off
<06/04/08 11:04:42> mtp 1 16387 Discarding Signal Unit (Lnk 0), accept flag is off
<06/04/08 11:04:43> mtp 1 16387 Timer 4 Expired (LINK 0 ALIGNED at layer 2)
<06/04/08 11:04:43> mtp 1 18229 MTP3 Resume for DPC 1.1.2 (0x10102), OPC 1.1.1 (0x10101)
<06/04/08 11:04:43> mtp 1 16387 Setting link 0 ACTIVE from SLTA
<06/04/08 11:04:43> mtp 1 18179 MTP3 Link 0 Up
<06/04/08 11:04:42> mtp 2 18229 MTP3 Resume for DPC 1.1.1 (0x10101), OPC 1.1.2 (0x10102)
<06/04/08 11:04:42> mtp 2 16387 Setting link 0 ACTIVE from SLTA
<06/04/08 11:04:42> mtp 2 18179 MTP3 Link 0 Up