Nortel Networks 553-3901-200 instruction manual Clock recovery, Clock reference cable connection

Install ISDN BRI hardware Page 41 of 46

Figure 11

Clock reference cable connection

NTND71AA - AD

NTND70AA

IPE I/O panel

S

I

L

C

IPE shelf

CE I/O panel

C

C

CE shelf

NTND72AA

553-7702

Clock recovery

The SILC is configured in the slave-slave mode when acting as a trunk interface. This is set up through the Maintenance Signaling Channel (MSC). The microcontroller configures the S/T chips on the SILC as appropriate.

The SILC may recover the network clock from the received data stream using on-chip phase lock loops. The clock frequency which is recovered is 2.56 MHz. The jitter and wander conform to CCITT recommendations.

ISDN Basic Rate Interface Installation