Interface Configuration
7750 SR Interface Configuration Guide Page 81
Table 19 displays bits 5-8 of a K1 byte and K2 Bits 1-4 and the channel number code assignments.
K2 Byte
The K2 byte is used to indicate the bridging actions performed at the line-terminating equipment
(LTE), the provisioned architecture and mode of operation.
The bit assignment for the K2 byte is listed in Table 20.
Table 19: K1 Byte, Bits 5-8 (and K2 Bits 1-4), Channel Number Code Assignments
Channel Number
Code
Channel and Notes
0 Null channel.
SD and SF requests apply to conditions detected on the protection line.
For 1+1 systems, Forced and Request Switch requests apply to the
protection line.
Only code 0 is used with Lockout of Protection request.
1 — 14 Working channel.
Only code 1 applies in a 1+1 architecture.
Codes 1 through n apply in a 1:n architecture.
SD and SF conditions apply to the corresponding working lines.
15 Extra traffic channel.
May exist only when provisioned in a 1:n architecture.
Only No Request is used with code 15.
Table 20: K2 Byte Functions
Bits 1-8 Function
1 — 4 Channel number. The 7750 SR supports only values of 0 and 1.
5 0 Provisioned for 1+1 mode.
1 Provisioned for 1:n mode.
6-8 111 Line AIS
110 Line RDI
101 Provisioned for bi-directional switching
100 Provisioned for uni-directional switching
011 (reserved for future use)
010 (reserved for future use)
001 (reserved for future use)
000 (reserved for future use)
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