A communications panel comprising: a chassis including first and second sidewalls extending between a base and a cover and extending between an open front and a rear , the first sidewall defining an aperture ; a spool arrangement disposed within the interior of the chassis , the spool arrangement including: a tray , a spool rotatably disposed on the tray , a spool locking arrangement including a lock bar aligned with the aperture of the first sidewall of the chassis when the spool arrangement is disposed in the chassis , the lock bar configured to slide between a retracted position in which the spool is free to rotate within the chassis and an extended position in which the spool cannot rotate, the lock bar being biased to the extended position in which the lock bar extends through the aperture , wherein the lock bar is removed from the aperture when disposed in the retracted position, and an adapter arrangement disposed on the spool , characterized in that the adapter arrangement is configured to slide relative to the spool between a connection position and a payout position, such that the lock bar is retracted when the adapter arrangement is slid to the payout position, and such that the lock bar is extended into the aperture when the adapter arrangement is slid to the connection position. a chassis including first and second sidewalls extending between a base and a cover and extending between an open front and a rear , the first sidewall defining an aperture ; a spool arrangement disposed within the interior of the chassis , the spool arrangement including: a tray , a spool rotatably disposed on the tray , a spool locking arrangement including a lock bar aligned with the aperture of the first sidewall of the chassis when the spool arrangement is disposed in the chassis , the lock bar configured to slide between a retracted position in which the spool is free to rotate within the chassis and an extended position in which the spool cannot rotate, the lock bar being biased to the extended position in which the lock bar extends through the aperture , wherein the lock bar is removed from the aperture when disposed in the retracted position, and an adapter arrangement disposed on the spool , characterized in that the adapter arrangement is configured to slide relative to the spool between a connection position and a payout position, such that the lock bar is retracted when the adapter arrangement is slid to the payout position, and such that the lock bar is extended into the aperture when the adapter arrangement is slid to the connection position. a tray , a spool rotatably disposed on the tray , a spool locking arrangement including a lock bar aligned with the aperture of the first sidewall of the chassis when the spool arrangement is disposed in the chassis , the lock bar configured to slide between a retracted position in which the spool is free to rotate within the chassis and an extended position in which the spool cannot rotate, the lock bar being biased to the extended position in which the lock bar extends through the aperture , wherein the lock bar is removed from the aperture when disposed in the retracted position, and an adapter arrangement disposed on the spool , characterized in that the adapter arrangement is configured to slide relative to the spool between a connection position and a payout position, such that the lock bar is retracted when the adapter arrangement is slid to the payout position, and such that the lock bar is extended into the aperture when the adapter arrangement is slid to the connection position. <EOS>